Abstract: In aircraft power plant，characteristics of flow and migration of oil film formed on the surface ofrotating parts for high speed roller bearings，such as inner ring and associated cages，can influence significantly not only the lubrication and cooling states of bearing，but also the morphology and the flow characteristic of oil apart from their surfaces，even the lubrication and heat transfer performances of bearing chambers. Therefore，a rotating disk which is the topological geometry of bearing rotating parts was proposed to study the flow and migra.tion of oil on these surfaces. The VOF method was used to track instantaneously the interface between the oil filmand the air on the disk surface，and then a numerical calculation model about the oil film flow on the surface was established. Effects of operating condition and oil viscosity on the velocity and thickness of oil film on the disk sur.face were discussed in detail. The calculation results show preliminarily that the oil film spreads toward the rim ofthe rotating disk similar to flat disk-shaped sheet and disintegrates into ligaments and droplets at the rim. Thethickness of the oil film decreases progressively along the radial direction of the disk. The thickness increaseswith the increase of the oil flow rate and the oil viscosity，and decreases with the increase of the shaft speed. Thetangential velocity of the oil film increases with the increase of the shaft speed，but is slightly affected by the oilflow rate and the oil viscosity. But the radial velocity of the oil film increases with increasing shaft speed and oil flow rate，and with decreasing oil viscosity. The correctness of the numerical calculation method proposed in thepresent work is validated by compared with the relevant experimental data.

Key words: Rotating disk；Oil film thickness；Oil film velocity；Oil/air two-phase flow；High speed roller bearing

摘要： 为探究轴承旋转运动件表面油膜的流动和迁移特性，针对其拓扑结构——旋转圆盘，采用 VOF方法描述圆盘表面油膜与空气界面的动态变化，结合流体动力学理论，建立了旋转圆盘表面油膜流动分析的计算模型，通过数值计算，分析和探讨了运行工况和润滑油粘度对圆盘表面油膜流动速度和厚度分布的影响。计算结果表明:润滑油膜呈近似圆盘状向圆盘边缘运动和迁移，离开圆盘边缘后分裂成油矢和油滴；油膜的厚度沿圆盘径向逐渐变薄；并随着供油量和润滑油粘度的增加而增大，随着圆盘转速的增高而减小；油膜的切向速度随着圆盘转速的增高而增大，但受供油量和润滑油粘度的影响较小；油膜的径向速度随着圆盘转速和供油量的增加而增大，随着润滑油粘度的增大而减小。与相关试验结果的对比表明，建立的数值分析方法具有较好的可靠性和普适性。

关键词: 旋转圆盘；油膜厚度；油膜速度；油气两相；高速滚动轴承