Effects of Two-Stage Injection on Mixture Formation of Opposed-Piston GDI Engine
Increasing the air inflow can reduce the residual exhaust gas coefficient in the cylinder at low-speed and low-load,but would cause mixture too lean in opposed-piston two-stroke(OPTS)gasoline direct injection(GDI)engine.Focusing on this issue,the strategies of two-stage injection for stratified mixture at the typical part load(2000r/min)were studiedwith CFD software.The models for fuel the scavenging process and spray were verified by tests.Simulation results show that,there is an optimal second injection time forproper mixing,with early or late injection resulting in unreasonable mixture distribution,the best second injection time at 60℃ ATDC.Thefuel quantities of the second injection significantly influencesthe mixture formation,the second injection account for a third of total fuel quantities resulting in reasonable mixture distribution in the cylinder.
opposed-piston two-stroke GDI two-stage mixture
Wang Hao Zhao Zhenfeng Qian Jiance
School of Mechanical and Vehicle Engineering,Beijing Institute of Technology
国内会议
上海
英文
337-340
2015-10-01（万方平台首次上网日期，不代表论文的发表时间）