高速齿轮箱润滑系统密封结构的数值研究  

Numerical Analysis on Seal Structure of High-speed Gearbox Lubrication System

作　　者：吴特[1] 米彩盈[1] 

机构地区：[1]西南交通大学机械工程学院,四川成都610031

出　　处：《铁道学报》2014年第4期26-31,共6页Journal of the China Railway Society

基　　金："十一五"国家科技支撑计划(2009BAG12A02);国家国际合作专项(2013DFA71330)

摘　　要：以高速动车组驱动齿轮箱小齿轮电机端的迷宫密封为研究对象,建立带有甩油环的迷宫密封数值仿真模型——可压缩二维轴对称有旋流动。采用标准k-ε湍流模型和增强壁面处理模拟迷宫密封腔内流场分布及泄漏特性。应用Fluent软件,对Navier-Stokes方程、能量方程和湍流方程采用有限体积法离散,压力-速度耦合采用SIMPLE算法。研究空腔深度对密封性能的影响,确定最优的空腔深度,同时研究压差和转速对泄漏量的影响规律。研究结果表明:随着空腔深度的增加,泄漏量先减小后增大;随着压差的增大,泄漏量增大;在不考虑温升的条件下,转速对泄漏量的影响很小,但随着转速的增大,密封性能提高。Taking the labyrinth seal at the small-gear motor end of the driving gearbox of the high-speed EM U as the research object ,the numerical simulation model of the labyrinth seal with the oil thrower was set up ,which was fully compressible ,two-dimensional axisymmetric swirl flow .The distribution of flow field within the lab-yrinth seal cavity and the leakage characteristics were simulated by using the standard k-εturbulence model a-long with enhanced wall treatment .The Navier-Stokes equation ,and energy and turbulence equations were dis-creted with the finite-volume method and Software Fluent .The SIMPLE algorithm was used for pressure-ve-locity coupling .The effect of the cavity depth on leakage was studied and the optimum cavity depth was deter-mined .The effects of pressure difference and rotational speed on leakage were also studied .The results show as follows ：Along with lengthening of the cavity depth ,the leakage firstly falls down and then rises up ;the leakage increases with increasing of the pressure difference ;without considering the temperature rise ,the rota-tional speed shows no significant influence on leakage ,however ,raising of the rotational speed improves seal-ing performance .

关 键 词：齿轮箱 迷宫密封 流场 泄漏量 

分 类 号：U260.332[机械工程—车辆工程]