Zusammenfassung
Due to increasingly strict emission regulations, improving and optimizing the combustion process is one of the main research focuses of internal combustion engine development. Combustion instability is a significant parameter, which affects the emission level, and it is reflected by cycle-to-cycle variation. Therefore, understanding the reasons for cycle-to-cycle variation is crucial for the internal combustion design. This paper investigates the causes of cycle-to-cycle variation of a spark-ignition engine through the 3D large eddy simulations done by CONVERGE v3.0. The analysis focuses on the mechanism and consequences of intake tumble flow variation. The variation of tumble ratio between cycles is found to cause fluctuation in turbulent kinetic energy, which will result in different combustion processes. Moreover, according to the results the tumble variation is attributed to the random turbulent eddies in a specific area between the cylinder head and inflow. Comparing tumble variations under different engine specifications, it is found that reducing the size of this area e.g., by changing cylinder head geometry or delaying intake valve opening, contributes to the smaller tumble variation.
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Acknowledgements
The paper is the scientific result of the FVV research project “Modelling Turbulence” (Project Nr. 1435). The research project was carried out in the framework of the industrial collective research programme (IGF/CORNET no. 286 EN). It was supported by the Federal Ministry for Economic Affairs and Climate Action (BMWK) through the AiF (German Federation of Industrial Research Associations eV) based on a decision taken by the German Bundestag, Swiss Federal Office of Energy (SFOE) and the Science for a moving society (funding no. 6014351). The authors gratefully acknowledge the support received from the FVV eV and from all those involved in the project.
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© 2023 Der/die Autor(en), exklusiv lizenziert an Springer Fachmedien Wiesbaden GmbH, ein Teil von Springer Nature
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Feng, Y., Mirsch, N., Grill, M., Kulzer, A.C., Günther, M., Pischinger, S. (2023). Numerical Investigation on the Mechanism of Tumble Caused Cycle-to-Cycle Variation of High-Tumble Spark-Ignition Engine. In: Kulzer, A.C., Reuss, HC., Wagner, A. (eds) 23. Internationales Stuttgarter Symposium. ISSYM 2023. Proceedings. Springer Vieweg, Wiesbaden. https://doi.org/10.1007/978-3-658-42236-3_24
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