高雷诺数下径向滑动轴承的热弹流润滑特性  

Thermal Elastohydrodynamic Lubrication Characteristics of Plain Journal Bearings Under High Reynolds Numbers

作　　者：詹萌浩 闫康昊 黄丹[1] 姜冬菊[1] 杭旸 ZHAN Menghao;YAN Kanghao;HUANG Dan;JIANG Dongju;HANG Yang(Department of Engineering Mechanics,Hohai University,Nanjing 211100,China;Wuxi Institute of Applied Technologies,Tsinghua University,Wuxi 214072,China)

机构地区：[1]河海大学工程力学系,南京211100 [2]清华大学无锡应用技术研究院,江苏无锡214072

出　　处：《轴承》2025年第2期20-26,共7页Bearing

基　　金：国家自然科学基金资助项目(12072104)。

摘　　要：径向滑动轴承在高速、重载或大径向间隙等状态下,常伴随着润滑油流态变化、油温升高和轴瓦弹性变形等,对轴承的运行稳定性造成较大影响。联合有限差分法和有限单元法建立紊流、热效应、弹性变形等多因素耦合的润滑仿真模型,分析了轴承在紊流状态下油膜压力和油膜厚度的分布,并讨论了轴承偏心率、转速和间隙比变化时,其承载力和最大油膜压力的变化。结果表明:在高雷诺数下,紊流效应会影响轴承油膜压力和油膜厚度分布,减小最大油膜压力和偏心率,增大最小油膜厚度和偏位角;随着转速和偏心率的增大,油膜承载力、最大油膜压力随之增大;随着间隙比的增大,油膜承载力呈非线性减小,最大油膜压力近似线性增大。Under the condition of high speed,heavy load or large radial clearance,the plain journal bearings are often accompanied by change of lubricating oil flow state,rise in oil temperature and elastic deformation of half-bearings,which have great influence on operating stability of the bearings.A lubrication simulation model coupling multiple factors such as turbulence,thermal effect and elastic deformation is established by combining finite difference method and finite element method.The distribution of oil film pressure and oil film thickness of the bearings is analyzed under turbulent state,and the variations of load capacity and maximum oil film pressure of the bearings with eccentricity,rotational speed and clearance ratio are discussed.The results show that under high Reynolds numbers,the turbulent effect affects the distribution of oil film pressure and oil film thickness,decreasing the maximum oil film pressure and eccentricity,and increasing the minimum oil film thickness and deflection angle;with the increase of rotational speed and eccentricity,the load capacity of oil film and maximum oil film pressure increase;with the increase of clearance ratio,the load capacity of oil film decreases nonlinearly,and the maximum oil film pressure increases approximately linearly.

关 键 词：滑动轴承 雷诺数 紊流 最小油膜厚度 承载力 仿真模型 

分 类 号：TH133.31[机械工程—机械制造及自动化]