@incollection{BergAntoshkivSteinbergetal., author = {Berg, Heinz Peter and Antoshkiv, Oleksiy and Steinberg, Peter and Sigmund, Ernst}, title = {Entwicklung von "Multifuel Power Unit (MFPU)" - Familien f{\"u}r die Anwendung in zuk{\"u}nftigen hybriden Gasfahrzeugen"}, language = {de} } @inproceedings{RabeBergSchifferetal., author = {Rabe, Guido and Berg, Heinz Peter and Schiffer, Heinz Peter and Benton, R.}, title = {Wechselwirkung zwischen Sekund{\"a}rstr{\"o}mung und "ballistischen" Plattformfilmk{\"u}hlung}, language = {de} } @incollection{AntoshkivBergSteinberg, author = {Antoshkiv, Oleksiy and Berg, Heinz Peter and Steinberg, Peter}, title = {Multifunktionale Kraft-W{\"a}rme-Kopplung in einer Fahrzeuganwendung (ACG) am Beispiel eines Traktors}, series = {W{\"a}rmemanagement des Kraftfahrzeugs, Bd. 6}, booktitle = {W{\"a}rmemanagement des Kraftfahrzeugs, Bd. 6}, publisher = {Expert-Verlag}, address = {Renningen}, isbn = {978-3-8169-2820-1}, pages = {242 -- 251}, language = {de} } @incollection{BergSteinberg, author = {Berg, Heinz Peter and Steinberg, Peter}, title = {Vielstofff{\"a}higer "Turbo-Range-Extender (TRE)": Ein technologischer Anstoß f{\"u}r die Elektromobilit{\"a}t der Zukunft}, language = {de} } @inproceedings{RabeBergSchifferetal., author = {Rabe, Guido and Berg, Heinz Peter and Schiffer, Heinz Peter and Benton, R.}, title = {Experimentelle Untersuchungen zur "ballistischen" Plattformk{\"u}hlung}, language = {de} } @techreport{AhlinderBergBiesold, author = {Ahlinder, Stefan and Berg, Heinz Peter and Biesold, Volker}, title = {EU Growth Project GRD1-1999-10602 "AEROHEX", Deliverable 17a : Report on the hot side flow investigation on the exhaust case of a recuperated industrial gas turbine}, abstract = {Bericht zu den Untersuchungen der Heissgas-Str{\"o}mung um den Abgasw{\"a}rmetauscher einer typischen kompakten Indusriegasturbine}, language = {en} } @inproceedings{RabeBergBenton, author = {Rabe, Guido and Berg, Heinz Peter and Benton, R.}, title = {Plattformk{\"u}hlung mit Anwendung der "ballistischen K{\"u}hlung" in unterschiedlichen Ausblasekonfigurationen}, abstract = {experimentelle und numerische Untersuchung eins neuartigen Filmk{\"u}hldesigns zur K{\"u}hlung der Plattform eines Hochdruckturbinenstators - die ballistische Plattform-Filmk{\"u}hlung}, language = {de} } @techreport{AhlinderBerg, author = {Ahlinder, Stefan and Berg, Heinz Peter}, title = {EU Growth Project GRD1-1999-10602 "CLEAN", Deliverable 20 : report on matrix orientation in the EEFAE-LSIP (CLEAN)}, abstract = {zweiter Teil des Reports 20, Darstellung der matrix-Ausrichtung im EEFAE-LSIP (CLEAN) Demonstator, Darstellen der CFD Untersuchungen zum Gas-Strom auf der heissen Seite im CLEAN Demonstrator. Der W{\"a}rmetauscher ist als Por{\"o}sit{\"a}tsmodell dargestellt.}, language = {en} } @inproceedings{FeilerBergHaselbach, author = {Feiler, Christoph and Berg, Heinz Peter and Haselbach, F.}, title = {Some aspects of flow and heat transfer measurements of a non-axisymmetrically countoured turbine endwall}, language = {en} } @inproceedings{WojczikPrinzlerBerg, author = {Wojczik, A. and Prinzler, Michael and Berg, Heinz Peter}, title = {Laseroptische Vermessung (PIV) verz{\"o}gerter \& aktiv beschleunigter Grenzschichten einer ebenen Turbinenlaufschaufelumstr{\"o}mung}, language = {de} } @incollection{AntoshkivBergHimmelberg, author = {Antoshkiv, Oleksiy and Berg, Heinz Peter and Himmelberg, Axel}, title = {Optimierung der Z{\"u}ndkerzenposition in einem Wankelmotor, Motorische Verbrennung}, language = {de} } @article{AntoshkivBergWagner, author = {Antoshkiv, Oleksiy and Berg, Heinz Peter and Wagner, R.}, title = {Untersuchungen des ottomotorischen Betriebs mit verschiedenen Kraftstoffmischungen}, language = {de} } @inproceedings{PoojitganontBergIzweiketal., author = {Poojitganont, Thanapol and Berg, Heinz Peter and Izweik, Husni Taher and Himmelberg, Axel}, title = {Wankel Rotary Engine for Small Aircrafts and UAVs Applications: The Simulation for Chamber Design Development}, language = {en} } @inproceedings{BergIzweikPoojitganontetal., author = {Berg, Heinz Peter and Izweik, Husni Taher and Poojitganont, Thanapol and Antoshkiv, Oleksiy}, title = {Anwendung fortschrittlicher Simulationswerkzeuge in der Wankelmotorenentwicklung}, language = {de} } @incollection{SchumeykoAntoshkivPuillandreetal., author = {Schumeyko, Y. and Antoshkiv, Oleksiy and Puillandre, Y. and Berg, Heinz Peter}, title = {Simulation eines Motorwarmlaufs im neuen europ{\"a}ischen Fahrzyklus (NEFZ)}, series = {W{\"a}rmemanagement des Kraftfahrzeugs V}, booktitle = {W{\"a}rmemanagement des Kraftfahrzeugs V}, editor = {Steinberg, Peter}, publisher = {Expert-Verlag}, address = {Renningen}, isbn = {978-3-8169-2651-1}, pages = {28 -- 37}, language = {de} } @article{PloesserAntoshkivBergetal., author = {Ploesser, Joerg and Antoshkiv, Oleksiy and Berg, Heinz Peter and Schluchter, Wolfgang}, title = {Optimierung des En-O-Trak-Systems}, language = {de} } @inproceedings{AntoshkivMykhalyukBerg, author = {Antoshkiv, Oleksiy and Mykhalyuk, Maryan and Berg, Heinz Peter}, title = {Development of turbocharger system for wankel engine working on diesel cycle}, language = {en} } @inproceedings{Berg, author = {Berg, Heinz Peter}, title = {Entwicklung eines neuartigen, vielstofff{\"a}higen Range-Extenders f{\"u}r zuk{\"u}nftige Elektrofahrzeuge}, language = {de} } @inproceedings{AntoshkivBerg, author = {Antoshkiv, Oleksiy and Berg, Heinz Peter}, title = {Modern aero-engine combustor flame stabilization using cone bodies}, series = {New beginnings, CEAS 2009 European Air and Space Conference, 26 - 29 October 2009, Manchester, UK, post-conference DVD}, booktitle = {New beginnings, CEAS 2009 European Air and Space Conference, 26 - 29 October 2009, Manchester, UK, post-conference DVD}, publisher = {Royal Aeronautical Society}, address = {London}, isbn = {1-85768-213-0}, language = {en} } @inproceedings{AntoshkivMykhalyukBerg, author = {Antoshkiv, Oleksiy and Mykhalyuk, Maryan and Berg, Heinz Peter}, title = {BOOST-Modeling of Turbo-Charging in the Wankel Engine working on Diesel Cycle}, language = {en} } @inproceedings{AntoshkivBakeBerg, author = {Antoshkiv, Oleksiy and Bake, S. and Berg, Heinz Peter}, title = {Spray-Airflow Interaction in a Modern Gas Turbine Combustion Chamber}, language = {en} } @inproceedings{AntoshkivBakeBerg, author = {Antoshkiv, Oleksiy and Bake, S. and Berg, Heinz Peter}, title = {Spray Phenomena and their Influence on the Ignition Performance of a Modern Aeroengine Combustor}, language = {en} } @techreport{AhlinderBerg, author = {Ahlinder, Stefan and Berg, Heinz Peter}, title = {EU Growth Project GRD1-1999-10602 "AEROHEX"}, abstract = {Deliverable 20b, Report on the matrix orientation in the EEFAE-LSIP (CLEAN) demonstrator, CFD analysis}, language = {en} } @inproceedings{FeilerBerg, author = {Feiler, Christoph and Berg, Heinz Peter}, title = {Aerothermale Auslegungsvalidierung von Plattformkonfigurationen mittels Experiment und numerischer Verfahren}, series = {Motto: 100 Jahre Motorflug - 112 Jahre Menschenflug: Visionen gestalten Zukunft, Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 3}, booktitle = {Motto: 100 Jahre Motorflug - 112 Jahre Menschenflug: Visionen gestalten Zukunft, Deutscher Luft- und Raumfahrtkongress 2003, M{\"u}nchen, 17. bis 20. November 2003, Bd. 3}, publisher = {DGLR}, address = {Bonn}, pages = {1933 -- 1950}, language = {de} } @article{ChenKeilBerg, author = {Chen, X. and Keil, M. and Berg, Heinz Peter}, title = {Flexible dynamische Messdatenerfassung in der Verbrennungs-motoren- und Kleingasturbinenerprobung}, language = {de} } @inproceedings{BergReichelNeumannetal., author = {Berg, Heinz Peter and Reichel, Yves and Neumann, Martin and Antoshkiv, Oleksiy}, title = {Turbo Range Extenders - Recuperative Micro Gas Turbines as an Alternativ Concept of Energy Conversion in Plug-In Hybrid Vehicles}, series = {Automotive and engine technology, 11th Stuttgart International Symposium, 22 and 23 February 2011, Stuttgart, Germany, Vol. 1}, booktitle = {Automotive and engine technology, 11th Stuttgart International Symposium, 22 and 23 February 2011, Stuttgart, Germany, Vol. 1}, publisher = {ATZlive}, address = {Wiesbaden}, isbn = {978-3-8348-1561-3}, pages = {95 -- 110}, language = {en} } @inproceedings{AntoshkivBakeBagchietal., author = {Antoshkiv, Oleksiy and Bake, Sebastian and Bagchi, Imon and Berg, Heinz Peter}, title = {Ignition Performance Improvement in a Modern Gas Turbine Combustor}, series = {XX. International Symposium on Air Breathing Engines 2011, ISABE 2011}, booktitle = {XX. International Symposium on Air Breathing Engines 2011, ISABE 2011}, publisher = {American Institute of Aeronautics and Astronautics}, address = {Reston, VA}, isbn = {978-1-61839-180-3}, pages = {217 -- 225}, language = {en} } @inproceedings{BergKrienke, author = {Berg, Heinz Peter and Krienke, Christian}, title = {Mikrogasturbinen-SOFC-Prozesse mit hohem Wirkungsgradpotential}, series = {12. Magdeburger Maschinenbautage, 30. September und 1. Oktober 2015}, booktitle = {12. Magdeburger Maschinenbautage, 30. September und 1. Oktober 2015}, publisher = {Otto-von-Guericke Universit{\"a}t Magdeburg}, address = {Magdeburg}, abstract = {Schwerpunkt des Beitrages ist die Entwicklung und Applikation eines alternativen Energieumwandlungskonzeptes. Dieses basiert auf einer kompakten vielstofff{\"a}higen Mikrogasturbinen (MGT)- Technologie, welche {\"u}ber einen internen W{\"a}rmetausch einen hohen Wirkungsgrad erm{\"o}glicht und durch eine weitere Prozesshybridisierung (durch eine eingebettete SOFC) den „Energiewandler der Zukunft" darstellt. Es wird die luftgelagerte MGT-Generator-Basistechnologie beschrieben, der darauf aufgebaute MGT-SOFCHybrid-Prozess simuliert, eine kompakte Abwandlung mit integriertem Generator dargestellt und der Familiengedanke aufgegriffen. Die Konzepte basieren auf einer Luftlagertechnologie in Verbindung mit einem direkt von der Turbomaschine angetriebenen Generator und einem Rekuperator, welcher die Abgasw{\"a}rme wieder in den Prozess zur{\"u}ckf{\"u}hrt. Sie liefern die notwendige Grundlage f{\"u}r einen hoch effektiven, reinen Mikrogasturbinenprozess (MGT-Prozess) und den „MGT-SOFC-Hochwirkungsgrad-Prozess". Neben der luftgelagerten Mikrogasturbinen-Generatorbauart, stellt insbesondere die SOFC eine wichtige Schl{\"u}sseltechnologie dar. Der Begriff SOFC steht f{\"u}r „Solid Oxide Fuel Cell" (Festoxid-Brennstoffzelle). Dieser Brennstoffzellentyp arbeitet bei einer sehr hohen Temperatur (700 °C bis 1000 °C) und erlangt einen sehr hohen Wirkungsgrad, wenn man die Verlustw{\"a}rme und den nicht konvertierten Brennstoff durch eine geschickte Integration mit dem MGT-Prozess weiter verwertet. Um den maximal m{\"o}glichen Wirkungsgrad der hybriden Bauweise aufzuzeigen, wird zun{\"a}chst der idealisierte W{\"a}rmekraftmaschinen-Brennstoffzellen-Prozess dargestellt. Danach wird die zum gegenw{\"a}rtigen Zeitpunkt vorhandene Basistechnologie beschrieben und verschiedene, darauf beruhende reale Prozesse f{\"u}r die Verstromung von Methan (Erdgas) simuliert. Hierbei werden die hohen Wirkungsgradpotentiale (elektrisch) dieser realen Prozesse (bis ca. 80 \%) aufgezeigt. Der Beitrag endet mit der kurzen Darstellung einer Energiewandlerfamilie im Bereich 20 KW bis 0,8 MW (zuk{\"u}nftig bis 2,3 MW) und einem Ausblick auf den neuen Markt der Zukunft, sowie mit einer Empfehlung zum Aufbau eines interdisziplin{\"a}ren Forschungsnetzwerkes.}, language = {de} } @inproceedings{PoojitganontBergKingkoetal., author = {Poojitganont, Thanapol and Berg, Heinz Peter and Kingko, Chirdchai and Bun-Athuek, Natthaphon and Watjatrakul, Boonchai}, title = {One-Dimensional Thermodynamic Cycle Analysis of Micro Gas Turbine (MGT) for Small Power Plant}, series = {The International Conference on Science and Technology, 2015}, booktitle = {The International Conference on Science and Technology, 2015}, publisher = {IEEE}, address = {New York}, doi = {10.1109/TICST.2015.7369342}, pages = {64 -- 69}, abstract = {The energy demands worldwide and especially in developing countries are significantly increased, whereas the numbers of electricity supply are not enlarged at Together with the decentralized ideal of the forthcoming power plants, the 100kW micro gas turbine (MGT) could be one of the solutions for the future. Based on the multi development project for small power plants, the 1D simulation of the overall system with MATLAB has been performed to utilize as an analysis tool for optimizing the thermodynamic cycle of the system. At the beginning the code has been validated with the commercial program for power plant simulation, called EBSILON Professional. The result shows that they are compatible in the same direction. The next part illustrates the comparing result of the efficiency on the whole system, when turbine inlet temperature has changed. The results show that higher turbine inlet temperature provides also higher global efficiency. However, the minimum efficiencies, which are obtained on each specific turbine inlet temperature, are not corresponded at the same pressure ratio. In the latter section, the effect of fuel types is also considered on the output efficiency. The results show that to maintain the output efficiency on each fixed turbine inlet temperature the fuel mass flow rate has to be increased in reciprocal to their lower heating values. However, in the lower range of their mass flow rate the increment of efficiency is not proportional to the addition of fuel.