考虑润滑油黏温效应的动压滑动轴承性能分析

滑动轴承的相关研究很多都基于等黏度的情况下,这与轴承的实际工作情况有较大的出入。使用计算流体力学FLUENT通过编写的黏温方程UDF程序进行动压滑动轴承润滑油黏度的计算,并考虑黏温效应对动压滑动轴承性能的影响,比较等黏度与变黏度情况下动压滑动轴承的油膜压力与承载力、油膜的轴向与周向温度分布。结果表明:在考虑黏温效应条件下,轴承的承载力、油膜压力、摩擦力均小于定黏度条件下,这是由于温度升高导致黏度降低,从而减小了油膜静压力和承载力;在轴承轴向方向上,从油膜中心位置向两端部,油膜温度逐渐升高;在轴承圆周方向上,从收敛区到发散区,油膜温度先升高后降低,油膜温度峰值出现在轴承发散区的端部位置。

Analysis of the Effect of Viscosity-Temperature Effect of Lubricating Oil on the Performance of Hybrid Bearing

Many related researches on journal bearings are based on the case of constant viscosity,which is quite different from the actual work of journal bearings.Computational fluid dynamics(CFD) FLUENT was used to calculate the viscosity of lubricating oil of hybrid bearing by UDF program of viscosity-temperature equation,and the effects of viscosity-temperature effect on the performance of hybrid bearing were analyzed.The oil film pressure and bearing capacity,the axial and circumferential temperature distribution of the oil film were compared under the conditions of constant viscosity and variable viscosity.The results show that under the condition of considering the viscosity-temperature effect,the bearing capacity,oil film pressure and friction are less than those under the constant viscosity condition.This is because that the decrease of viscosity due to temperature increase causes the decrease of static pressure and bearing capacity of oil film.In the axial direction of the bearing,the temperature of the oil film is increased gradually from the center of the oil film to the two ends.In the circumferential direction of the bearing,the oil film temperature is increased first and then decreased from the convergence area to the divergence area,and the peak value of the oil film temperature appears at the end of the divergence area of the bearing.