混合气分层对HCCI汽油机极限负荷和燃烧特性的影响  

The Effects of Charge Stratification on the Limit Load and Combustion Characteristics of HCCI Gasoline Engine

作　　者：张建珍[1] 刘军[1] 

机构地区：[1]海南大学机电工程学院,儋州571737

出　　处：《汽车工程》2011年第10期855-859,共5页Automotive Engineering

摘　　要：对比研究HCCI汽油机在不同空燃比下采用混合气分层策略时的极限负荷、NOx排放量和燃油经济性,考察了在此策略下过量空气系数λ和EGR率对HCCI发动机燃烧特性的影响。结果表明,混合气分层压缩燃烧模式能有效降低HCCI燃烧的压力升高率,具有拓展负荷范围的潜力,但同时也使NOx排放增加;适当的过量空气系数能在一定程度上改善HCCI发动机的燃烧特性,采用9%的EGR率时发动机油耗率最低,具有明显节油效果。The limit loads,NOx emission and fuel economy of HCCI gasoline engine with a mixture forming strategy of charge stratification under different air-fuel ratio are comparatively studied.With this strategy the effects of EGR rate and excess air coefficient on the combustion characteristics of HCCI engine are investigated.The results indicate that stratified charge compression ignition can reduce the rising rate of combustion pressure and has the potential for extending load range of HCCI mode,but it leads to a higher NOx emission;the appropriate excess air coefficient can improve the combustion characteristics of HCCI engine and the specific fuel consumption reaches its lowest point at a EGR rate of 9%,showing tangible results of fuel saving.

关 键 词：均质混合气压燃 分层混合气压燃 极限负荷 理论空燃比 燃烧特性 

分 类 号：U464.171[机械工程—车辆工程]