}, language = {en} } @misc{BergHimmelbergLehmannetal., author = {Berg, Heinz Peter and Himmelberg, Axel and Lehmann, Mario and D{\"u}ckershoff, Roland and Neumann, Mathias}, title = {The Turbo-Fuel-Cell 1.0 - family concept - Compact Micro Gas Turbine (MGT) - Solid Oxide Fuel Cell (SOFC) energy converters in the 100 - 500 kW electrical power range for the future}, series = {IOP conference series : Materials Science and Engineering}, volume = {297}, journal = {IOP conference series : Materials Science and Engineering}, issn = {1757-899X}, doi = {doi:10.1088/1757-899X/297/1/012004}, pages = {15}, abstract = {The "Turbo-Fuel-Cell-Technology" has been described as a MGT-SOFC hybrid system consisting of a recuperated micro gas turbine (MGT) process with an embedded solid oxide fuel cell (SOFC) subsystem. SOFC stacks are connected to "SOFC stack grapes" and are equipped with the so called HEXAR-Module. This module is composed of a high-temperature heat exchanger (HEX), an afterburner (A) and a steam reformer (R). The MGT-concept is based on a generator driven directly by the turbomachine and a recuperator, which returns the exhaust heat to the pressurized compressor outlet air. This provides the necessary base for a highly effective, pure MGT process and the "MGT-SOFC-high-efficiency process". This paper describes the concept and the thermodynamic background of a highly effective and compact design of the "Turbo-Fuel-Cell 1.0-Family" in the electrical performance class from 100 to 500kW. The technological state of the system is shown and a rating of the system with comparative parameters is discussed. It becomes visible that all necessary basic technologies should be available and that the technology (for stationary applications) can have the "entry into services (E.I.S.)" in the next 10 years. The MGT-SOFC performance map under different operation conditions is discussed. This article also provides an overview of the research on MGT-SOFC-Systems and the scenario of an energy supply network and a mobile energy conversion of the future introduction.}, language = {en} } @misc{AntoshkivPoojitganontJeansirisomboonetal., author = {Antoshkiv, Oleksiy and Poojitganont, Thanapol and Jeansirisomboon, Settapak and Berg, Heinz Peter}, title = {Ignition improvement by injector arrangement in a multi-fuel combustor for micro gas turbine}, series = {IOP conference series : Materials Science and Engineering}, volume = {297}, journal = {IOP conference series : Materials Science and Engineering}, issn = {1757-899X}, doi = {10.1088/1757-899X/297/1/012006}, pages = {12}, abstract = {The novel combustor design also has an impact on the ignitor arrangement. The conventional ignitor system cannot guarantee optimal ignition performance in the usual radial position. The difficult ignitability of gaseous fuels was the main challenge for the ignitor system improvement. One way to improve the ignition performance significantly is a torch ignitor system in which the gaseous fuel is directly mixed with a large amount of the combustor air. To reach this goal, the ignition process was investigated in detail. The micro gas turbine (MGT) ignition was optimised considering three main procedures: torch ignitor operation, burner ignition and flame propagation between the neighbour injectors. A successful final result of the chain of ignition procedures depends on multiple aspects of the combustor design. Performed development work shows an important step towards designing modern high-efficiency lowemission combustors.}, language = {en} } @misc{BergKleisslHimmelbergetal., author = {Berg, Heinz Peter and Kleissl, Marko and Himmelberg, Axel and Lehmann, Mario and Prechavut, Nontavut and Vorpahl, Michael}, title = {Heat balancing of direct reforming fuel cells in MGT-SOFC hybrid systems}, series = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, journal = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, editor = {Prukvilailert, Monchai}, edition = {1. Auflage}, publisher = {IOP Publishing/IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/501/1/012007}, pages = {50 -- 60}, abstract = {Solid oxide fuel cells convert chemical energy in electrical energy and are highly suitable for the conversion of hydrocarbon based fuels and products from PowerToGas conversions. Embedded in a micro gas turbine-cycle instead of the combustion chamber the heat energy of the injected fuel, released in the SOFC-Stack, can additionally converted into work and by a turbine-generator into electricity. In a compact system, SOFC stacks are designed to realize a direct steam-reforming process inside. In such direct-reforming fuel cell systems the SOFC operating temperature due to the heat demand for reforming, can be reduced to a value in the range of the outlet temperature of the downstream flow (650°C). If the cycle uses a recuperating system, the operating conditions of the SOFC can be realized without additional high-temperature heat exchanger systems. The system with an uncooled turbine, described in [1], just can reach the operating temperature with an additional high-temperature heat exchange. The system described in this publication does not require an additional high-temperature heat exchanger, because the X-value, as the ratio between the exchanged heat quantity and the required amount of heat to complete the MGT-cycle [2] due to the referring process, is nearly zero and can be realized via the inner container wall (of the MLC). The cycle is completed (between the SOFC and the turbine entry) by the heat input of an afterburner. Here the unreacted fuel of the SOFC fuel-stream is used to provide the necessary heat energy for the downstream turbo-generator-system.