TY - GEN A1 - Dückershoff, Roland A1 - Biesold, Volker A1 - Berg, Heinz Peter T1 - Einsatz der Laser Patricle Image Velocimetry und der Ammoniak-Diazo-Messtechnik bei der Entwicklung moderner Hochdruckturbinen mit lokalem Druckaufbau und zeitlich begrenzter Strömungsablösung KW - Laser Patricle Image Velocimetry Ammoniak Diazo Y1 - 2002 ER - TY - CHAP A1 - Feiler, Christoph A1 - Berg, Heinz Peter T1 - Strömungsfeldvermessung und Wärmeübergangsmessung an Reynolds-ähnlichen Turbinenkaskaden T2 - Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 3 KW - Strömungsfeldvermessung und Wärmeübergangsmessung an Reynolds-ähnlichen Turbinenkaskaden Y1 - 2002 SP - 1821 EP - 1831 PB - DGLR CY - Bonn ER - TY - CHAP A1 - Berg, Heinz Peter A1 - Antoshkiv, Oleksiy A1 - Chen, X.-M. A1 - Liu, F. T1 - Einsatz von neuartigen Entwicklungswerkzeugen bei der Brennraumgestaltung von Flugmotoren T2 - Motto: Luft- und Raumfahrt - Schmelztiegel der Disziplinen, Deutscher Luft- und Raumfahrtkongress 2002, Stuttgart, 23. bis 26. September 2002, Bd. 2 Y1 - 2002 SP - 1499 EP - 1506 PB - DGLR CY - Bonn ER - TY - JOUR A1 - Chen, X.-M. A1 - Liu, Fushui A1 - Berg, Heinz Peter T1 - Untersuchung der Zylinderinnenströmung an einen BDE - Motor mittels Laser - PIV Y1 - 2002 ER - TY - JOUR A1 - Chen, X. A1 - Berg, Heinz Peter A1 - Keil, M. T1 - Flexible dynamische Messdatenerfassung an einem Motorprüfstand Y1 - 2002 ER - TY - CHAP A1 - Ahlinder, Stefan A1 - Berg, Heinz Peter A1 - Reile, E. T1 - Modelling of compact tube bundle heat exchanger as porous medium using Reynold´s anallgy N2 - Numerische Untersuchung der Strömung und der Wärmeübertragung in einem kompakten Rohrbündel-Wärmetauscher, der als poröses Medium modelliert ist. KW - modelling KW - compact tube bundle heat exchanger KW - porous medium modelling KW - CFX-TASCflow KW - CFD KW - flow KW - heat transfer KW - hot gas flow Y1 - 2005 ER - TY - CHAP A1 - Antoshkiv, Oleksiy A1 - Krüger, Falko A1 - Sarradj, Ennes A1 - Berg, Heinz Peter T1 - Acoustical Diagnostic of Spray-Airflow Interaction in a Modern Aero Engine Combustor Chamber T2 - Deutscher Luft- und Raumfahrtkongress 2009, Bd. Manuskripte Y1 - 2009 SN - 978-3-932182-64-8 SN - 978-3-932182-64-2 PB - DGLR CY - Bonn ER - TY - CHAP A1 - Dückershoff, Roland A1 - Biesold, Volker A1 - Berg, Heinz Peter T1 - Filmkühlung bei verzögerter Hauptströmung und lokaler Strömungsablösung T2 - Motto: Luft- und Raumfahrt - Made in Germany, Deutsche Technologie im internationalen Wettbewerb, Deutscher Luft- und Raumfahrtkongress 2001, Hamburg, 17. - 20. September 2001, Bd. 3 Y1 - 2001 SP - 1715 EP - 1720 PB - DGLR CY - Bonn ER - TY - JOUR A1 - Dückershoff, Roland A1 - Biesold, Volker A1 - Berg, Heinz Peter T1 - Einsatz der Laser-Patricle-Image Velocimetry und der Ammoniak-Diazo-Messtechnik zur Untersuchung der Filmkühlung zukünftiger Hochdruckturbinen Y1 - 2002 ER - TY - CHAP A1 - Berg, Heinz Peter A1 - Malenky, Uwe A1 - Antoshkiv, Oleksiy A1 - Mattke, Robert T1 - Kompakte hocheffektive Mikrogasturbine mit integriertem Generator (MTIG): eine Komponente für die seriellen hybriden Antriebssysteme der Elektroflugzeuge von morgen T2 - Deutscher Luft- und Raumfahrtkongress 2015 Rostock N2 - Bei der Neugestaltung unserer zukünftigen Lebensräume sucht die Forschung nach neuartigen Lösungen für die bodengebundene Mobilität. Weiterhin spielt die Erforschung umweltverträglicher Antriebstechnologien für die Luftfahrt der Zukunft eine wichtige Rolle. Neben den rein