双燃料对汽油机HCCI燃烧与排放的影响  

Effects of Dual Fuels on HCCI Combustion and Emissions in Gasoline Engine

作　　者：李忠照[1] 邓家轩[1] 章健勇[1,2] 卲强 吕兴才[1] 黄震[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240 [2]上海汽车集团股份有限公司乘用车公司技术中心,上海201804

出　　处：《内燃机工程》2013年第S1期31-36,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家"九七三"重大基础研究项目(2013CB228405);上海市重大基础研究项目(09DJ1400302)

摘　　要：采用双燃料喷射系统在进气道分别喷入汽油和正庚烷,结合优化动力技术手段,实现了4缸汽油机的均质混合气压燃(HCCI)稳定燃烧。研究了在不同EGR条件下,燃料比例对汽油机HCCI燃烧和排放的影响。研究结果表明:随着汽油比例的增加,燃烧相位推迟,燃烧持续期延长,HC和CO排放随之增加,最优工况点对应的EGR率降低。提高正庚烷的比例,HCCI燃烧对EGR敏感性降低,可以提高EGR率上限。在同一燃料比例下,随着EGR率的变化,CA10与CA50有线性关系,其斜率与燃料中汽油比例正相关。Stable homogeneous charge compression ignition(HCCI)combustion in a commercial 4-cylinder gasoline engine was realized through a dual-fuel(gasoline/n-heptane)port injection system based on optimized kinetic process technology.Effects of gasoline/n-heptane ratio on HCCI combustion and emissions under different EGR rates were investigated.Results show that gasoline proportion increase leads to combustion timing retarding,combustion duration extending,higher HC and CO emissions and lower EGR rate for the optimal operating condition point.As n-heptane proportion increases,HCCI combustion becomes less sensitive to EGR rate,so its upper limit can be risen.Under fixed dual fuel ratio,the combustion and emission characteristics for CA10and CA50exhibit a linear variation with EGR rate,its slope is positively correlative with gasoline proportion in the fuel blends.

关 键 词：内燃机 均质压缩着火 双燃料 废气再循环 燃烧与排放 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]