气体挤压膜边界影响分析

Analysis of Boundary Effect of Gas Squeeze Film

气体挤压膜轴承是一种新型的非接触式气体支承方式,该支承方式的支承性能主要由间隙内的气膜压力分布决定,而气膜压力的分布需要通过求解气体雷诺方程得到。边界条件对气体挤压膜的压力分布的求解有着显著影响,因此,确定一个与实际条件接近的边界条件非常必要。通过流体动力分析方法分析两种不同边界区域边界压力的变化,给出了新边界条件下间隙内的压力和速度分布,结果表明新边界条件作用时,间隙内气体与外界环境气体交换时压力与速度的变化是连续的。

Gas squeeze film bearing is a new non-contact gas bearing, its supporting performance deperds on the film pressure in the gas squeeze film gap. The distribution of pressure is obtained by solving the Reynolds equation with squeeze term. Because the boundary condition has influence on its pressure distribution greatly, it is important to defermine it. This paper analyzes the variation of two different boundaries by fluid dynamic analysis method and obtains the distribution of the pressure and velocity in the gap of the new boundary. The result shows that, the pressure and velocity vary continuously in exchange of the gap and external gas in the new boundary.