采用旋流喷油器的二冲程直喷汽油机混合气形成过程的数值解析  

Numerical Simulation of Mixture Formation for Two-stroke DI Gasoline Engine with Swirl Injector

作　　者：李新海[1,2] 许伯彦[1] 张寿荣[1] 赵秀亮[2] 

机构地区：[1]山东建筑大学机电工程学院,山东济南250101 [2]山东大学能源与动力工程学院,山东济南250100

出　　处：《车用发动机》2014年第6期23-27,共5页Vehicle Engine

基　　金：国家自然科学基金项目(51376113)

摘　　要：将旋流喷油器应用到二冲程发动机上,利用其喷雾锥角大、贯穿距离较短等优点,高转速下促使燃油在短时间内与空气混合。由三维画图软件绘制实体模型后,使用AVL Fire软件对直喷式喷油器与旋流喷油器的喷雾形态进行对比,模拟二冲程直喷发动机的缸内混合气形成过程。结果表明:在大负荷功率下,在ABDC15°曲轴转角时开始喷射的燃油不会因扫气的影响造成燃油短路,并且能够加快混合速度,获得较好的均质混合气。The swirl injector was applied to two‐stroke engine to accelerate the mixing of fuel and air at high speed based on the advantages of large spray cone angle and short penetration .The solid model was built with 3D drawing software ,the spray shapes of direct injector and swirl injector were compared with AVL Fire software and the in‐cylinder mixture formation for two‐stroke DI engine was simulated .The results show that the fuel injection at ABDC 15° would not lead to fuel short circuit caused by scavenging and can have a better homogeneous mixture because of accelerated mixing .

关 键 词：二冲程直喷发动机 旋流喷油器 贯穿距 喷雾锥角 混合气形成 

分 类 号：TK411.3[动力工程及工程热物理—动力机械及工程]