进气道喷水对直喷汽油机燃烧排放及爆震影响的数值模拟  

Numerical Analysis of the Impact of Inlet Manifold Water Injection on Combustion Emission and Knock of Direct Injection Gasoline Engine

作　　者：陈子逸 汪俊君 颜伏伍[1] 张际洲 王宇[1] CHEN Zi-yi;WANG Jun-jun;YAN Fu-wu;ZHANG Ji-zhou;WANG Yu(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Dong Feng Motor Corporation Technical Center,Wuhan 430058,China)

机构地区：[1]武汉理工大学汽车工程学院,武汉430070 [2]东风汽车集团有限公司技术中心,武汉430058

出　　处：《武汉理工大学学报》2021年第1期92-102,共11页Journal of Wuhan University of Technology

基　　金：国家重点研发计划(2017YFC0211201)。

摘　　要：为改善汽油机经济性、降低污染物排放,以某1.0L三缸直喷汽油机为基础采用数值模拟的方法,研究了进气道不同喷水位置及喷水量对燃烧、排放以及爆震的影响。结果表明:进气道中部喷水与远离进气门喷水相比燃烧相位提前,峰值缸压略大,氮氧化物(nitrogen oxides,NO_(x))、一氧化碳(carbonic oxide,CO)排放量较低,碳烟和未燃碳氢化合物(unburned hydrocarbons,UHC)排放量差别较小;接近进气门喷水时燃烧相位延后程度大,峰值缸压低,对爆震的抑制效果较好,NO_(x)、碳烟及CO排放量较低,但UHC排放量大幅增加;远离进气门喷水时,随着喷水量增加,爆震强度降低,但缸内个别区域爆震抑制效果较差,削弱了喷水对爆震的抑制效果。To improve economy and reduce emissions of the gasoline engine,the effects of different water injection(WI)positions and quantities on combustion,emission and knock were studied by numerical simulation based on a 1.0 L three-cylinder GDI engine.The results show that the combustion phase of the WI position in the middle of the intake port is earlier than that the position far away from the intake valve,the peak cylinder pressure is slightly higher,the emissions of nitrogen oxides(NO_(x)),carbon monoxide(CO)are lower and the difference of the soot and unburned hydrocarbons(UHC)emissions is small;when the WI position is close to the intake valve,the combustion phase delay dramatically,the peak cylinder pressure is low,the effect of knock suppression is better,the emissions of NO_(x),soot and CO are low,but UHC increases greatly;when the WI position far away from the intake valve,with the increase of the WI quality,the knock intensity decreases,but the knock suppression effect on individual areas in the cylinder is poor,which weakens the knock suppression effect on WI.

关 键 词：进气道喷水 直喷汽油机 喷水量 燃烧 排放 爆震 

分 类 号：TK411.2[动力工程及工程热物理—动力机械及工程]