喷嘴开启压力对DISI甲醇发动机燃烧和排放的影响  

Effects of Injector Opening Pressure on Combustion and Emission of DISI Methanol Engine

作　　者：宫长明[1] 彭乐高 孙景震 王康[2] 李栋[2] 陈天翔[2] 

机构地区：[1]大连民族大学机电信息工程学院,辽宁大连116600 [2]吉林大学汽车仿真与控制国家重点实验室,吉林长春130025

出　　处：《车用发动机》2015年第3期70-75,共6页Vehicle Engine

基　　金：国家自然科学基金资助项目(51176063);中央高校基本科研业务费专项资金资助项目(DC201502010203)

摘　　要：在1台经过改装的1.99L自然吸气缸内直喷点燃式甲醇发动机上,进行了喷嘴开启压力对发动机有效热效率、燃烧及排放影响的试验研究。在发动机转速为2 000r/min的各负荷工况下,选取7.5 MPa,12.5 MPa和17.5 MPa 3个喷嘴开启压力进行试验分析。结果表明:随着喷嘴开启压力的降低,发动机有效热效率、最大缸内压力和放热率略微增加,但是在小负荷工况下降低喷嘴开启压力,HC排放和CO排放显著增加,在大负荷工况下提高喷嘴开启压力会使NOx排放显著增加。On a retrofited 1 .99 L direct injection and naturally aspirated spark‐ignition （DISI） methanol engine ,the effects of injector opening pressure on engine effective thermal efficiency ,combustion and emission were researched .At different loads of 2 000 r/min ,the experiments of 7 .5 MPa ,12 .5 MPa and 17 .5 MPa injector opening pressure were conducted .The results show that the effective thermal efficiency ,maximum in‐cylinder pressure and heat release rate slightly increase ,but the HC and CO emissions will increase obviously at low load with the decrease of injector opening pressure .At high load ,the increasing opening pressure will lead to the obvious increase of NOx .

关 键 词：燃料喷嘴 开启压力 缸内直喷 点燃式甲醇发动机 燃烧 排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]