面向缸内直喷汽油机燃烧调控中若干基础问题研究综述

A Review of the Basic Problems in Combustion Regulation of Direct Injection Gasoline Engines in Cylinders

汽油机缸内直喷技术可比进气道喷射自然吸气均质混合气汽油机热效率提高20-25%。然而稀燃时火焰传播速率低,火核生成困难,因此采用分层混合气燃烧组织方式用于提高点火性能和燃烧速率,采用提高缸内充量运动强度和废气再循环在保证燃烧速率的同时降低NOx排放。因此对缸内直喷汽油机燃烧调控进行研究具有提高内燃机利用效率的意义。

Direct injection technology in gasoline engines can improve the thermal efficiency of gasoline engines by 20-25%compared to intake port injection of naturally aspirated homogeneous mixtures.However,the flame propagation rate is low during lean burning,and the formation of fire core is difficult,so the layered mixture combustion structure is used to improve the ignition performance and combustion rate.NOx emissions are reduced while maintaining combustion rates by increasing in-cylinder charge movement intensity and exhaust gas recirculation.Therefore,the gasoline engine is directly injected into the cylinder.The study of combustion regulation has the significance of improving the utilization efficiency of internal combustion engines.