考虑气泡体积分布的轴承油气紊流润滑模型  

Oil Aeration Turbulent Lubrication Model of High Speed Journal Bearing in Consideration of Interface Effect and Bubble Size and Distribution

作　　者：华成玉 林晓辉[1] 

机构地区：[1]东南大学机械工程学院

出　　处：《机械制造与自动化》2015年第1期13-15,24,共4页Machine Building & Automation

摘　　要：将高速工况下的油气润滑介质视为由连续液体和离散气泡构成的混合流,基于连续方程、Navier-Stokes方程、壁面定律紊流模型和气泡体积分布函数,导出了考虑界面效应的混合流体紊流广义Reynolds方程,建立了高速主轴径向轴承油气紊流动压润滑模型,模型同时考虑了气泡体积分布以及两相界面间动量传输效应。通过数值耦合求解广义Reynolds方程和流体速度方程,获得了油气润滑动压轴承的压力分布、紊流流速分布。结果表明,气泡尺寸分布和界面效应将使油膜发散区产生正压力。Oil aeration lubricating liquid model is regarded as mixed fluid which is composed of continuous phase liquid and discrete phase bubbles in high-speed journal bearing. The generalized Reynolds equation is derived by using the continuity equation,Navier-Stokes equation,law of wall turbulence model and bubble size and distribution function. A oil aeration turbulent lubrication model is established by the generalized Reynolds equation. Especially,the inertial effect of oil film,momentum transfer and energy transfer effect at the gas-liquid interfaces are well considered in this model. In numerical algorithm,a coupling strategy is applied in solving both the generalized Reynolds equation and fluid velocity equation. The pressure distribution and the turbulent velocity distribution are obtained. The results show that due to the bubble size and distribution and interface effect,the positive pressure is generated in oil film diverged area.

关 键 词：高速主轴径向轴承 两相紊流润滑 界面效应 

分 类 号：TH133.3[机械工程—机械制造及自动化]