}, language = {en} } @misc{PoojitganontSinchaiWatjatrakuletal., author = {Poojitganont, Thanapol and Sinchai, J. and Watjatrakul, Boonchai and Berg, Heinz Peter}, title = {Numerical Investigation of In-chamber Flow inside a Wankel Rotary Engine}, series = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, journal = {9th Thai Society of Mechanical Engineers, International Conference on Mechanical Engineering (TSME-ICoME 2018) 11-14 December 2018, Phuket, Thailand}, editor = {Prukvilailert, Monchai}, edition = {1. Auflage}, publisher = {IOP Publishing/IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/501/1/012043}, pages = {326 -- 333}, abstract = {In this paper the in-house technique mesh moving function based on AVL-FIRE has been developed as a simulation tool to investigate the in-chamber flow phenomena of the Wankel rotary engine. The meshes from the starting rotor position at 165° BTDC until the ending rotor position at top dead center (TDC) have been created and connected together. The numerical simulations between an intake stroke and the end of a compression stroke have been successively performed. The results are validated with the selected publication on various engine speeds, at 675 rpm and 1170 rpm. In parallel three refinements of meshes have been carried out, in order to optimize the suitable meshes' elements for the calculation of this engine type. In addition, the turbulence models, which are standard k-ε and Large Eddy Simulations (LES), have been varied for detailed investigation of their predictive capabilities. The simulation results show that the flow phenomena are well corresponding to the experimental data in both engine speeds, especially with the LES. It could be also identified that the LES model performs better on predicting the flow field both in directions and characteristics. Moreover, there is no evidently difference on the results between the medium (c.a. 100,000 elements) and fine (c.a. 1,000,000 elements) meshes comparing to the experimental results.}, language = {en} } @misc{DueckershoffBergHimmelbergetal., author = {D{\"u}ckershoff, Roland and Berg, Heinz Peter and Himmelberg, Axel and Lehmann, Mario and Kleissl, Marko}, title = {Influence on the Electrical Efficiency of a Hybrid MGT-SOFC-System by μ-fogging in a-Two-Staged Compressor System}, series = {IOP Conference Series: Materials Science and Engineering}, journal = {IOP Conference Series: Materials Science and Engineering}, editor = {Ashton, Anete}, edition = {1. Auflage}, publisher = {IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/886/1/012041}, pages = {1 -- 8}, abstract = {Hybrid combinations of solid oxide fuel cell and recuperated micro gas turbines can convert the chemical energy of hydrocarbon-based fuels in electrical energy with high electrical efficiency. With an integrated and improved cycle management, more than 70\% of the energy content of the fuel could be converted. Therefore, the systems are highly suitable for the Power-To-Gas conversion. In particular, a pressure charging of the SOFC fuel cell leads to an increase in stack performance. By a downstream turbo set, after residual fuels are intentionally oxidized with an afterburner, additional electrical energy can be gained from the expansion of the hot exhaust gas stream and the overall efficiency can be increased. In order to increase the electrical efficiency of the system, it is proposed, to ensure the required compression of the process air in particular by a-two-staged turbo compressor with an intermediate cooling system. By thus achievable reduction of the dissipation of the compressor and by targeted condensation of finest drops in front of the second compressor stage affected by intermediate cooling, an increase in efficiency of the system is possible. This is achieved by targeted cooling of the process air behind a low pressure compression, so that it is saturated over 100\% relative air humidity. As a result, a slightly supersaturated airflow is available for the second compressor stage, which enters the compressor after heat removal via an intermediate cooling having a small number of microdroplets. Therefore, the condensed water evaporates again by the heat of compression in the second stage and the compressed flow ultimately enters the recuperation at a lower temperature than during normal compression. Thus, more heat can be recovered within the recuperation system. Therefore, the electrical energy of the system can be produced having higher efficiency, because the heat dissipation of the overall system decreases. In this article it is presented, how such a process is thermodynamically modelled and how a technical realization can be built after optimization by simulations. Finally, in this study, the process-influencing factors are analyzed to show the highest possible electrical yield of such a system.}, language = {en} } @inproceedings{BergAntoshkivHimmelbergetal., author = {Berg, Heinz Peter and Antoshkiv, Oleksiy and Himmelberg, Axel and Izweik, Husni Taher and Poojitganont, Thanapol}, title = {Brennverfahrensentwicklung f{\"u}r eine neuartige Kreiskolbenmotorenfamilie, Wankelmotorenentwicklung}, language = {de} } @inproceedings{BergDueckershoffLehmannetal., author = {Berg, Heinz Peter and D{\"u}ckershoff, Roland and Lehmann, Mario and Prechavut, Nontavut}, title = {Micro Turbo-Fuel-Cell-Technology : Hybrid compact turbo machinery technology and thermodynamic aspects regarding design parameters of a high efficient MGT-SOFC-system}, series = {12th European Conference on Turbomachinery Fluid dynamics \& Thermodynamics}, booktitle = {12th European Conference on Turbomachinery Fluid dynamics \& Thermodynamics}, doi = {10.29008/ETC2017-266}, pages = {1 -- 12}, abstract = {The improvement of decentralised energy supply systems has received an important role in the recent years. One option is the combination of SOFC with recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68\%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented.