基于FLUENT仿真的静压气浮轴承的研究

Research on the Static Pressure Air Bearing Based on FLUENT Simulation

静压气浮轴承的气膜厚度非常薄,与轴承直径之间相差几个数量级,给气体轴承FLUENT仿真带来了困难。通过对气体轴承建模,并根据对称性原理,采用了"半模型"仿真法;又借助FLUENT命令流功能,提出了命令流建模仿真方法。借用以上方法,仿真了静压气体轴承承载力与平均半径间隙的关系,不但简单快捷,还提高了结果的准确性。得出结论:存在最佳的平均半径间隙使静压径向轴承承载力最大,这个值随着轴承其他参数的不同而不同。

Because of the extremely thin film thickness of static pressure air bearing, which always contain several orders of mag- nitude discrepancy, simulation difficulty of air bearing based on FLUENT is increased. By building the model of air bearing and accounting the symmetry principle into consideration, a simulation method named half-model was used. With the assistant of eommaud flow function of FLUENT, the command flow modeling and simulation method was put forward. By the endeavors above, the relationship of static pressure air bearing capacity and the average radius clearance was concluded, which was not only simple and quick, but also improve the accuracy of the results. The conclusions are： the average radius clearance that makes the capacity of radial static pressure bearing largest is existed; the average radius clearance varies as the bearing other parameters vary.