点火正时对双喷射汽油机稀燃的燃烧特性与颗粒物排放的影响  

The Effects of Spark Timing on Combustion Characteristics and Particulate Emissions of Lean-burn for Dual-Injection Gasoline Engines

作　　者：毛克让 陶杰 方俊华[1] Mao Kerang;Tao Jie;Fang Junhua(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai,200240,China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《小型内燃机与车辆技术》2020年第3期8-15,21,共9页Small Internal Combustion Engine and Vehicle Technique

摘　　要：基于一台双喷射汽油原型机,开展了点火正时对双喷射稀燃的燃烧特性和颗粒物排放特性的研究。实验结果表明:随着点火正时的提前,燃烧相位提前,缸压与放热率峰值上升,燃烧波动减小,缸内燃烧得到优化,相对于原机直喷燃烧模式最终取得了8.8%的节油效果。不同点火正时会影响颗粒物粒径的分布;颗粒物排放随着点火正时的提前而趋于洁净,在点火正时46°bTDC时,颗粒物数量(PN)相对于原机降低了84%,颗粒物质量(PM)降低了94%。Based on a dual-injection gasoline prototype,the combustion characteristics and the particulate matter emission characteristics of the dual injection lean combustion were studied. The experimental results show that,with the advance of spark timing,the combustion phase is advanced,the cylinder pressure and heat release rate rise,the combustion fluctuation is reduced,and the in-cylinder combustion is optimized. Compared with the direct injection combustion mode of original machine,an 8.8% fuel economy is achieved finally. In terms of particulate matter emission,spark timing would affect the particle size distribution,and the emission would be cleaner with the advance of spark timing. In the case of ST46bTDC,the particle number(PN)is reduced by 84% compared with the original machine,and the particle mass(PM)is reduced by 94%.

关 键 词：双喷射汽油机 稀燃 燃烧特性 颗粒物排放 点火正时 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]