}, language = {en} } @inproceedings{BergDueckershoffLehmannetal., author = {Berg, Peter and D{\"u}ckershoff, Roland and Lehmann, Mario and Prechavut, Nontavut}, title = {Micro Turbo-Fuel-Cell-Technology: Hybrid compact turbo machinery technology and thermodynamic aspects regarding design parameters of a high efficient MGT-SOFC-system}, series = {Proceedings of 12th European Conference on Turbomachinery Fluid dynamics \& Thermodynamics, ETC12, April 3 - 7, 2017, Stockholm, Sweden}, booktitle = {Proceedings of 12th European Conference on Turbomachinery Fluid dynamics \& Thermodynamics, ETC12, April 3 - 7, 2017, Stockholm, Sweden}, abstract = {The improvement of decentralised energy supply systems has received an important role in the recent years. One option therefore is the combination of SOFC with a recuperated MGT. Here, a new strategy for selecting the system parameters, such as the operating temperature of the SOFC, the turbine inlet temperature and the pressure ratio of the hybrid system, is presented. By introducing the heat ratio between the heat required to increase the process gas to the SOFC operating temperature and the heat required to raise the SOCF exhaust gas to the TIT, it was found that high efficiency (approx. 68\%) is realisable in a compact hybrid system today. Analysis also shows that the HEX-technology is needed to improve the system effectiveness. Also, high recirculation rates with lower TIT can be considered as the future development direction. In addition, a sample configuration of an oil-free MGT rotor unit with high speed foil bearings is presented.}, language = {en} } @misc{MatriscianoPasternakWangetal., author = {Matrisciano, Andrea and Pasternak, Michal and Wang, Xiaoxiao and Antoshkiv, Oleksiy and Mauß, Fabian and Berg, Peter}, title = {On the Performance of Biodiesel Blends - Experimental Data and Simulations Using a Stochastic Fuel Test Bench}, series = {SAE Technical Papers}, journal = {SAE Technical Papers}, number = {2014-01-1115}, issn = {0148-7191}, doi = {10.4271/2014-01-1115}, pages = {1 -- 8}, language = {en} } @inproceedings{BergHimmelbergMalenkyetal., author = {Berg, Peter and Himmelberg, Axel and Malenky, Uwe and Meincke, Marie and Soontornpasatch, Tosaporns}, title = {Hybrides Turbo Compound Fan Triebwerk}, series = {Deutscher Luft- und Raumfahrtkongress 2016, Braunschweig}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2016, Braunschweig}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V}, address = {Bonn}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-201610075510}, abstract = {Der Weg zum elektrischen Fliegen ist abh{\"a}ngig von der Entwicklung hochleistungsf{\"a}higer, kompakter und vor allem leichter Energiespeicher. Als mittelfristige, umweltschonende {\"U}bergangl{\"o}sung bieten sich, insbesondere f{\"u}r Flugtriebwerke mittlerer Leistungsklassen, Hybridsysteme aus Turbo-Compound-Kreiskolbenmotoren und Elektromaschinen f{\"u}r die Start- und Steigphasen an. Vorgestellt werden auf dem HSD-Konzept (HSD=Hybrid Super-Drive, vgl. [1]) beruhende luftfahrtechnische Anwendungen f{\"u}r unterschiedliche parallelhybride Flugantriebe. Die Basistechnologie st{\"u}tzt sich auf eine in der Produktion befindliche, vielstofff{\"a}hige Wankeltriebwerksfamilie. Das HSD-Konzept legt hierbei ein Kammervolumen von 650ccm zu Grunde. Der Leistungsbereich (0,8 bis 1,36MW) wird mit einem innovativen elektrischen parallel-hybriden Turbo-Compound-Konzept abgedeckt. Hierbei kommt zur Aufladung der Kreiskolben-Verbrennungsmaschine eine neuartige luftgelagerte Turbomaschine mit integrierter E-Maschine zum Einsatz. Als Vortriebstechnologie tr{\"a}gt das Counter-Rotating-Fan (CRF)-Konzept, welches am Beispiel eines Flugzeugtechnologietr{\"a}gers (Light-Jet) dargestellt wird, zur weiteren Steigerung der Wirtschaftlichkeit des Gesamtsystems bei. Der vorliegende Artikel basiert auf den in [1] beschrieben Grundlagen und stellt eine weiterf{\"u}hrende Diskussion im Rahmen des DLRK dar.}, language = {de} } @misc{RabeDueckershoffBerg, author = {Rabe, Guido and D{\"u}ckershoff, Roland and Berg, Heinz Peter}, title = {Ein Beitrag zur Schadstoffreduzierung zuk{\"u}nftiger Gasturbinen durch moderne K{\"u}hlverfahren}, language = {de} } @misc{DueckershoffBiesoldBerg, author = {D{\"u}ckershoff, Roland and Biesold, Volker and Berg, Heinz Peter}, title = {Einsatz der Laser Patricle Image Velocimetry und der Ammoniak-Diazo-Messtechnik bei der Entwicklung moderner Hochdruckturbinen mit lokalem Druckaufbau und zeitlich begrenzter Str{\"o}mungsabl{\"o}sung}, language = {de} } @inproceedings{FeilerBerg, author = {Feiler, Christoph and Berg, Heinz Peter}, title = {Str{\"o}mungsfeldvermessung und W{\"a}rme{\"u}bergangsmessung an Reynolds-{\"a}hnlichen Turbinenkaskaden}, series = {Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 3}, booktitle = {Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 3}, publisher = {DGLR}, address = {Bonn}, pages = {1821 -- 1831}, language = {de} } @inproceedings{BergAntoshkivChenetal., author = {Berg, Heinz Peter and Antoshkiv, Oleksiy and Chen, X.-M. and Liu, F.}, title = {Einsatz von neuartigen Entwicklungswerkzeugen bei der Brennraumgestaltung von Flugmotoren}, series = {Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 2}, booktitle = {Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 2}, publisher = {DGLR}, address = {Bonn}, pages = {1499 -- 1506}, language = {de} } @article{ChenLiuBerg, author = {Chen, X.-M. and Liu, Fushui and Berg, Heinz Peter}, title = {Untersuchung der Zylinderinnenstr{\"o}mung an einen BDE - Motor mittels Laser - PIV}, language = {de} } @article{ChenBergKeil, author = {Chen, X. and Berg, Heinz Peter and Keil, M.}, title = {Flexible dynamische Messdatenerfassung an einem Motorpr{\"u}fstand}, language = {de} } @inproceedings{AhlinderBergReile, author = {Ahlinder, Stefan and Berg, Heinz Peter and Reile, E.}, title = {Modelling of compact tube bundle heat exchanger as porous medium using Reynold´s anallgy}, abstract = {Numerische Untersuchung der Str{\"o}mung und der W{\"a}rme{\"u}bertragung in einem kompakten Rohrb{\"u}ndel-W{\"a}rmetauscher, der als por{\"o}ses Medium modelliert ist.