稀薄条件下空气静压导轨气膜气体流态分析

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。

Analysis of Flow State in Aerostatic Guide Way under the Thin Conditions

Based on the molecular motion and collision law of the gas in the aerostatic guide way of inflatable support area, the stratification theory of the gas film was proposed.The gas in inflatable support area was divided into near wall layer, thin layer, continuous flow layer, basis was proposed for dividing the thin layer and continuous flow layer, and the physical model and the corresponding equation were established.Gas flow patterns were simulated in gas film support area and calculated the pressure by LAMMPS.The result shows that with increasing air velocity, the effective pressure of gas film is decreased, continuous flow layer thickness is increased, and the thickness of the thin layer is decreased, there is no layered pressure in the gas film, when certain velocity is reached,and the velocity slippage can be ignored,which then verified the reasonableness of the stratification theory.