旋滑工况下非牛顿椭圆接触热弹流润滑问题数值分析  

Numerical Analysis of Thermal EHL Problem of Non-Newtonian Elliptical Contact under Spinning-Sliding Condition

作　　者：李伟 刘晓玲 龙涛 郭峰 LI Wei;LIU Xiaoling;LONG Tao;GUO Feng(School of Mechanical&Automotive Engineering,Qingdao University of Technology,Qingdao Shandong 266520,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,山东青岛266520

出　　处：《润滑与密封》2024年第10期1-8,共8页Lubrication Engineering

基　　金：国家自然科学基金项目(51475250)。

摘　　要：为了研究旋滑条件下润滑油膜热特性,基于Carreau流变模型,建立旋滑椭圆接触弹流润滑模型,求解旋滑热弹流数值解,比较等温及热条件下弹流润滑特性,并分析角速度、载荷、自旋因数及椭圆比对旋滑弹流特性的影响。结果表明:旋滑条件下油膜厚度明显减小,表明热效应不可忽略;角速度、载荷、椭圆比及自旋因数的增加均导致自旋效应增强,进而增加了油膜分布的不对称性;随着角速度的增大,静止固体与油膜温度增大,运动固体温度变化较小且呈先增后降趋势;随着最大赫兹压力增大,固体及油膜温度呈线性增加;自旋因数对油膜压力、膜厚及温度影响不大,但会增加膜厚及温度不对称分布;椭圆比只在特定范围内对旋滑弹流润滑特性产生影响。To evaluate thermal characteristics of lubricating film under spinning-sliding condition,a thermal elastohydrodynamic lubrication(EHL)elliptical contact model based on Carreau rheological model was established,and numerical solutions were obtained for a spinning-sliding EHL.A comparison of thermal EHL characteristics between isothermal and thermal conditions was carried out.Effects of the angular velocity,the load,the ellipticity and the spinning factor on the spinning-sliding EHL were analyzed.Results show that,thermal effects cannot be neglected under spinning-sliding condition,which leads to thinner oil film.The increase in the angular velocity,the load,the ellipticity and the spinning factor enhances the spinning effect,which leads to the increase in asymmetry of oil film distribution.With the increase of angular velocity,the temperature of stationary solid and oil film increases,whereas the temperature of moving solid changes a little,increasing firstly and then decreasing.With the increase in the maximum Hertzian pressure,the temperature of solid and oil film increases linearly.The spinning factor has little effect on the film pressure,the film thickness and the temperature,however,it results in the asymmetric distribution of the film thickness and the temperature.The performance of the spinning-sliding EHL is affected by the ellipticity in a specific range.

关 键 词：旋滑 Carreau流变模型 热效应 弹流润滑 

分 类 号：TH117.2[机械工程—机械设计及理论]