Numerical simulation of PCCI combustion in diesel engine with different injection timing
1. School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Department of Equipment Support, College of Zhenjiang Watercraft, Zhenjiang, Jiangsu 212013, China; 3. School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：The combustion process in a singlecylinder turbocharged diesel engine with pilotpilotmain injection strategy was simulated by the computational fluid dynamics(CFD) software. The effects of injection timing on combustion process, NO generation and soot were analyzed in detail. The results show that when the injection timing is retarded, the incylinder pressure is decreased gradually with reduced main heat release peak, and the position of heat release peak moves far away from the top dead center with increased premixed combustion fraction to show more apparent feature of low temperture PCCI combustion mode. For 10％ heat release (q10) with retarding of fuel injection timing, the soot generation is decreased as the lean premixed combustion takes the major, while more NO is generated due to the rapid heat release of premixed mixture. For 90％ heat release (q90), NO emission is decreased due to the total low temperature effect in cylinder, while the soot is increased with latter decreasing due to the extended combustion space and the high premixed combustion fraction. The favorable tradeoff between NO and PM emissions can be well compromised in a diesel engine with the low temperature PCCI mode.
梅德清, 涂立志, 雎志轩, 姜士阳, 王向丽, 袁银男. 不同喷油正时的柴油机PCCI燃烧过程数值模拟[J]. 江苏大学学报（自然科学版）, 2018, 39(1): 7-13.
MEI De-Qing, TU Li-Zhi, JU Zhi-Xuan, JIANG Shi-Yang, WANG Xiang-Li, YUAN Yin-Nan. Numerical simulation of PCCI combustion in diesel engine with different injection timing[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2018, 39(1): 7-13.
2018, Vol. 39 
