Experiment and Development of Visualization Setup of Free impinging Spray for GDI Engine FAN Qianwang, LI Liguang, CHEN Yichuan, SHI Kun

Abstract:

The visualization setup and control system of spray and wallimpingement for gasoline direct injection (GDI) engines is presented.The design of high pressure fuel supplying system,the driving mode of GDI engine injector and spray control system were demonstrated in detail.Besides,the spray penetrations and spray cone angles under different injection pressure and ambient pressure conditions,the spray development and fuel concentration change under different ambient pressure conditions and spray wallimpingement characteristics under different impingement angle and impingement distance conditions,were investigated by emlpoying the visualization setup.The experimental results show that the spray tip penetration and spray cone angle increase with the increasing of the injection pressure; the spray tip penetration decreases with the increasing ambient pressure,but the spray cone angle increases.In addition,compared to the impingement angle with 60°,the impingement angle with 75° is more favorable to spray development and atomization.Thus the developed visualization setup and control system of spray and wallimpingement can work reliably and steadily.