@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{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{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} } @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} } @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} } @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{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{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{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{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{AntoshkivBakeBerg, author = {Antoshkiv, Oleksiy and Bake, Sebastian and Berg, Heinz Peter}, title = {Spray-Airflow Interaction in a Modern Gas Turbine Combustion Chamber}, language = {en} } @inproceedings{AntoshkivBakeBerg, author = {Antoshkiv, Oleksiy and Bake, Sebastian and Berg, Heinz Peter}, title = {Spray Phenomena and their Influence on the Ignition Performance of a Modern Aeroengine Combustor}, language = {en} } @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{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} } @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{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{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} }