Abstract: The effct of air pressures on high density-low temperature diesel combustion and performance was analyzed through FIRE． Simulation calculation of 4100 engine demonstrated that the combustion path could avoid the Soot and NOx main generating areas under different intake pressure; pressure and the cumulative heat release increase as intake pressure increased; intake pressure had a significant effect on engine performance; further increase in intake pressure could reduce Soot and NOx emissions，significantly improve the dynamic performance of the engine and reduce fuel consumption，which indicated that the high density－low temperature combustion mode could reduce emissions and increase thermal efficiency by controlling intake pressure．

Key words: diesel, intake pressure, high density-low temperature combustion, numerical simulation

摘要： 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，其燃烧路径大部分避开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。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。

关键词: 柴油机, 进气压力, 高密度－低温燃烧, 数值模拟