GDI多孔喷油器内部流动及喷雾特性研究  

Internal Flow and Spray Characteristics of GDI Multi-hole Injector

作　　者：王磊磊[1] 杜家益[1] 袁银男[2] 宋睿智[3] 耿文娟[3] 袁亚飞[3] 

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]南通大学机械与工程学院,江苏南通226019 [3]一汽无锡油泵油嘴研究所,江苏无锡214063

出　　处：《车用发动机》2014年第3期71-75,共5页Vehicle Engine

基　　金：江苏省自然科学基金(BK2011181);江苏省自然科学基金(BK2011181)资助;江苏高校优势学科建设工程资助(苏政办发[2011]6号)

摘　　要：采用两相流非线性空化模型对GDI多孔喷油器内部流动进行数值模拟,使用喷孔出口计算结果,结合Huh-Gosman喷雾模型在定容室内对喷油器喷雾特性进行数值模拟。通过喷雾试验对计算模型进行验证,分析了喷油压力和喷射背压对喷雾特性的影响。研究结果发现:在喷雾形态上模拟结果与试验结果接近,贯穿距离模拟值略大于试验值;提高喷油压力可以增加贯穿距离,增强燃油与空气的相互作用,减小SMD;在较高的喷射背压下,喷雾贯穿距离明显减小,油束末端的燃油聚集严重。The internal flow of GDI multi-hole nozzle was simulated with the two-phase non-linear cavitation flow model .In the constant volume chamber ,the spray characteristics of injector were simulated with the calculated flow results of nozzle out-let and Huh-Gosman model .The numerical model was verified by the spray test and the influences of injection pressure and back pressure on spray characteristics were analyzed .The research shows that the simulation results are close to the experimen-tal results in the spray pattern and the former spray penetration is slightly larger than the latter .The increased injection pres-sure can improve the spray penetration ,strengthen the interaction between fuel and air and decrease the （Sauter mean diameter） SMD .In the higher injection back pressure ,the spray penetration decreases obviously and the fuel accumulates seriously in the beam end .

关 键 词：直喷汽油机 多孔喷油器 流动分布 喷雾特性 

分 类 号：TK413.84[动力工程及工程热物理—动力机械及工程]