EGR对甲醇-柴油组合燃烧柴油机燃烧和排放的影响  

Effect of EGR on Combustion and Emission for Methanol-diesel Engine

作　　者：张健[1] 王忠[1] 刘帅[1] 赵洋[1] 张登攀[1] 李仁春[1] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013

出　　处：《车用发动机》2014年第6期64-68,78,共6页Vehicle Engine

基　　金：国家自然科学基金(51376083);江苏省高校自然科学基金(10KJA470009;13KJA470001);江苏省2013年度普通高校研究生科研创新计划项目(CXZZ13-0672);2011年江苏高校优势学科建设工程资助项目(苏政发办[2011]6号)

摘　　要：利用三维仿真软件AVL Fire建立进气道喷射甲醇、缸内喷射柴油的模型,应用试验结果验证了模型的正确性。改变2 200r/min,136N·m工况下的EGR率(0%,5%,15%,25%和35%),分析了EGR对甲醇-柴油组合燃烧发动机燃烧过程和排放的影响。结果表明:与EGR率为0相比,随着EGR率增加,甲醇-柴油组合燃烧发动机着火延迟期先缩短后延长,缸内最高压力降低,EGR率为5%时,着火延迟期缩短2°曲轴转角;随着EGR率增加,放热率曲线由双峰分布向单峰分布转变,最高温度下降,高温持续时间缩短;随着EGR率增加,NOx排放降低,CO和炭烟排放上升,与EGR率为0时比,EGR率为15%时的NOx排放量降低了54%。The model of intake port methanol injection and in‐cylinder diesel injection was built with AVL Fire software and was verified with test results .The effect of EGR on combustion and emission for methanol‐diesel engine was studied by chan‐ging the EGR rate of 0% ,15% ,25% and 35% respectively under the condition of 2 200 r/min and 136 N · m .The results showed that the ignition delay first shortened and then prolonged and the maximum in‐cylinder pressure decreased with the in‐crease of EGR rate .The ignition delay shortened by 2° when the EGR rate was 5% .The distribution curve of heat release rate changed to single peak from double peak and the duration of in‐cylinder high temperature shortened with the decline of maxi‐mum temperature when the EGR rate increased .With the increase of EGR rate ,the emission of NOx reduced and that of CO and soot increased .Compared with 0% EGR rate ,NOx emission of 15% EGR rate reduced by 54% .

关 键 词：双燃料发动机 废气再循环 燃烧过程 排放 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]