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Wall Heat Transfer in a Multi-Link Extended Expansion SI-Engine
Technical Paper
2017-24-0016
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The real cycle simulation is an important tool to predict the engine efficiency. To evaluate Extended Expansion SI-engines with a multi-link cranktrain, the challenge is to consider all concept specific effects as best as possible by using appropriate submodels. Due to the multi-link cranktrain, the choice of a suitable heat transfer model is of great importance since the cranktrain kinematics is changed. Therefore, the usage of the mean piston speed to calculate a heat-transfer-related velocity for heat transfer equations is not sufficient. The heat transfer equation according to Bargende combines for its calculation the actual piston speed with a simplified k-ε model.
In this paper it is assessed, whether the Bargende model is valid for Extended Expansion engines. Therefore a single-cylinder engine is equipped with fast-response surface-thermocouples in the cylinder head. The surface heat flux is calculated by solving the unsteady heat conduction equation. By using a surface-ratio related weighting method, it is possible to determine a global wall heat loss from the local heat fluxes.
The natural-gas test engine has a multi-link cranktrain to achieve, based on a compression ratio of 12.2, an expansion ratio of 17.6. The cranktrain is later modified by a mechanical adjustment in order to set the strokes to equal lengths, establishing a “conventional” engine process. This enables the comparison of experimentally determined heat transfer characteristics of two different engine processes from the same test engine.
The comparison between the experimentally determined and the modeled heat flux at the conventional engine process shows a very good conformity. As well in the Extended Expansion mode, a good conformity of measured and modeled data is shown, so that the heat transfer model is also valid for this engine process.
Subsequently, the difference in wall heat losses by Extended Expansion is analyzed using engine process simulation. Compared to a base engine with an equal intake stroke, the Extended Expansion engine has a higher wall heat loss.
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Langwiesner, M., Krueger, C., Donath, S., and Bargende, M., "Wall Heat Transfer in a Multi-Link Extended Expansion SI-Engine," SAE Technical Paper 2017-24-0016, 2017, https://doi.org/10.4271/2017-24-0016.Data Sets - Support Documents
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References
- Atkinson , J. Patent “Gas Engine US367496 A” 1887
- Akihisa , D. and Daisaku , S. Research on Improving Thermal Efficiency through Variable Super-High Expansion Ratio Cycle SAE Technical Paper 2010-01-0174 2010 10.4271/2010-01-0174
- Schutting , E. , Dumböck , O. , Eichlseder , H. , Hübner , W. et al. Diagnostics of a Spark Ignition Engine with Extended Expansion - Challenges and Approaches 11. International Symposium on Combustion Diagnostics Baden-Baden 2014
- Bargende , M. Ein Gleichungsansatz zur Berechnung der instationären Wandwärmeverluste im Hochdruckteil von Ottomotoren PhD thesis TU Darmstadt 1991
- Heinle , M. , Bargende , M. , and Berner , H. Some Useful Additions to Calculate the Wall Heat Losses in Real Cycle Simulations SAE Int. J. Engines 5 2 469 482 2012 10.4271/2012-01-0673
- Eichelberg , G. Temperaturverlauf und Wärmespannungen in Verbrennungsmotoren PhD thesis ETH Zürich 1922
- Chang , J. , Güralp , O. , Filipi , Z. , Assanis , D. et al. New Heat Transfer Correlation for an HCCI Engine Derived from Measurements of Instantaneous Surface Heat Flux SAE Technical Paper 2004-01-2996 2004 10.4271/2004-01-2996
- Huegel , P. , Kubach , H. , Koch , T. , and Velji , A. Investigations on the Heat Transfer in a Single Cylinder Research SI Engine with Gasoline Direct Injection SAE Int. J. Engines 8 2 557 569 2015 10.4271/2015-01-0782
- Reipert , P. , Mirold , A. , and Polej , A. Verfahren zur Bestimmung der gasseitigen Oberflächentemperaturen und Wärmeströme in Verbrennungsmotoren 5. Dresdner Motorenkolloquium „Zukünftige Brennverfahren für Dieselmotoren“ Dresden 2003
- Performing more work with less fuel - EXlink http://world.honda.com/powerproducts-technology/exlink 2016
- Steurs , K. Cycle-resolved analysis and modeling of knock in a homogeneous charge spark ignition engine fueled by ethanol and iso-octane PhD thesis ETH Zürich 2014
- Rether , D. and Grill , M. FkfsUserCylinder operation instructions Stuttgart 2015
- Emmrich , T. Beitrag zur Ermittlung der Wärmeübergänge in Brennräumen von Verbrennungsmotoren mit homogener und teilhomogener Energieumsetzung PhD thesis Universität Stuttgart 2010
- Pertl , P. , Trattner , A. , Lang , M. , Stelz , S. et al. Experimentelle Untersuchungen eines Ottomotors mit erweiterter Expansion über den Kurbeltrieb und die bedeutende Rolle der variablen Ventilsteuerung 7. MTZ Fachtagung Ladungswechsel im Verbrennungsmotor 2014
- Heinle , M. Kraftstoffkennzahlen - TP 7 Wärmeübergang Final Report FVV-No. 944 26 Frankfurt am Main 2011