音圈电机喷油器的喷雾特性试验  

Experimental Study on Spray Characteristics of Voice Coil Motor Injector

作　　者：武浩 章振宇[1] 张付军[1] 高宏力 Wu Hao;Zhang Zhenyu;Zhang Fujun;Gao Hongli(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Beijing Aerospace Time Feihong Technology Company Limited,Beijing 100094,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京航天时代飞鸿技术有限公司,北京100094

出　　处：《内燃机学报》2022年第2期162-170,共9页Transactions of Csice

基　　金：国家自然科学基金资助项目(51806013);工业和信息化部资助项目(JCKY2019602D018);北京理工大学“青年教师学术启动计划”资助项目(2019CX04031).

摘　　要：通过定容燃烧弹,采用高速摄像技术研究了不同环境压力、燃油温度以及喷射脉宽对音圈电机(VCM)喷油器宏观喷雾特性的影响.结果表明:在低环境压力条件下,喷雾形态呈标准的空心锥状,液膜表面可见清晰的沿流向分布的流线结构.在高环境压力条件下,喷雾主体受到较强挤压,喷雾主体周围产生明显的大尺度对称漩涡(CRV)结构.当燃油温度从30℃升至70℃时,喷雾的形态以及宏观特性未发生较明显变化.提高音圈电机的驱动电压后,喷雾的破碎长度明显减小.当喷射脉宽小于2.0 ms时,喷雾末端发生明显的坍塌.当喷雾脉宽大于3.0 ms时,喷雾的发展过程和最终形态不再发生明显改变.Effects of ambient pressure,fuel temperature and injection duration on the macro spray characteristics of a voice coil motor(VCM)injector were experimentally studied using high-speed backlit imaging technology in a constant volume combustion vessel.The results show that,spray morphology exhibits a standard hollow cone shape with clear jet-string structure distributed downstream of the spray surface under sub-atmospheric conditions.Under high ambient pressure,spray mainstream is strongly squeezed and a large-scale counter-rotating vor-tex(CRV)is generated on the periphery of spray mainstream.When the fuel temperature increases from 30℃to 70℃,the spray morphology and macro characteristics show no significant change.Increasing of voice coil motor injector driving voltage substantially reduces spray breakup length.When the injection duration is less than 2.0 ms,noticeable collapse occurs downstream of spray.When the injection duration is larger than 3.0ms,spray process and ultimate stable shape of the spray no longer change significantly.

关 键 词：音圈电机 射流雾化 喷雾特性 空心锥状喷雾 

分 类 号：TK413.8[动力工程及工程热物理—动力机械及工程]