计及润滑流体热效应的高速静压滑动轴承性能分析

ANALYSIS OF HIGH SPEED HYDROSTATIC BEARING'S PERFORMANCE CONSIDERING THERMAL EFFECT OF LUBRICATION FLUID

为了研究高转速下润滑流体特性对静压滑动轴承润滑性能的影响,通过考虑热效应下润滑流体的黏度、密度和比热容来对轴承性能进行分析,提出了一种结合自定义函数程序来引入润滑流体热效应关系求解纳维-斯托克斯(NS)方程的方法。以某高速滑动轴承为例,计算分析了润滑流体各个因素对轴承性能的影响,最后与不计及润滑流体特性的情况进行了对比。计算结果表明,计及润滑流体热效应的油膜特性分布,随着温度分布的不同而有显著的变化;黏度对轴承性能参数起关键性的作用,但是在考虑热效应下,密度对最大油膜压力有一定的降低作用,而比热容对最大油膜温度和轴颈摩擦功耗的影响较大,综合考虑才更符合实际工况。计算结果对研究热效应下油腔结构对流体特性的影响以及润滑油的选择等有指导意义。

To study the influence to high speed hydrostatic bearing＇s performance from lubrication fluid characteristics of oil film,the thermal effect of lubricating fluid＇s viscosity,density and specific heat capacity is considered,and put forward a method to solve the Navier-Stokes（ N-S） equations combined with a custom function program to introduce lubricating fluid relations under thermal effect. Take a fast sliding bearing as example,using this method to calculate and discuss the effect of various factors on the bearing performance,the performance parameters of bearing are compared with the situation of ignoring lubricating fluid features. Results show that the numerical distribution of the oil-film fluid properties have a significant change with the temperature as considering the lubrication fluid characteristics under thermal effect; Viscosity play a critical role on performance parameters of the bearing,while considering thermal effect,the density has a certain lower effect on oil-film maximum pressure,and the specific heat has capacity to influence the maximum temperature and friction power consumption of the shaft neck,so comprehensive consideration of lubrication fluid features is more in line with the actual working condition. The research results have guidance on the study of oil reservoir structure on the influence of fluid properties and the choice of lubricating oil,etc.