直喷汽油机喷油器积碳对喷雾落点及喷雾一致性的影响  

Effects of Carbon Deposition on Spray Droppoint and Consistency of a GDI Injector

作　　者：张小雨 裴毅强[1] 秦静[1,2] 王莉 周建伟[1] 李翔[1] 张延峰[1] Zhang Xiaoyu;Pei Yiqiang;Qin Jing;Wang Li;Zhou Jianwei;Li Xiang;Zhang Yanfeng(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China;Internal Combustion Engine Research Institute,Tianjin University,Tianjin 300072,China;College of Engineering and Technology,Tianjin Agricultural University,Tianjin 300384,China)

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072 [2]天津大学内燃机研究所,天津300072 [3]天津农学院工程技术学院,天津300384

出　　处：《燃烧科学与技术》2018年第1期46-53,共8页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51306132)

摘　　要：针对直喷汽油机喷油器积碳问题运用平面激光米氏散射法和白光散射法在喷雾实验台上利用高速摄像机、片激光源和LED光源进行了直喷汽油机喷油器喷雾落点试验及各孔喷雾锥角试验,对比清洁喷油器和积碳喷油器在不同喷射压力下的喷雾落点形态、落点质心位置、各孔喷雾锥角等参数.结果表明:在相同压力下积碳喷油器的流量损失较大;喷雾落点形态变化较大,且分布不均匀,落点区域质心坐标相较于清洁喷油器向喷油器轴线外拓展;积碳喷油器多次独立喷射后喷雾形态和各孔喷雾锥角等参数的一致性变差,且这种一致性差异随着喷射压力的增高而变大.With the methods of Mie scattering and White LED scattering,the spray droppoint characteristics test and spray cone angle test were conducted on a gasoline direct injection(GDI)engine injector by using high speed camera,LED and plane laser on test benches.The spray droppoint pattern,droppoint barycenter,and spray cone angle of each orifice under different injection pressures were compared between clean injector and fouled injector.The results reveal that the flow loss of fouled injector is larger under the same injection pressure,the spray droppoint pattern has a larger variation and the droppoint distribution is uneven,and the droppoint barycenter of fouled injector spreads outward compared with that of the clean injector.The fouled injector is worse than clean injector in the consistency of spray droppoint pattern and spray cone angle after many independent jets and the difference in consistency becomes more obvious with the increase of injection pressure.

关 键 词：直喷汽油机 积碳喷油器 喷雾落点 喷雾一致性 

分 类 号：TK448.21[动力工程及工程热物理—动力机械及工程]