Aimed at the problem of low lubricant oil and poor retention on the inner ring of angular contact ball bearings with oil-air lubrication,a lubrication efficiency enhancement method was proposed by designing circular dimple-shaped surface texture on bearing inner ring raceway.Based on the air-liquid two-phase flow model and the multiple reference frame method,the numerical model of oil-air two-phase flow inside textured angular contact ball bearing cavity was established,and the effect of inner ring texture on bearing oil-air two-phase flow was analyzed.The results show that the surface texture can significantly improve lubricant oil retention on the inner ring,while improving the distribution of lubricant oil inside bearing cavity.The oil-air two-phase flow is more irregular in the vicinity of the micro texture,and the resulting pressure and velocity gradients are conducive to improving the bearing capacity of oil film.With the increase of rotational speed,the lubrication efficiency enhancement of inner ring texture is relatively weakened,while with the increase of oil supply,the lubrication efficiency enhancement of inner ring texture is more significant.