基于CFD静压气体轴承的仿真分析

Simulation Analysis of Static Pressure Gas Bearing Based on CFD

摘要: 利用CFD流体计算软件对气体静压轴承三维内部流场进行数值模拟与分析。在计算中采用了湍流(Realizable K-ε)计算模型，利用计算结果对气体静压轴承的性能进行分析，得出了承载力随着转速的增加而明显的变大；在节流孔附近湍流效果明显，远离节流孔流场逐渐恢复层流；同时通过对节流小孔附近的截面的压力和马赫数分析，得出了在节流孔附近存在着超音速现象，对轴承的稳定性有一定影响，并且通过节流孔附近的压力分布以及承载力与转速的关系，得出了转速对静压轴承的静特性影响不可忽略。

Abstract: The 3-D internal flow field of aerostatic bearing is numerically simulated and analyzed by using CFD fluid calculation software. In the calculation, the calculation model of turbulence (Realizable K-ε) is used. The calculation results are used to analyze the performance of the static pressure bearing of the gas. It is concluded that the bearing capacity increases obviously with the increase of the speed. The turbulent effect near the throttle hole is obvious, and the flow field away from the throttle hole is gradually restored to the laminar flow. At the same time, the pressure and Maher number of the section near the throttle hole are analyzed, and the results are obtained. The supersonic phenomenon exists near the throttle hole, which has a certain influence on the stability of the bearing, and through the pressure distribution near the throttle hole and the relationship between the bearing capacity and the speed, the influence of the speed on the static characteristics of the static pressure bearing can not be ignored.