In this research, an angular contact ball bearing with two-half inner rings is used as a carrier. Considering the two-phase flow characteristics of oil and air in the bearing, the flow characteristics of lubricating oil inside the bearing with under-race lubrication are studied. Based on the volume of fluid (VOF) method and the standard k–ε turbulent flow model, the characteristics of oil and air two-phase flow inside the ball bearing are analysed. The bearing internal pressure field distribution, streamline distribution, and other flow properties for the different radial working clearances, pocket clearances and guide clearances are determined. The distribution of the lubricating oil in key areas is observed. The oil phase volume fraction of the key lubrication areas, such as the cage pocket surface and the inner and outer ring surfaces is used to evaluate the influence of different structural parameters on the bearing lubrication performance. The lubrication influences of the inner and outer guides of the cage are evaluated, and the internal flow characteristics of the bearing are analysed with different guide clearances. The results show that with the radial working clearance range from 0.100 to 0.145 mm, the pressure in the working contact area of the bearing decreases 26%. The pocket clearance ranges from 0.48 to 0.28 mm, and the pressure in the working contact area of the bearing significant increases from 0.642 to 1.165 MPa. From this perspective, the larger the radial working clearance and pocket clearance are, the more favourable it is for bearing lubrication. For bearings with under-ring lubrication, when the bearing adopts outer guidance, the distribution of lubricating oil in the key areas of the bearing is worse than that for internal guidance. However, the pressure in the working contact area of the bearing slightly increases from 0.642 to 0.759 MPa with the inner guide clearance increasing from 0.4 to 0.8 mm.

中文翻译：

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滚道下润滑高速球轴承局部微间隙设计中的内部两相流研究

在本研究中，采用具有两个半内圈的角接触球轴承作为载体。考虑轴承内油气两相流动特性，研究滚道润滑轴承内部润滑油的流动特性。基于流体体积法（VOF）和标准k - ε湍流模型，分析了球轴承内部油气两相流的特性。确定了不同径向工作间隙、兜孔间隙和引导间隙的轴承内部压力场分布、流线分布和其他流动特性。观察重点部位润滑油的分布情况。通过保持架兜圈表面、内外圈表面等关键润滑区域的油相体积分数来评价不同结构参数对轴承润滑性能的影响。评估了保持架内外导轨的润滑影响，并分析了不同导轨间隙下轴承的内部流动特性。结果表明，当径向工作游隙在0.100～0.145 mm范围内时，轴承工作接触区的压力降低了26%。兜孔间隙范围为0.48至0.28毫米，轴承工作接触区域的压力从0.642兆帕显着增加至1.165兆帕。从这个角度来看，径向工作游隙和兜孔游隙越大，越有利于轴承润滑。对于环下润滑的轴承，当轴承采用外引导时，润滑油在轴承关键区域的分布比内引导时差。然而，随着内引导间隙从0.4毫米增加到0.8毫米，轴承工作接触区域的压力从0.642 MPa略有增加到0.759 MPa。