高雷诺数下气体润滑数学模型的研究  

Research on Mathematical Model of Gas Lubrication in the Condition of High Reynolds

作　　者：王学敏[1] 朱平[1] 付豹[1] 

机构地区：[1]中国科学院等离子体物理研究所,安徽合肥230031

出　　处：《机床与液压》2010年第13期58-62,79,共6页Machine Tool & Hydraulics

基　　金：国家"九五"大科学工程EAST项目资助(计投资(1998)1303号);中国科学院重要方向性资助项目

摘　　要：经典的气体润滑理论是假设流动区域内是层流流动,并且在气膜中忽略惯性力。20世纪中叶以来,各种低黏度的高转速和大尺寸轴承广泛应用于航空和低温透平领域,可能发生惯性力作用和非层流流动,轴承内出现复杂的Poiseuille-Couette混合三维湍流流动,边界层和惯性力对润滑流体的作用很大,因此润滑薄膜理论不再适用。概括无层流流动的基本情况,分析层流和湍流中惯性力的作用,在理论上建立湍流条件下的气体轴承的数学模型。最后,提出利用CFD模拟来解决这些问题,它将成为研究气体润滑的一个新方向。The classical theory of gas lubrication assumes that the flow regime is laminar and the inertia forces in the gas film are negligible. Since the middle of 2Oth century, a variety of high speed or large size bearings lubricated with low viscous fluid are used in space and cryogenic domain widely, inertia effects and non laminar flow can occur. A combined Poiseuille-Couette three-dimensional flow can be occurred in the thin film, the boundary layer effect and the inertia forces will be important, therefore the thin film equation of lubrication is not appropriate anymore. A general view of non-laminar lubrication was presented. The effects of inertia forces in laminar and in turbulent flows were shown. The mathematical model of gas bearings operating in turbulent flow regime were built in theory. A better solution to these problems was pointed out which was the computational fluid dynamics （CFD） simulations as one of the de- velopment tendencies of gas lubrication.

关 键 词：气体润滑 雷诺方程 CFD 湍流 

分 类 号：TH133.35[机械工程—机械制造及自动化]