不同进气压力对高密度-低温柴油机燃烧的数值模拟

Numerical Simulation of Different Intake Pressures on High Density-Low Temperature Diesel Combustion

应用fire软件模拟分析不同进气压力对高密度-低温柴油机燃烧和性能的影响。对4100柴油发动机进行模拟计算,结果表明:不同进气压力情况下,其燃烧路径大部避开Soot和NOx的主要生成区域;提高进气压力会使燃烧充分,放热速率加快。进气压力对发动机性能影响明显,进一步增大进气压力能在Soot和NOx排放有效降低的同时,发动机的动力性能明显提高而燃油消耗降低。这表明高密度-低温柴油机燃烧模式能够通过提高进气压力同时降低排放和提高热效率。

This paper analyzes the effect of air pressures on the high density-low temperature diesel combustion and performance by using FIRE to simulate 4100 engine.The results show that in the case of the different intake pressures,the combustion path avoids the Soot and NOx main generating areas,and that pressure and the cumulative heat release increase as intake pressures increase.The effect of inlet pressure on the engine performance is obvious.Further increasing the inlet pressure can reduce Soot and NOx emissions while significantly improving the dynamic performance of the engine and reducing fuel consumption.This indicates that the high density-low temperature combustion mode by controlling the inlet pressure can reduce emissions and increase thermal efficiency.