稀薄条件下空气静压导轨膜内气体流态分析  

Analysis of Flow State in Aerostatic Guide Way Under Condition of Rarefied Gas

作　　者：宁方伟[1] 龙威[1] 公玲[1] 

机构地区：[1]昆明理工大学机电工程学院,云南昆明650500

出　　处：《机械设计与制造》2017年第12期45-48,共4页Machinery Design & Manufacture

基　　金：基金项目:微尺度稀薄气体对空气静压导轨的影响(51305185)

摘　　要：基于空气静压导轨气膜支撑区气体分子运动和碰撞规律,提出气膜分层理论,沿气膜高度方向将气膜划分为近壁层、稀薄层、连续流层,提出划分稀薄层和连续流层的依据,建立物理模型并提出相应控制方程。基于空气静压导轨气膜压力递减及气体流速变化规律,将气膜沿长度方向划分为压力驱动区和牛顿摩擦区。通过LAMMPS和FLUENT等仿真气膜支撑区气体流态并计算其流速和压力,得出了相关结论:气膜沿长度方向分为压力驱动区和牛顿摩擦区,沿高度方向分为近壁层、稀薄层、连续流层;气膜分层存在于压力驱动区和牛顿牛顿摩擦区;压力驱动区的气膜分层随气体流速的减小而变弱,牛顿摩擦区的气膜分层保持稳定。Based on the molecular motion and collision law of the gas in the aerostatic guide way of inflatable support area, proposed the stratification theory of the gas film, the gas in inflatable support area was divided into near wall layer, thin layer, continuous flow layer along its height direction, proposed basis for dividing the thin layer and continuous flow layer, proposed physical model and the corresponding equation. Based on air film pressure decreasing in the aerostatic guide way and rate variation of gas flow, the gas in the longitudinal direction was divided into pressure-driven area and Newton friction areta Simulating flow patterns and calculating its velocity and pressure in gas film by LAMMPS and FLUENT, drew the relevant conclusions： the gas film in the longitudinal direction was divided into pressure-driven area and Newton friction area; and it also was divided into near wall layer, thin layer, continuous flow layer along its height direction; Gas stratification present in the pressure--driven and Newton friction areas; the phenomenon of film layered became weaker with slower gas flow in pressure-driven area; Newton friction area remained stable stratificatior~

关 键 词：空气静压导轨 速度滑移 Knudsen数 分子碰撞 牛顿摩擦 

分 类 号：TH16[机械工程—机械制造及自动化] TH47