Simulation Analysis on 475 Diesel Engine Performances of Injection Characteristics

Quanhui Hou, Jun Yang, Yonglian Xiong, Jigang Liu

The School of Automotive, Yancheng Institute of Technology, Yancheng, 224051, China

Abstract: In order to study the influence of different fuel injection laws on the combustion process of 475 diesel engine. CFD software Fire was used to simulate and analyze the combustion process under the three injection Characteristics. The combustion simulation model was established and the accuracy of the model was verified. The effects of different injection laws on pressure, temperature, heat release and emission were simulated. The results show that the diesel engine had good power and economy performance under the rule of triangular injection. Because the delayed combustion period was too long, there were more mixed gases in the initial combustion, which leads to higher pressure ratio, rough work, more NOx and CO emissions, less carbon emissions in the initial combustion. The temperature and pressure in the cylinder were lower, the cumulative heat release was less, and the carbon smoke emission was more under rectangular fuel injection pattern. The diesel engine performance of trapezoidal injection was in the middle.

Keywords: Diesel engine; Injection law; Simulation analysis; Combustion