直喷时刻对复合喷射汽油机暖机过程燃烧和排放的影响  

Experimental study on effect of compound injection on cold start combustion and emission of gasoline engine

作　　者：孙平[1] 曹智 于秀敏[1] 董伟[1] 刘泽[1] 刘少振 SUN Ping;CAO Zhi;YU Xiu-min;DONG Wei;LIU Ze;LIU Shao-zhen(State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学汽车仿真与控制国家重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2020年第6期1941-1949,共9页Journal of Jilin University:Engineering and Technology Edition

基　　金：移动源污染排放控制技术国家工程实验室开放基金项目(NELMS2018A19);吉林省科技发展计划项目(20150101036JC,20180201006).

摘　　要：通过试验台架采用复合喷射方式实现了不同缸内直喷时刻的暖机过程。试验结果表明:冷却液温度从30℃升至60℃过程中,排放微粒总数量浓度不断减小,在直喷时刻为150°CA BTDC时下降幅度可达到91.7%。缸内直喷时刻对暖机过程中的燃烧和排放状况有重要影响,提前缸内直喷时刻至120°CA BTDC,冷却水温为80℃时,缸内燃烧压力最高可达到4.13 MPa,放热率峰值最高可达到130 kJ/(m3·°CA)。核膜态微粒随缸内直喷时刻的推迟而下降,积聚态微粒随缸内直喷时刻的推迟先下降后上升,在缸内直喷时刻为60°CA BTDC时,微粒总数量浓度最低。Tests of the warm-up process of different direct injections in the cylinder were carried out on a testing rig. The test results show that the total concentration of discharged particles is continuously decreasing,and the drop can reach 91.7% when the direct injection time is 150 °CA BTDC for the liquid temperature in the range from 30 ℃ to 60 ℃. The direct injection timing in the cylinder has an important influence on the combustion and discharge conditions during the warm-up process. When the direct injection time in the cylinder reaches 120°CA BTDC and the cooling water temperature is 80 ℃,the incylinder combustion pressure reaches a maximum of 4.13 MPa,and peak value of the heat release rate reaches a maximum of 130 kJ/(m^3·°CA). The nuclear film particles decrease with the delay of the direct injection time in the cylinder. The accumulated particles decrease first and then rise with the delay of the direct injection time in the cylinder. The total particle concentration is the lowest when the direct injection time in the cylinder is 60 °CA BTDC.

关 键 词：动力机械工程 暖机过程 复合喷射汽油机 直喷时刻 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]