elektrischen Antrieben stehen insbesondere fortschrittliche hybride Antriebssysteme im Vordergrund. Systemlösungen werden kurz- bis mittelfristig für die unbemannten Flugzeuge und die allgemeine Luftfahrt benötigt. Es werden effiziente Flugantriebssysteme benötigt, die gegenüber aktuellen Antriebssystemen deutlich weniger Schadstoffe emittieren und Brennstoff-ressourcen schonen. Dabei bietet der Elektroantrieb ein großes Potenzial. Aufgrund des derzeitig ungünsti-gen Verhältnisses zwischen Gewicht und Energieinhalt bei Traktionsbatterien ist jedoch die rein elektrische Flugweise nur für einen sehr kleinen Anwendungsbereich interessant. Deshalb müssen Elektroluftfahrzeuge mit zusätzlichen Energiewandlern und Speichern ausgestattet werden, um akzeptable Reichweiten und An-triebsleistungen bei moderaten Kosten zu gewährleisten. Als zukunftsfähiges Antriebskonzept wird u.a. das hybride elektrische Antriebssystem mit Kleinenergieerzeugern zur Reichweitenverlängerung angesehen. Für den Einsatz als Range-Extender stehen unterschiedliche Konzepte zur Verfügung, die eine Umwandlung von chemischer in elektrische Energie ermöglichen. Die Spezifikation eines Range-Extenders hängt dabei sehr stark von den Anforderungen an zukünftige 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 für E-Luftfahrzeuge traditioneller Bauweise (z.B. zur Verlängerung der Reichweite bei E-Kleinflugzeugen) und für innovative Luftfahrzeuge (als systemintegraler Bestandteil). Bei diesem Konzept handelt es sich um eine Mikrogasturbinen-Generator-Einheit, welche durch einen Rekuperator (Wärmetau-scher zur Abgaswärmenutzung) einen hohen Wirkungsgrad ermöglicht und durch eine weitere Prozesshybri-disierung (z.B. mit eingebetteter SOFC) auch für nicht luftfahrttechnische Bereiche interessant ist. Es werden die Mikrogasturbinen-Generator (MTG)–Basistechnologie beschrieben und die Leistung, der Wirkungsgrad und die Vielstofffähigkeit diskutiert. Außerdem wird eine kompakte Abwandlung mit integriertem Generator (sogenannte MTiG) dargestellt. Weiterhin wird die Bedeutung der Mikrogasturbinenbauart für ein zukünftiges MTG/MTiG-SOFC-Hochwirkungsgradsystem erklärt und die hohe luftfahrttechnische Tauglichkeit der kom-pakten, rekuperierten MTiG-Mikrogasturbinentechnologie für die seriellen hybriden Flugtriebwerkssysteme aufgezeigt. KW - hybride Antriebssysteme, Mikrogastrubine, MTiG; Elektroflugzeuge Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:101:1-20151109556 PB - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. CY - Bonn ER - TY - CHAP A1 - Prechavut, Nontavut A1 - Berg, Heinz Peter T1 - An Experimental Study on Structural Characteristics of Cantilever-Type Foil Bearings T2 - Deutscher Luft- und Raumfahrtkongress 2015 N2 - 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. KW - Air Bearings, Luftlager Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:101:1-201511275091 PB - Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. CY - Bonn ER - TY - GEN A1 - Mardi Kolur, Mohsen A1 - Antoshkiv, Oleksiy A1 - Berg, Heinz Peter T1 - Experimental analysis of the effect of nano-metals and novel organic additives on performance and emissions of a diesel engine T2 - Fuel Processing Technology N2 - 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. KW - diesel engine KW - organic additives KW - emission reduction KW - emulsion fuel Y1 - 2019 UR - https://www.sciencedirect.com/science/article/pii/S0378382019311397 U6 - https://doi.org/10.1016/j.fuproc.2019.106166 