径向游隙对角接触球轴承两相流热特性的影响

径向游隙直接影响角接触球轴承内部两相流的分布以及热特性。为探究不同径向游隙下角接触球轴承油气润滑两相流热特性变化规律，基于两相流理论以及轴承换热机制，建立数值分析模型模拟轴承腔内油气两相流流动特性，分析径向游隙和轴承运行工况对轴承腔内流场分布以及温升的影响，并通过轴承温升试验验证了仿真结果。结果表明：油气两相流中油相受离心力影响主要分布在轴承外圈，径向游隙增大使得油相体积分数减少；轴承温升随着径向游隙增大而减少，一定程度上增大径向游隙可以减少轴承生热量。研究结果为探究角接触球轴承油气润滑热特性以及改善轴承腔结构参数提供了参考。

Influence of Radial Clearance on Thermal Characteristics of Two-phase Flow in Angular Contact Ball Bearing

Radial clearance directly affects the distribution of two-phase flow and the thermal characteristics of angular contact ball bearings.In order to explore the thermal characteristics of oil-gas lubrication two-phase flow in angular contact ball bearings under different radial clearance,a numerical analysis model was established based on two-phase flow theory and bearing heat transfer mechanism to simulate the flow characteristics of oil-gas two-phase flow in bearing cavities,and to analyze the effects of radial clearance and bearing operating conditions on the flow field distribution and temperature rise in bearing cavities.The simulation results was verified by the bearing temperature rise test results.The results show that the oil phase is mainly distributed in the bearing outer ring under the influence of centrifugal force,and the increase of radial clearance reduces the volume fraction of oil phase.Bearing temperature rise decreases with the increase of radial clearance,and increasing radial clearance can reduce bearing heat generation to a certain extent.The research results provide a reference for exploring the oil-gas lubrication thermal characteristics of angular contact ball bearings and improving the structural parameters of the bearing cavity.