火花辅助对多缸汽油机HCCI燃烧及排放的影响  

Effects of Spark Assisted HCCI on Combustion and Emissions in Multi-cylinder Gasoline Engine

作　　者：郑华航[1] 张旭洲[1] 李忠照[1] 沈义涛 章健勇 方俊华[1] 吕兴才[1] 黄震[1] 

机构地区：[1]上海交通大学动力机械及工程教育部重点实验室,上海200240 [2]上海汽车工业集团,上海201805

出　　处：《上海交通大学学报》2012年第5期695-700,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(50976069);上海市重大基础研究项目(09DJ1400302)

摘　　要：采用优化动力技术手段,利用发动机冷却水和排气余热加热进气,在多缸汽油机上实现了均质混合气压缩(HCCI)燃烧,研究了火花辅助点火对HCCI燃烧及其排放特性的影响.结果表明:当进气温度未达到HCCI稳定燃烧条件时,火花辅助有助于HCCI燃烧,并可增大平均指示压力、最大气缸爆发压力以及最大压力升高率,降低循环波动率,提高燃烧稳定性;火花辅助使得HCCI燃烧出现了2个放热阶段,当点火提前角增加时,主燃烧阶段的放热率峰值增大,燃烧起始点提前;在发动机转速为1200～1600r/min的小负荷范围内,火花辅助可以适当降低NO_x和HC的排放量.Applying optimized kinetic process technology the waste thermal energy in the coolant and exhaust gases for intake air heating was used to realize HCCI combustion in a multi-cylinder gasoline engine. The effects of spark assisted HCCI on combustion and emissions were investigated. The results show that utilization of spark assisted HCCI is found to increase indicated mean effective pressure （IMEP）, p （dp/dO）max and reduce cycle-by-cycle variation so as to improve the stability of HCCI combustion. Spark assisted HCCI can achieve a two-stage combustion. When increasing the spark advance angle, the heat release rate peak value will increase. The introduction of spark significantly advances the combustion to top dead center （TDC） and lowers the NOx and HC emissions.

关 键 词：火花辅助 多缸汽油机 均质混合气压缩燃烧 排放特性 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]