SN - 0378-3820 VL - 196 SP - 1 EP - 10 ER - TY - GEN A1 - Berg, Heinz Peter A1 - Himmelberg, Axel A1 - Poojitganont, Thanapol T1 - Hybrid Turbo Compound Fan Engine an Eco-Efficient Propulsion System for Aviation T2 - Materials Science and Engineering : Thai Society of Mechanical Engineering, the 10th International Conference on Mechanical Engineering (TSME-ICOME2019) 10-13 December 2019, Pattaya, Thailand N2 - 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. KW - rotary engine, hybrid combustion engine, aero-engine, air bearing, counter rotating fan, electric flight Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012010 U6 - https://doi.org/10.1088/1757-899X/886/1/012010 SN - 1757-899X VL - 2020 PB - IOP Science CY - Bristol ET - 1. Auflage ER - TY - GEN A1 - Poojitganont, Thanapol A1 - Antoshkiv, Oleksiy A1 - Watjatrakul, Boonchai A1 - Berg, Heinz Peter ED - Ashton, Anete T1 - Efficiency and Emission Simulations of Hydrogen-Fuel City Buses T2 - IOP Conference Series: Materials Science and Engineering N2 - 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. KW - Efficiency, Emission Simulations, Hydrogen-Fuel, Driving Cycles, AVL Cruise Y1 - 2020 UR - https://iopscience.iop.org/article/10.1088/1757-899X/886/1/012025 U6 - https://doi.org/10.1088/1757-899X/886/1/012025 SN - 1757-899X SP - 1 EP - 8 PB - IOP Science CY - Bristol ET - 1. Auflage ER - TY - CHAP A1 - Bondarenko, Evgeniiy A1 - Berg, Heinz Peter A1 - Antoshkiv, Oleksiy ED - Steinberg, Peter T1 - Untersuchung des Verbrauchs- und Rekuperationspotentials eines Elektrobusses mit Turbo-Range-Extender mittels AVL Cruise T2 - Wärmemanagement des Kraftfahrzeugs IX KW - Rekuperationspotential KW - Elektrobus Y1 - 2014 SN - 978-3-8169-3275-8 SP - 341 EP - 356 PB - expert Verlag CY - Potsdam ER - TY - JOUR A1 - Ahlinder, Stefan A1 - Biesold, Volker A1 - Berg, Heinz Peter T1 - Hot side flow investigation on the exhaust case of a recuperated industrial gas turbine KW - Wärmetauscher KW - Gasturbine KW - Rekuperator Y1 - 2006 ER - TY - CHAP A1 - Poojitganont, Thanapol A1 - Izweik, Husni Taher A1 - Berg, Heinz Peter T1 - "Simulation of Flow Field inside the Wankel Combustion Chamber" KW - Wankel KW - Strömung KW - Simulation KW - Gemischbildung Y1 - 2006 ER - TY - GEN A1 - Xie, Tianxiao A1 - Starick, Tommy A1 - Mosgow, Anatol A1 - Berg, Heinz Peter A1 - Höschler, Klaus A1 - Schmidt, Heiko T1 - Thermofluiddynamic pre-design of a primary surface heat exchanger under the influence of heat radiation using 1D/3D coupled simulation method T2 - NAFEMS World Congress 2021, online, 25-29. Oktober 2021 N2 - 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. Y1 - 2021 UR - https://www-docs.b-tu.de/fg-stroemungsmodellierung/public/Starick_2021_NAFEMS_World_Congress_Manuscript.pdf UR - https://agenda.nwc21.org/session.php?s=B5 ER - TY - GEN A1 - Xie, Tianxiao A1 - Mathiazhagan, Akilan A1 - Barkowski, Daniel A1 - Starick, Tommy A1 - Berg, Heinz Peter A1 - Höschler, Klaus T1 - Comparison of convective heat transfer in metal foam-filled channels of three different cross-sections T2 - Numerical Heat Transfer, Part A: Applications N2 - 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. KW - Channel flow with different cross-section KW - Forced convection KW - Heat transfer in porous media KW - New heat transfer correlations Y1 - 2023 U6 - https://doi.org/10.1080/10407782.2023.2181892 SN - 1521-0634 SN - 1040-7782 VL - 85 IS - 2 SP - 222 EP - 236 ER -