微气体螺旋槽推力轴承润滑数值模拟  

Numerical Predication of the Performance of Micro Gas Lubricated Spiral Groove Thrust Bearing

作　　者：刘韧[1] 王晓力[1] 

机构地区：[1]北京理工大学机械与车辆工程学院,北京100081

出　　处：《机械工程学报》2010年第21期113-117,共5页Journal of Mechanical Engineering

基　　金：国家自然科学基金(10872031);北京市自然科学基金(3102025);高等学校学科创新引智计划(B08043)资助项目

摘　　要：对微气体螺旋槽推力轴承润滑性能进行数值模拟。变换坐标将螺旋线转换为直线使其对网格的适应性更强。在新坐标系下应用有限体积法对考虑微尺度效应的雷诺方程离散,采用分块加权的方法考虑槽台高度不连续性,保证槽台边界上的质量流量守恒,得到适合超高速、微尺度气体螺旋槽推力轴承润滑性能的数值求解方法。利用Newton-Raphson方法求解出各节点压力分布,进而得到微气体螺旋槽推力轴承承载力。通过对比发现,考虑微尺度效应时,微气体螺旋槽推力轴承承载力有所降低;随着轴承间隙的减小,微尺度效应对轴承性能的影响也愈为明显。A numerical analysis of micro spiral groove thrust bearing with gas lubrication is presented. The spiral curve is changed into straight line by coordinate transformation in order to make it more adaptive to mesh grid. In the new coordinate system,finite volume method （FVM） is employed for the discretization of Reynolds equation with micro scale effect considered. The block-weight approach is used to deal with the non-continuity of the groove-land height,so as to ensure the conservation of the mass flow rate on the boundary of groove land,and then the numerical solution method for the performance of the micro spiral groove thrust bearing with gas lubrication under ultra high speed,is obtained. The Newton-Raphson method is employed to solve the nonlinear equation system so that the pressure distribution as well as the bearing capacity is obtained. Through comparison,it is found that when the micro-scale effect is considered,the bearing capacity of spiral groove thrust bearing is reduced,and the influence of micro-scale effect on the bearing performance is more obvious with the decreasing of bearing clearance.

关 键 词：有限体积法 螺旋槽 气体润滑 微尺度效应 

分 类 号：TH113[机械工程—机械设计及理论]