期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 32, 期 -, 页码 2759-2766出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2008.06.185
关键词
Large eddy simulation (LES); Two-phase flow; Cycle-to-cycle fluctuations; Direct Injection Spark Ignition (DISI) IC-engine; Air-fuel mixing
资金
- FVV-project [896]
The call for environmentally compatible and economical vehicles, still satisfying demands for high performance, necessitates immense efforts to develop innovative engine concepts. Whereas direct injection gasoline engines promise considerable fuel savings, they are prone to large variations in the flow and mixing field. These fluctuations may result in Combustion failures leading to a total loss of the energy stored in a full cylinder load and to the ejection of un-burnt hydrocarbons into the environment. The present work aims at investigating the impact of the phenomena of cycle-to-cycle variations on air-fuel mixing processes in a realistic IC-engine using LES. The configuration under Study represents a generic four-stroke direct spray injection engine with variable charge motion system. To appraise the numerical predictions. available experimental data are first compared to LES achievements. The LES is then assessed by means of two index of quality. Finally, the impact of the cycle-to-cycle Velocity fluctuations On the spray propagation and mixing processes is pointed Out With emphasis on results close to the ignition point. (c) 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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