喷油润滑球轴承流动特性的数值研究  

Numerical Analysis of Flow Characteristics Inside Oil-Jet Lubrication Ball Bearing

作　　者：李慎龙[1] 侯潇男 张金乐[1] 吴维[2] LI Shenlong;HOU Xiaonan;ZHANG Jinle;WU Wei(North China Vehicle Research Institute,Beijing 100072,China;School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国北方车辆研究所,北京100072 [2]北京理工大学机械与车辆学院,北京100081

出　　处：《北京理工大学学报》2024年第5期494-500,共7页Transactions of Beijing Institute of Technology

基　　金：国家自然科学基金资助项目(51975045)。

摘　　要：基于流体体积(VOF)方法建立了喷油润滑球轴承的数值仿真模型.分别采用滑移网格法和多重参考系(MRF)方法对轴承油气两相流动进行了数值计算,得到了轴承内部流场分布和搅油力矩.搭建了轴承流场可视化试验台,对比分析了仿真流场与高速摄影实测流场.结果表明:滑移网格下的轴承内部油液体积分数大于用MRF方法的计算结果,且当转速逐渐增大时,轴承内部油液体积分数均逐渐减小,且在离心力作用下,润滑油更多地分布在轴承外圈滚道.滑移网格下的轴承内部流场油液分布更接近实测流场.仿真计算的搅油力矩随转速增大而增大,MRF方法下搅油力矩大于滑移网格下的搅油力矩,平均误差约为12.3%.两种方法对搅油力矩的计算均具有较好的一致性,但MRF时间成本更低.In this paper,a numerical simulation model of oil-jet lubrication ball bearing was established based on volume of fluid(VOF),and a sliding mesh and multiple reference frame(MRF)methods were used separately to calculate and simulate its oil-air two-phase flow,obtaining the oil distribution inside bearing and the churning moment.Then,a visual test-bed was developed for the flow field of oil-jet lubrication ball bearing to analyze comparatively the simulated flow field and the experimental flow field captured by a high-speed camera.The results show that the oil volume fraction inside a bearing simulated by sliding mesh is larger than that by MRF,and the oil volume fraction can decrease gradually with rotation speed increasing.Under the centrifugal effect,the oil distribution is more focused on the outer race.Simulated with sliding mesh,the distribution of the flow field is closer to the visual result.The simulated churning moment increases with an increasing rotation speed,and the churning moment calculated by MRF shows larger than that by sliding mesh,possessing only about 12.3%error between two methods.The two calculation values of churning moment are basically consistent,but the calculation cost of MRF is lower.

关 键 词：流体体积 轴承 两相流 滑移网格 多重参考系 搅油力矩 

分 类 号：TH137[机械工程—机械制造及自动化]