}, language = {en} } @inproceedings{AntoshkivKruegerSarradjetal., author = {Antoshkiv, Oleksiy and Kr{\"u}ger, Falko and Sarradj, Ennes and Berg, Heinz Peter}, title = {Acoustical Diagnostic of Spray-Airflow Interaction in a Modern Aero Engine Combustor Chamber}, series = {Deutscher Luft- und Raumfahrtkongress 2009, Bd. Manuskripte}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2009, Bd. Manuskripte}, publisher = {DGLR}, address = {Bonn}, isbn = {978-3-932182-64-8}, language = {en} } @inproceedings{DueckershoffBiesoldBerg, author = {D{\"u}ckershoff, Roland and Biesold, Volker and Berg, Heinz Peter}, title = {Filmk{\"u}hlung bei verz{\"o}gerter Hauptstr{\"o}mung und lokaler Str{\"o}mungsabl{\"o}sung}, series = {Motto: Luft- und Raumfahrt - Made in Germany, Deutsche Technologie im internationalen Wettbewerb, Deutscher Luft- und Raumfahrtkongress 2001, Hamburg, 17. - 20. September 2001, Bd. 3}, booktitle = {Motto: Luft- und Raumfahrt - Made in Germany, Deutsche Technologie im internationalen Wettbewerb, Deutscher Luft- und Raumfahrtkongress 2001, Hamburg, 17. - 20. September 2001, Bd. 3}, publisher = {DGLR}, address = {Bonn}, pages = {1715 -- 1720}, language = {de} } @article{DueckershoffBiesoldBerg, author = {D{\"u}ckershoff, Roland and Biesold, Volker and Berg, Heinz Peter}, title = {Einsatz der Laser-Patricle-Image Velocimetry und der Ammoniak-Diazo-Messtechnik zur Untersuchung der Filmk{\"u}hlung zuk{\"u}nftiger Hochdruckturbinen}, language = {de} } @inproceedings{BergMalenkyAntoshkivetal., author = {Berg, Heinz Peter and Malenky, Uwe and Antoshkiv, Oleksiy and Mattke, Robert}, title = {Kompakte hocheffektive Mikrogasturbine mit integriertem Generator (MTIG): eine Komponente f{\"u}r die seriellen hybriden Antriebssysteme der Elektroflugzeuge von morgen}, series = {Deutscher Luft- und Raumfahrtkongress 2015 Rostock}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2015 Rostock}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V.}, address = {Bonn}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-20151109556}, pages = {9}, abstract = {Bei der Neugestaltung unserer zuk{\"u}nftigen Lebensr{\"a}ume sucht die Forschung nach neuartigen L{\"o}sungen f{\"u}r die bodengebundene Mobilit{\"a}t. Weiterhin spielt die Erforschung umweltvertr{\"a}glicher Antriebstechnologien f{\"u}r die Luftfahrt der Zukunft eine wichtige Rolle. Neben den rein elektrischen Antrieben stehen insbesondere fortschrittliche hybride Antriebssysteme im Vordergrund. Systeml{\"o}sungen werden kurz- bis mittelfristig f{\"u}r die unbemannten Flugzeuge und die allgemeine Luftfahrt ben{\"o}tigt. Es werden effiziente Flugantriebssysteme ben{\"o}tigt, die gegen{\"u}ber aktuellen Antriebssystemen deutlich weniger Schadstoffe emittieren und Brennstoff-ressourcen schonen. Dabei bietet der Elektroantrieb ein großes Potenzial. Aufgrund des derzeitig ung{\"u}nsti-gen Verh{\"a}ltnisses zwischen Gewicht und Energieinhalt bei Traktionsbatterien ist jedoch die rein elektrische Flugweise nur f{\"u}r einen sehr kleinen Anwendungsbereich interessant. Deshalb m{\"u}ssen Elektroluftfahrzeuge mit zus{\"a}tzlichen Energiewandlern und Speichern ausgestattet werden, um akzeptable Reichweiten und An-triebsleistungen bei moderaten Kosten zu gew{\"a}hrleisten. Als zukunftsf{\"a}higes Antriebskonzept wird u.a. das hybride elektrische Antriebssystem mit Kleinenergieerzeugern zur Reichweitenverl{\"a}ngerung angesehen. F{\"u}r den Einsatz als Range-Extender stehen unterschiedliche Konzepte zur Verf{\"u}gung, die eine Umwandlung von chemischer in elektrische Energie erm{\"o}glichen. Die Spezifikation eines Range-Extenders h{\"a}ngt dabei sehr stark von den Anforderungen an zuk{\"u}nftige Antriebskonzepte ab. Das bedeutet, dass Einbauraum, Gewicht, Kosten und Vielstofftauglichkeit eine neu zu definierende Gewichtung im Auswahlprozess des Energiewand-lers erhalten. Schwerpunkt des Beitrages ist die Entwicklung und Applikation eines alternativen Energieum-wandlungskonzeptes f{\"u}r E-Luftfahrzeuge traditioneller Bauweise (z.B. zur Verl{\"a}ngerung der Reichweite bei E-Kleinflugzeugen) und f{\"u}r innovative Luftfahrzeuge (als systemintegraler Bestandteil). Bei diesem Konzept handelt es sich um eine Mikrogasturbinen-Generator-Einheit, welche durch einen Rekuperator (W{\"a}rmetau-scher zur Abgasw{\"a}rmenutzung) einen hohen Wirkungsgrad erm{\"o}glicht und durch eine weitere Prozesshybri-disierung (z.B. mit eingebetteter SOFC) auch f{\"u}r nicht luftfahrttechnische Bereiche interessant ist. Es werden die Mikrogasturbinen-Generator (MTG)-Basistechnologie beschrieben und die Leistung, der Wirkungsgrad und die Vielstofff{\"a}higkeit diskutiert. Außerdem wird eine kompakte Abwandlung mit integriertem Generator (sogenannte MTiG) dargestellt. Weiterhin wird die Bedeutung der Mikrogasturbinenbauart f{\"u}r ein zuk{\"u}nftiges MTG/MTiG-SOFC-Hochwirkungsgradsystem erkl{\"a}rt und die hohe luftfahrttechnische Tauglichkeit der kom-pakten, rekuperierten MTiG-Mikrogasturbinentechnologie f{\"u}r die seriellen hybriden Flugtriebwerkssysteme aufgezeigt.}, language = {de} } @inproceedings{PrechavutBerg, author = {Prechavut, Nontavut and Berg, Heinz Peter}, title = {An Experimental Study on Structural Characteristics of Cantilever-Type Foil Bearings}, series = {Deutscher Luft- und Raumfahrtkongress 2015}, booktitle = {Deutscher Luft- und Raumfahrtkongress 2015}, publisher = {Deutsche Gesellschaft f{\"u}r Luft- und Raumfahrt - Lilienthal-Oberth e.V.}, address = {Bonn}, url = {http://nbn-resolving.de/urn:nbn:de:101:1-201511275091}, abstract = {Capable of high-speed and high-temperature operation, together with an "oil-free" technology concept, gas foil bearings are a perfect solution for a novel light weight (small scale) turbo machinery. While the gas film geometry and the pressure build-up are similar to other gas lubricated bearings, and as it has been well formulated in the hydrodynamic lubrication theory, the compliant structure of the foil bearings have a variety of forms and characteristics. The cantilever-type of foil bearings are one sort of foil bearings that uses a pattern of small cantilever beams as support structure which is very robust and eases the manufacturing process. The aim of this paper is to present a measurement method and results of structural stiffness and damping characteristics of exemplary 50 mm tree-lobes radial foil bearings. Static structural test result shows that the bearing has a wide range of linear stiffness in the bearing's center area. The ramp of cartridge inner surface contour causes a cross coupling effect which may cause instability by a large rotor orbit. Increasing in bear - ing preload result in slightly increasing in static stiffness. In dynamic excitation test, the result shows that the dynamic stiffness is about three times higher than the static one. With a simple model of dry friction, the result shows that the dry friction coefficient is in a range of 0.4 to 0.7. The result also shows that the dynamic stiffness is more sensitive to vibration amplitude than frequency. While the damping decreases significantly with exciting frequency, especially at the vicinity of the rigid body resonance. The result evidence that the magnitude of displacement has a great effect on damping. As displacement amplitude decreases, the bearing is better in damping.