喷油策略对发动机喷雾及燃烧的可视化研究  

An Optical Investigation of the Influence of Spray and Combustion by Fule Injection Strategy

作　　者：朱宏飞 张双 江枭枭 杜家坤 陈泓 李钰怀 Zhu Hongfei;Zhang Shuang;Jiang Niaoniao;Du Jiakun;Chen Hong;Li Yuhuai(Guangzhou Automotive Group Co.,Ltd.Automotive Engineering Research Institute,Guangdong Guangzhou 511400)

机构地区：[1]广州汽车集团股份有限公司汽车工程研究院,广东广州511400

出　　处：《汽车实用技术》2020年第12期162-165,共4页Automobile Applied Technology

摘　　要：在一台侧置多孔喷油器的单缸光学发动机上通过时序控制单元控制喷油时刻,研究喷油策略对缸内喷雾发展过程及燃烧特性的影响。研究结果表明,喷油时刻过早,油束会撞击活塞顶面形成油膜,产生扩散燃烧火焰,增加碳烟排放,且会减小燃烧速率,增加燃烧不稳定性;喷油过晚,缸内滚流变弱,缸内油气混合不均匀,局部过浓区域会产生扩散燃烧火焰,增加燃烧不稳定性。The influence of injection strategycontrolled by Engine Timing Unit on spray development and combustion characteristics was experimentally studied on a direct injection optical single cylinder gasoline engine with side-mounted multihole injectors.The results show that if the injection timing is too early,the spray will impingement on the piston,produce diffused flame,generate more soot and improve the combustion instability.If the injection timing is too late,the mixture in the cylinder forms uneven because of the weak tumble,and the rich area will generate more soot and improve the combustion instability.

关 键 词：光学单缸机 喷油时刻 燃烧室 燃烧特性 

分 类 号：U464[机械工程—车辆工程]