空气喷射量对空气辅助喷射喷雾特性的影响  

Effect of Air Injection Quantity on Spray Characteristics of an Air-Assisted Direct Injector

作　　者：白洪林[1,2] 胡春明[1,3] 李志军[1] 侯圣智[3] 刘娜[3] 

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]中国北方发动机研究所,天津300400 [3]天津大学内燃机研究所,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2016年第2期206-212,共7页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51476112);天津市自然科学重点基金资助项目(11JCZDJC23200);天津市科技计划资助项目(13ZCZDGX04400)

摘　　要：利用激光粒度仪分析了空气辅助喷射喷雾索特平均直径(Sauter mean diameter,SMD)的变化规律,并且分别在定容弹及光学发动机上开展了喷雾特性(喷雾锥角和贯穿距离)的试验研究,引入喷雾半锥角(α角和β角)的概念用以分析在有进气气流时空气喷射量对喷雾特性的影响.结果表明,增加空气喷射量可以改善燃油的雾化效果,特别是当喷雾燃空比γ小于0.8时,喷雾的SMD会有明显降低;在定容弹内空气喷射量的增大会使喷雾锥角减小,但对贯穿距离的影响不大;在光学发动机内由于进气气流的影响,空气喷射量的增加会使喷雾锥角增大,贯穿距离变小,同时喷雾锥角随时间的变化趋势也明显不同于定容弹内的试验结果.The variation law of Sauter mean diameter（SMD）of the air-assisted injection was researched by using laser particle size analyzer. Spray characteristics（spray angle and penetration）were studied by experiments which were completed using a constant volume bomb and an optical engine. In order to analyze the effect of air injection quantity on spray characteristics in the condition of airflow motion,the semi-angle of spray（α andβ）was defined. The results show that the performance of atomization is improved as the air injection quantity increases,and the SMD becomes smaller obviously when the spray fuel-air ratio（γ）is less than 0.8. In the constant volume bomb,spray angle de-creases with the increasing of air injection quantity,while spray penetration has no significant variation. In the optical engine,because of the influence of intake airflow,spray angle enlarges and spray penetration reduces as the air in-jection quantity increases. In addition,the variation tendency of spray angle is markedly different from the experi-mental results in the constant volume bomb.

关 键 词：直接喷射 空气辅助喷嘴 喷雾特性 索特平均直径 光学发动机 

分 类 号：TK413.8[动力工程及工程热物理—动力机械及工程]