直喷汽油机喷雾粒径特性  

Gasoline direct injection engine spray droplet characteristics

作　　者：虞浏[1,2] 刘忠长[1] 刘江唯 杜宏飞 许允[1] 

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]中国第一汽车股份有限公司技术中心,长春130011

出　　处：《吉林大学学报（工学版）》2017年第5期1482-1488,共7页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(21327803)

摘　　要：利用激光衍射技术研究了直喷汽油机喷油器喷雾粒径在不同喷射压力、不同喷射脉宽和不同空间条件下随时间变化特性。试验结果表明:在喷雾开始和结束时喷孔内外压差不稳定,容易出现大直径液滴;在喷射过程中燃油喷射压力和喷射脉宽对喷雾粒径的影响是一个动态过程,在燃烧系统开发过程中需要优化喷油器参数以获得最优喷雾粒径;燃油喷雾液滴在空间分布并不均匀,油束中心区域液滴直径大于边缘区域液滴直径。Spray droplet size is one of the important parameters to evaluate the spray characteristics of injector,and is also one of the significant boundary conditions of the engine combustion system.In this paper,the spray droplet size characteristics of Gasoline Direct Injection(GDI)engine is studied using laser diffraction technique under the conditions,such as different spray pressure,injection pulse width and space position.The results demonstrate first,the big size droplet is prone to occur due to the unstable pressure difference between the inner and outer of the orifice at the beginning and end of spray;second,the influence of spray pressure and injection pulse width on the droplet size is a dynamics process,therefore,it is important to optimize the injector's parameters to obtain appropriate spray droplet size;third,spray droplet distribution in the space is not uniform and droplet size in the center field of the spray plume is bigger than that in the boundary field.

关 键 词：动力机械工程 直喷汽油机 喷雾 粒径 激光衍射 

分 类 号：TK41[动力工程及工程热物理—动力机械及工程]