喷油参数对直喷汽油机怠速微粒排放影响的试验研究  

Research on the Effect of GDI Engine Idling Injection Parameters on Particle Emissions

作　　者：袁超[1,2] 洪伟[1] 苏岩[1] 解方喜[1] 王锐 

机构地区：[1]吉林大学汽车仿真与控制国家重点试验室,长春130022 [2]一汽铸造有限公司,长春130062 [3]机械工业第九设计研究院有限公司,长春130011

出　　处：《内燃机工程》2016年第5期9-13,20,共6页Chinese Internal Combustion Engine Engineering

基　　金：国家自然科学基金项目(51276080);国家"八六三"高技术研究发展计划项目(2012AA111702)

摘　　要：在一台直喷汽油机上针对怠速工况通过改变喷油时刻和喷油量对微粒排放特性进行了试验研究，研究结果表明：偏浓与偏稀的混合气都会导致怠速工况微粒数量浓度的增加，微粒数量浓度粒径分布呈单峰分布，曲线峰值出现在微粒直径69.8～93.1 nm之间，数量级在107～108，主要形态为聚积态。随着喷油时刻的提前，微粒数量浓度因燃油与空气混合时间的增加而减少，粒径分布呈单峰分布，积聚模态微粒数量浓度大于核模态数量浓度，数量级在10^7～10^8，微粒表面积浓度随着喷油时刻的提前而减小。Research on a direct injection gasoline engine under idling condition was conducted via changing injection timing and injection quantity to investigate particulate emission characteristics. The results show that both the rich and lean mixture will lead to the increase in the particle number density under idling condition. The relationship between particle number and particle size shows a single peak distribution and the curve peak locates between 69.8 nm to 931 nm diameter, with nucleation mode particles on the order of 107~108. With the injection timing advance, particle number density will decrease due to the reduction of fuel and air mixing time. The relationship between particle number and particle size also shows a single peak distribution. The accumulation mode particle number density is greater than nucleation mode particle number density on the order of 10^7~10^8. The particle surface area concentration will decrease with injection timing advance.

关 键 词：内燃机 直喷汽油机 喷油 微粒 排放 

分 类 号：TK411.5[动力工程及工程热物理—动力机械及工程]