期刊
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
卷 31, 期 5, 页码 845-849出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2010.04.012
关键词
Large Eddy Simulation (LES); Cyclic variations; Direct injection spark ignition (DISI) internal; combustion engine; Air-fuel mixing; Fuel spray injection
资金
- FVV-Project [896]
- [SFB 568]
Direct injection spark ignition (DISI) engines have a large potential to reduce emissions and specific fuel consumption. One of the most important problem in the design of DISI engines is the cycle-to-cycle variations of the flow, mixing and combustion processes. The large Eddy Simulation (LES) based analysis is used to characterize the cycle-to-cycle fluctuations of the flow field as well as the mixture preparation in a realistic four-stroke internal combustion engine with variable charge motion system. Based on the analysis of cycle-to-cycle velocity fluctuations of in-cylinder flow, the impact of various fuel spray boundary conditions on injection processes and mixture preparation is pointed out. The joint effect of both cycle-to-cycle velocity fluctuations and variable spray boundary conditions is discussed in terms of mean and standard deviation of relative air-fuel ratio, velocity and mass fraction. Finally a qualitative analysis of the intensity of cyclic fluctuations below the spark plug is provided. (c) 2010 Elsevier Inc. All rights reserved.
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