应力偶流体润滑轴承油膜压力和轴心轨迹计算  

Calculation of Oil Film Pressure and Axis Orbit for Journal Bearings Lubricated with Couple Stress Fluids

作　　者：马艳艳[1] MA Yanyan(Sino-German College,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学中德学院,上海200093

出　　处：《润滑与密封》2022年第12期112-116,共5页Lubrication Engineering

摘　　要：根据应力偶流体动态润滑轴承雷诺方程,运用数值计算方法研究应力偶参数对轴承润滑性能的影响。针对某柴油机轴承,分别计算采用牛顿流体和非牛顿应力偶流体润滑时的油膜压力分布和轴心轨迹。结果表明:与牛顿流体润滑相比,应力偶流体润滑时轴承的油膜压力增加,且随应力偶参数的增加,最大油膜压力出现在轴承角度增大的方向;2种润滑条件下,所计算得到的轴心轨迹形状类似,不同之处在于牛顿流体润滑时其轴心轨迹离轴承的中心比较远,而应力偶流体润滑条件下轴心轨迹随参数增加向其中心靠近且最小油膜厚度明显增大。研究表明,应力偶流体润滑与牛顿流体相比提高了油膜压力,改善了轴心轨迹,且应力偶参数越大应力偶效应越显著。The influence of couple stress parameters on the lubrication performance of dynamically loaded journal bearing was studied numerically based on Reynolds equation.The oil film pressure distribution and axis orbit of a certain type of diesel engine bearing were calculated under the lubrication conditions of Newtonian fluid and couple stress fluid respectively.The numerical results show that compared with Newtonian fluid lubrication,the oil film pressure of the bearing increases under the stress couple fluid lubrication,and the maximum oil film pressure appears in the direction of bearing angle increase with the increase of couple stress parameter.Under the two lubrication conditions,the shape of the axis orbit is similar,but the axis orbit is far away from the center of the bearing under the Newtonian fluid lubrication condition,while under the couple stress fluid lubrication condition,the axis orbit is closer to the center with the increase of parameters,and the minimum oil film thickness increases obviously.The research shows that compared with Newtonian fluid lubrication,couple stress fluid lubrication improves oil film pressure and axis orbit,and the larger couple stress parameter is,the more obvious couple stress effect is.

关 键 词：应力偶 滑动轴承 油膜压力 轴心轨迹 

分 类 号：TH113[机械工程—机械设计及理论]