Abstract:In order to solve the problem of lubrication and cooling in highspeed angular contact ball bearing cavity,the flow characteristics of oil-air two phase in the high-speed angular contact bearing cavity were numerically analyzed by the volume of fluid(VOF) method and moving reference frame(MRF) model,and the effect of outlet location on oil phase volume fraction and temperature rise in bearing cavity were investigated.The results show that the oil phase volume fraction and temperature distribution in the bearing chamber are not evenly distributed in the circumferential direction,the lowest oil phase volume fraction and the highest temperature rise are located at 240° relative to the inlet along the direction of bearing rotation.When changing the angle of outlet position from 180° to 240°,the temperature rise in the bearing cavity is decreased and the oil phase volume fraction is increased,when changing the angle of outlet position from 240° to 270°,the temperature rise in the bearing cavity is increased and the oil phase volume fraction is decreased.When the rotating speed is increased,the influence of the outlet position on the oil phase volume fraction and temperature rise is weakened,and the distribution of oil phase and the temperature rise are more uniform in the circumferential direction.Therefore,choosing the position of outlet can get better lubrication effect.