}, language = {en} } @misc{MardiKolurAntoshkivBerg, author = {Mardi Kolur, Mohsen and Antoshkiv, Oleksiy and Berg, Heinz Peter}, title = {Experimental analysis of the effect of nano-metals and novel organic additives on performance and emissions of a diesel engine}, series = {Fuel Processing Technology}, volume = {196}, journal = {Fuel Processing Technology}, issn = {0378-3820}, doi = {10.1016/j.fuproc.2019.106166}, pages = {1 -- 10}, abstract = {The present study focuses on performance and emission characteristics of three emulsion fuels with different additives on a single cylinder CI engine. Each of these emulsified fuels is distinctively engineered to be an alternative fuel for diesel engines. The test fuels are diesel, biodiesel, an emulsion fuel with 86\% biodiesel, 5\% DEE, 3\% Ethanol, 50 ppm CNT, 2\% Water, 2\% Tween 80 and 2\% Span 80 (BD.CNT.DEE.E), an emulsion fuel with 86\% biodiesel, 5\% EHN, 3\% Methanol, 50 ppm Al2O3, 2\% Water, 2\% Tween 80 and 2\% Span 80 (BD.ALO.EHN.M) and an emulsion fuel with 86\% biodiesel, 5\% Glycerine, 3\% Butanol, 50 ppm TiO2, 2\% Water, 2\% Tween 80 and 2\% Span 80 (BD.TIO.GLC.B). Experimental results revealed that BD.CNT.DEE.E has significant improvement compared to diesel and biodiesel in every aspect of performance such as enhanced brake power and brake thermal efficiency by 8.1\% and 4.5\%, respectively along with the most BSFC reduction by 4\%. It also shows exceptional reduction in all emissions compared to biodiesel by 26\%, 7.5\%, 9.2\% and 36\% in CO, UHC, NOx and smoke, respectively. BD.ALO.EHN.M also shows considerable improvement in performance including the highest brake thermal efficiency with 6\% increment and decline in all emissions except UHC, compared to biodiesel. Finally, BD.TIO.GLC.B shows a slight drop in performance with 6.6\% drop in brake thermal efficiency, but on the other hand it has the lowest smoke opacity by a plummet of 74.3\%, 20\% decline in CO and 10.7\% reduction in NOx compared to biodiesel. Therefore, it can be deducted that the emulsion fuels with the proper additives including oxygenated fuels, nano metals, stabilizers, cetane improvers and mixture emulsifiers could ensure clean and renewable alternatives for diesel engines.}, language = {de} } @misc{BergHimmelbergPoojitganont, author = {Berg, Heinz Peter and Himmelberg, Axel and Poojitganont, Thanapol}, title = {Hybrid Turbo Compound Fan Engine an Eco-Efficient Propulsion System for Aviation}, series = {Materials Science and Engineering : Thai Society of Mechanical Engineering, the 10th International Conference on Mechanical Engineering (TSME-ICOME2019) 10-13 December 2019, Pattaya, Thailand}, volume = {2020}, journal = {Materials Science and Engineering : Thai Society of Mechanical Engineering, the 10th International Conference on Mechanical Engineering (TSME-ICOME2019) 10-13 December 2019, Pattaya, Thailand}, edition = {1. Auflage}, publisher = {IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/886/1/012010}, pages = {12}, abstract = {The path to electric propulsion systems depends on the development of powerful, compact and very light energy storage system with a high storage density. In order to create an environment-friendly intermediate solution in the medium term, especially for aircraft engines of medium power classes, it makes sense to use an innovative, electrically parallel hybrid unit based on rotary engines and electric boosters for start and climb phases as a propulsion system. An aero-engine application, based on the HSD concept (HSD = hybrid super-drive - hybrid Wankel rotary engine) for different hybrid-parallel propulsion systems is presented. In this article, the introduced technology is based on a currently produced family of multi-component Wankel rotary engines. The proposed HSD concept uses a chamber volume of 650ccm per rotor. The projected power range (0.8 to 1.36 MW) is covered by an innovative hybrid electric parallel turbo compound concept together with 2x4 rotary engine units. A novel, airbearing turbo engine with integrated electric drive is used as a turbocharger for charging the rotary engine. For the aero-engine technology, the counter-rotating fan (CRF) concept shown as an example for an aircraft technolo¬gy carrier (light jet) leads to a further increase in the efficiency of a complete system.}, language = {en} } @misc{PoojitganontAntoshkivWatjatrakuletal., author = {Poojitganont, Thanapol and Antoshkiv, Oleksiy and Watjatrakul, Boonchai and Berg, Heinz Peter}, title = {Efficiency and Emission Simulations of Hydrogen-Fuel City Buses}, series = {IOP Conference Series: Materials Science and Engineering}, journal = {IOP Conference Series: Materials Science and Engineering}, editor = {Ashton, Anete}, edition = {1. Auflage}, publisher = {IOP Science}, address = {Bristol}, issn = {1757-899X}, doi = {10.1088/1757-899X/886/1/012025}, pages = {1 -- 8}, abstract = {In this study, the AVL Cruise is implemented to simulate driving parameters including the driving path, the power loss on engine accessories, the gear-shifting scheme and the engine's fuel cut-off strategy influencing the bus fuel efficiency and emission. The Mercedes Conecto LF city bus using a diesel engine with Standardised On-Road Test Cycles was firstly simulated and compared with available literature. The application of hydrogen fuel was then examined and its result was compared with the diesel fuel on the specific fuel consumption. In addition, the driving cycles in Bangkok were simulated. The results show the pattern on both driving cycles with different fuel are similar, however, the fuel consumption of H2 is significantly less than in the case of Diesel. Moreover, it is also evident that the SORT driving cycle cannot represent the heavy traffic of Bangkok.