直喷汽油机自由-撞壁喷雾可视化台架开发及试验

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

摘要:

介绍了直喷汽油机可视化喷雾及其撞壁实验装置与控制系统,详细阐述了高压供油系统的设计、直喷汽油机喷油器驱动模式以及喷雾控制系统.基于该可视化装置研究了不同喷油压力和环境压力下喷雾贯穿距与喷雾锥角的变化、不同环境压力下喷雾发展与燃油浓度的变化以及不同撞壁角度和距离下喷雾撞壁特性.试验结果表明,随着喷油压力增加,喷雾贯穿距与喷雾锥角均增大;随着环境压力增加,喷雾贯穿距减小而喷雾锥角增大.此外,75°撞壁角度较60°撞壁角度更加有利于撞壁后喷雾发展和燃油雾化.开发的可视化喷雾及其撞壁试验装置与控制系统能够可靠而稳定地运行.

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.