稀薄条件下空气静压导轨气膜气体流态分析

发布时间：2018-01-02 01:03

本文关键词：稀薄条件下空气静压导轨气膜气体流态分析　出处：《机床与液压》2017年05期 　论文类型：期刊论文

【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,将气膜支撑区的气体划分为近壁层、稀薄层、连续流层,给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,通过LAMMPS(Largescale Atomic/Molecular Massively Parallel Simulator)仿真气膜支撑区气体流态并计算其压力。结果表明:随着气流速度的增大,气膜有效压力减小,连续流层的厚度增大,稀薄层的厚度减小,当到达一定速度值时,气膜内压力不在分层,速度滑移现象可以忽略。从而验证分层理论的合理性。
[Abstract]:Based on the law of gas molecular movement and collision in the gas film supporting region of the air static guide rail, the theory of gas film stratification is proposed. The gas in the film support region is divided into near-wall layer, rarefied layer and continuous flow layer. The basis of dividing the rarefied layer and the continuous flow layer is given, the physical model is established and the corresponding governing equation is put forward. Through LAMMPS(Largescale Atomic/Molecular Massively Parallel Simulator). The gas flow pattern in the film supporting region is simulated and the pressure is calculated. The results show that the gas flow rate increases with the increase of the gas velocity. The effective pressure of the film decreases, the thickness of the continuous flow layer increases, and the thickness of the thin layer decreases. When a certain velocity is reached, the pressure in the film is not stratified. The phenomenon of velocity slip can be ignored, which verifies the rationality of the theory of stratification.
【作者单位】：昆明理工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51305185)
【分类号】：TH136
【正文快照】： 0前言在空气静压导轨中,工作台面与承载板间形成的气膜对空气静压导轨的稳定性、精密度等产生重要影响。润滑气膜由于气体稀薄性在导轨的界面上产生速度滑移,进而导致整个润滑气膜内气体流态发生变化[1]。速度边界滑移经历了边界无滑移条件假设,线性滑移条件假设,近似滑移本构

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