Simulation study on in-cylinder combustion process for high pressure common rail diesel engine

Based on YD4A75-C3 electronic-controlled common rail diesel engine, the characteristic of in-cylinder combustion was simulated. The research results showed that fuel vapor mainly is formed in the front of the jet spray, then the great part of fuel is diffused to the combustion chamber wall, concave and clearance by jet kinetic energy. In-cylinder peak temperature region all most appears in the outer space of fuel distribution, in the region oxygen content is comparatively higher and burning rate is relatively higher. Due to unburned fuel and combustion products absorbed more quantity of heat, and its distribution area also has relatively higher temperature .NO mainly is formed in the relatively higher oxygen-rich area in the outer space of high temperature combustion flame, and Soot is formed in the high-temperature and fuel-rich region.