燃料辅助喷射对柴油机起动着火及排放的影响  

Effect of Fuel Auxiliary Injection on Ignition and Exhaust Emission of Diesel Engine during Starting

作　　者：郭亮[1] 刘忠长[1] 苏岩[1] 解方喜[1] 夏玉民[2] 

机构地区：[1]吉林大学汽车工程学院内燃机系,吉林长春130025 [2]解放军装甲兵技术学院,吉林长春130117

出　　处：《车用发动机》2007年第5期22-26,共5页Vehicle Engine

基　　金：国家自然科学基金资助项目(50376019)

摘　　要：为了研究辅助燃料对柴油机起动工况着火及排放的影响规律,在柴油机起动过程中,向进气道内分别喷射不同浓度的乙醚和C3H8进行了试验。试验结果表明:辅助喷射适当种类的燃料,可实现诱导、促进着火并改善燃烧的目的。辅助燃料除应具备良好的挥发性外,其着火性也是改善起动性能的重要因素。进气道喷射C3H8会抑制起动着火性,随喷射浓度的增加,燃烧恶化,HC排放升高;喷射适量浓度乙醚,可以促进起动过程着火,完全消除起动工况失火和不完全燃烧循环,在降低HC排放的同时,减少PM排放50%以上。In order to study the effect of auxiliary fuel on the ignition and exhaust emission of diesel engine during starting, the experiments were carried out by injecting different volume fraction of aether and C3 H8 into inlet port individually under starting conditions. The results indicate that proper auxiliary fuel injection can induce ignition and improve the combustion per- formance. Besides the good volatility, the ignitability of auxiliary fuel is also one of the important factors which can improve the startability. The C3 H8 injection has negative effect to the ignitability of start. With the increase of volume fraction of injected C3 H8, the combustion goes bad and the HC emission increases. To inject proper volume fraction of aether can improve the ignition during starting, entirely eliminate misfiring and incomplete combustion cycles and reduce PM by more than 50 per cent when the HC emission is reduced.

关 键 词：起动 进气道喷射 着火 排放 柴油机 

分 类 号：U483[交通运输工程—载运工具运用工程]