A Simulation Study on the Effect of Start-of-Injection and Swirl Rate on the Low Temperature Combustion

Abstract:

Based on the CFD simulation software, a study on the effect of the EGR, start of injection and swirl rate on the low temperature combustion is conducted. The results show that the combustion and heat release lag, meanwhile the cylinder pressure, temperature, peak of heat release rate and accumulated heat release decrease with the increased EGR rate. Besides, NOx emissions decrease drastically with the increased EGR rate, while soot, UHC and CO emissions increase. When the EGR rate is kept constant at 40%, and the start of injection is advanced from 353°CA to 345°CA, the combustion and heat release are advanced, the efficiency and fuel economy are improved. When the EGR rate and start of injection are kept constant at 40% and 345°CA, and the swirl rate is increased from 1.0 to 3.0, the soot, UHC and CO emissions is decreased.