某汽油机用可变排量机油泵空化研究  

Research on Cavitations of Variable Flow Oil Pump of Gasoline Engine

作　　者：胡云萍[1] 唐娟[1] 石秀勇[2] 刘文婷[1] Hu Yunping;Tang Juan;Shi Xiuyong;Liu Wenting(Liaocheng University,Liaocheng 252000;Tongji University,Shanghai 201804)

机构地区：[1]聊城大学,聊城252000 [2]同济大学,上海201804

出　　处：《汽车技术》2018年第6期48-52,共5页Automobile Technology

基　　金：山东省自然基金项目(ZR2014EEQ027)

摘　　要：利用Pumplinx软件建立了某汽油机用叶片式可变排量机油泵的计算流体力学模型,对叶片式可变排量机油泵的空化现象进行了模拟及试验验证,结果表明,空化主要发生在机油泵泵腔内入口侧,空化程度随转速增大而加重,且空泡的主要成分为不凝结气体。对比了不同机油含气量、油温、机油粘度、入口压力和入口几何结构等条件下机油泵出口流量、叶片腔总空泡体积分数分布情况,结果表明,机油含气量、入口压力和入口几何结构对泵内空化程度影响较大,工质参数对泵内空化影响相对较小,减小机油含气量、增大入口压力可有效减少泵内空化程度。A CFD（Computational Fluid Dynamics） model of one gasoline engine vane-type variable flow oil pump was constructed with PUMPLINX. Simulation and experimental validation were conducted to analyze the cavitation phenomenon in vane-type variable flow oil pump. The results indicate that cavitations mainly appear at the entrance of pump chamber. The cavitation becomes serious as engine speed increases. In addition, the main component of cavitation bubble is incondensable gas. The volume fraction and volume fraction distribution of the cavitation bubble in pump chamber and the flow rate of the pump exit were compared under different oil gas content, different oil temperature,different oil viscosity, different entrance pressure and different pump entrance structure. The results show that oil gas content, entrance pressure and entrance structure of the pump have critical influence on cavitation level. The parameters of the working media have less influence on cavitation level. Cavitations can be improved by reducing oil gas content and increasing the entrance pressure.

关 键 词：汽油机 机油泵 空化 

分 类 号：U467[机械工程—车辆工程] TK419[交通运输工程—载运工具运用工程]