边界参数对汽油压燃(GCI)小负荷工况燃烧和排放的影响  

Simulation of Gasoline Compression Ignition Model Under Low Load Condition

作　　者：陈师 郑安文[1] 肖干 张光德[1] CHEN Shi;ZHENG An-wen;XIAO Gan;ZHANG Guang-de(School of Automobile and Traffic Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China)

机构地区：[1]武汉科技大学汽车与交通工程学院

出　　处：《机械设计与制造》2019年第12期112-116,共5页Machinery Design & Manufacture

基　　金：湖北省自然科学基金青年基金(2017CFB299);湖北省自然科学基金重点基金项目(2015CFA113)

摘　　要：针对小负荷工况下汽油压燃(GCI)燃烧模式燃烧波动和排放超标等问题,建立了单缸四冲程汽油压燃发动机仿真模型,并借助CONVERGE模拟平台,对压缩比、缸内初始涡流比、喷油压力等因素进行了仿真分析。结果表明:压缩比为16.5时,峰值缸压出现在上止点之后,可实现小负荷稳定燃烧。缸内初始涡流比为1.5时,峰值缸内平均温度最高,且排放得到进一步优化。喷油压力为20MPa时,能达到较高的热效率和较低的排放。研究结果为实现小负荷工况稳定燃烧,拓展负荷范围提供了理论基础。To solve the problems of combustion fluctuation and excessive emission in the gasoline compression ignition(GCI)combustion mode under small load conditions,a single-cylinder four-stroke diesel engine simulation model was established,and the compression ratio,cylinder initial swirl ratio,injection pressure and other factors were simulated by ulitizing the CONVERGE simulation platform.The results show that the peak cylinder pressure appears at the top and bottom points when the compression ratio is 16.5,and the small load stable combustion can be realized.When the initial swirl ratio is 1.5,the peak cylinder average temperature is the highest,and the emission is further optimized.When the injection pressure is 20MPa,higher thermal efficiency and lower emission can be achieved.The research results provide a theoretical basis for the realization of stable combustion under small load conditions and expanding the load range.

关 键 词：汽油压燃 小负荷 压缩比 缸内初始涡流比 喷油策略 

分 类 号：TH16[机械工程—机械制造及自动化]