超声速流下多供气孔圆盘静压止推气体轴承性能分析

Performance Analysis of Multi-orifice Circular Aerostatic Thrust Bearing under Supersonic Flow

应用Fluent软件对多供气节流小孔圆盘静压止推气体轴承进行三维流场的模拟计算,分析供气小孔数、气膜间隙和供气压力对圆盘静压止推气体轴承性能的影响,并和Reynolds方程解的结果进行比较,分析气膜内发生超音速流和不发生超音速时气膜内的压力分布和马赫数情况。结果表明,应用Fluent数值模拟可以很方便地处理节流小孔进入到气膜内区域的复杂流场流动;增加供气孔数、减小气膜间隙和降低供气压力能够避免多供气孔静压止推气体轴承气膜内发生超音速。

The numerical simulation of the three-dimensional flow field of circular thrust aerostatic bearing with multiorifice was simulated by Fluent software. The effect of the supply holes number, film clearance and supply air pressure on the performance of circular aerostatic thrust bearing was analyzed, and the results were compared with Reynolds equation solution. The pressure distribution and Maeh number at the film clearance were analyzed in the condition of supersonic flow or not occurring supersonic flow. The results show that the complex gas flows at the area of orifice hole into the film entrance region can be handled easily by the Fluent numerical simulation application. Increasing for the number of supply holes, reducing the film gap and cutting down supply gas pressure is a way to avoid supersonic flow occurring in the circular thrust aerostatie bearing.