}, language = {en} } @incollection{BondarenkoBergAntoshkiv, author = {Bondarenko, Evgeniiy and Berg, Heinz Peter and Antoshkiv, Oleksiy}, title = {Untersuchung des Verbrauchs- und Rekuperationspotentials eines Elektrobusses mit Turbo-Range-Extender mittels AVL Cruise}, series = {W{\"a}rmemanagement des Kraftfahrzeugs IX}, booktitle = {W{\"a}rmemanagement des Kraftfahrzeugs IX}, editor = {Steinberg, Peter}, publisher = {expert Verlag}, address = {Potsdam}, isbn = {978-3-8169-3275-8}, pages = {341 -- 356}, language = {de} } @article{AhlinderBiesoldBerg, author = {Ahlinder, Stefan and Biesold, Volker and Berg, Heinz Peter}, title = {Hot side flow investigation on the exhaust case of a recuperated industrial gas turbine}, language = {en} } @inproceedings{PoojitganontIzweikBerg, author = {Poojitganont, Thanapol and Izweik, Husni Taher and Berg, Heinz Peter}, title = {"Simulation of Flow Field inside the Wankel Combustion Chamber"}, language = {en} } @misc{XieStarickMosgowetal., author = {Xie, Tianxiao and Starick, Tommy and Mosgow, Anatol and Berg, Heinz Peter and H{\"o}schler, Klaus and Schmidt, Heiko}, title = {Thermofluiddynamic pre-design of a primary surface heat exchanger under the influence of heat radiation using 1D/3D coupled simulation method}, series = {NAFEMS World Congress 2021, online, 25-29. Oktober 2021}, journal = {NAFEMS World Congress 2021, online, 25-29. Oktober 2021}, pages = {25}, abstract = {Within the Framework of the "TurboFuelCell (TFC)" a highly integrated and compact energy conversion system based on Micro Gas Turbine Solid Oxide Fuel Cell (MGT-SOFC) hybrid process is being developed by the team at BTU-Cottbus Senftenberg. This work focuses on the extension of the pre-design process of a primary surface heat exchanger (PSHX), which is a key component for the coupling between MGT and SOFC, using an 1D/3D hybrid simulation method for the understanding of its behaviour under the influence of heat radiation. In a MGT-SOFC hybrid process the high temperature heat exchanger plays an important role in preheating the fresh air to a minimum operation temperature necessary for SOFC. Due to the special location of this PSHX in the TFC, it is constantly exposed to heat radiation from the SOFC module, which requires additional consideration of its influence for better model accuracy. A first design, which is later extended through an 1D Flow network model, based on 𝜖 - 𝑁𝑇𝑈 method is presented. A complete 3D-CFD simulation with consideration of heat radiation is initially employed for the whole flow process to examine the first design. However, this approach proves to be highly computationally expensive due to the large dimensional difference between the plenum for cathode exhaust air and the fine channels in the PSHX. To reduce the computational effort, the flow and heat transfer in the PSHX is modelled by 1D elements. The flow in the plenum is simulated by 3D-CFD, which better accounts for convection and thermal radiation. A comparison between 3D-CFD and 1D/3D hybrid model is performed. A significant reduction of simulation time and computing resources can be achieved for well calibrated hybrid model without compromising on accuracy. In the talk, the effect of insulation layer thickness variations on the heat transfer on the plenum side due to heat radiation and their influence on the heat exchanger efficiency are discussed. Consequently, design improvements are realized based on the previous findings. Finally, the 1D/3D hybrid simulation method is evaluated and prepared for the general applications in thermal management of machines based on coupled MGT-SOFC process.}, language = {en} } @misc{XieMathiazhaganBarkowskietal., author = {Xie, Tianxiao and Mathiazhagan, Akilan and Barkowski, Daniel and Starick, Tommy and Berg, Heinz Peter and H{\"o}schler, Klaus}, title = {Comparison of convective heat transfer in metal foam-filled channels of three different cross-sections}, series = {Numerical Heat Transfer, Part A: Applications}, volume = {85}, journal = {Numerical Heat Transfer, Part A: Applications}, number = {2}, issn = {1521-0634}, doi = {10.1080/10407782.2023.2181892}, pages = {222 -- 236}, abstract = {This work introduces a new approach of analyzing convective heat transfer in porous medium by considering the foam structure as a type of fin. It provides the resulting heat transfer characteristics for the design of a longitudinally flowed tube bundle reformer used for the Micro Gas Turbine Solid Oxide Fuel Cell (MGT-SOFC) hybrid process. Owing to a limited experimental database available in literature for the above-mentioned situation, a physical model is initially introduced for a channel flow configuration between two large flat plates using a commercial PDE solver. This model is then validated with experimental results available in literature. A comparison with theoretical solutions is also conducted. Later, this model is modified/adapted for a pipe flow configuration. The physical model for a channel with representative cross-section shape of a longitudinally flowed tube bundle is more complex and is therefore built in a commercial CFD-Solver. A comparative study of the heat transfer behavior in channels of different cross-sections is performed based on a new dimensionless correlation, whose physical coherence with fin efficiency is explained and mathematically proved. The applicability of the heat transfer correlation from one cross-sectional shape to the other are discussed. The proposed new treatment of the porous medium as a fin structure considerably simplifies the heat transfer analysis in porous medium by the clear physical meaning behind fin efficiency and Biot number. This relationship contributes to a better understanding of the heat heat transfer characteristics in porous media in contrast to the correlation between Nusselt number and Reynolds number. Furthermore, this correlation enables a direct comparison between foam structures of different parameters because the fin efficiency is always between 0 and 1. The strong physical background of new correlations also enhances the reliability and plausibility at characterizing and designing the metal foam for heat transfer enhancement.}, language = {en} }