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

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