耦合偶应力效应和湍流效应的轴承润滑研究

doi:10.3901/JME.2024.21.219

摘要/Abstract

摘要： 当前处理偶应力效应和湍流效应的综合影响时，未考虑二者之间的耦合作用。为了更准确地分析偶应力效应和湍流效应的综合影响，从润滑剂流动的动量方程出发，推导出考虑二者之间耦合效应的修正湍流Reynolds方程。与已有的非耦合模型方程相比，修正湍流Reynolds方程即耦合模型方程在相同的偏心率、偶应力参数和平均雷诺数下对轴承无量纲最大油膜压力的计算值偏小。同时，应用修正湍流Reynolds方程分析了不同偶应力参数和平均雷诺数下轴承的性能参数随偏心率的变化。结果发现，随着偏心率的增大，偶应力参数或平均雷诺数越大，轴承的无量纲最大油膜压力和无量纲承载力越大。同时，偶应力参数的变化对轴承的无量纲端泄流量无影响。此外，提出的修正湍流Reynolds方程不仅适用于径向滑动轴承，也适用于止推轴承和椭圆滑动轴承等高速动压润滑轴承。

关键词: 径向滑动轴承, 偶应力, 湍流, 耦合效应

Abstract: When dealing with the combined influence of the couple stress effect and the turbulent flow effect, the coupling effect between the two is not considered. To analyze the comprehensive influence of the couple stress effect and turbulence effect more accurately, the modified turbulence Reynolds equation considering the coupling effect between the two is derived from the momentum equation of lubricant flow. Compared with the existing uncoupled model equations, the modified turbulent Reynolds equation, the coupled model equation, has a smaller calculation value for the dimensionless maximum film pressure of the bearing under the same eccentricity ratio, couple stress parameters, and average Reynolds number. At the same time, the modified turbulent Reynolds equation was used to analyze the variation of bearing performance parameters with eccentricity ratio under different couple stress parameters and average Reynolds number. It was found that with the increase of eccentricity ratio, the larger the couple stress parameter or the average Reynolds number, the larger the dimensionless maximum film pressure and dimensionless load capacity of the bearing. At the same time, the change of the couple stress parameter does not affect the dimensionless side leakage of the bearing. In addition, the proposed modified turbulent Reynolds equation applies not only to journal bearings but also to high-speed hydrodynamic lubricated bearings such as thrust bearings and elliptical journal bearings.

Key words: ournal bearing, couple stress, turbulence, coupling effect

中图分类号:

TH117

朱少禹, 张向军, 孙军, 王大刚. 耦合偶应力效应和湍流效应的轴承润滑研究[J]. 机械工程学报, 2024, 60(21): 219-231.

ZHU Shaoyu, ZHANG Xiangjun, SUN Jun, WANG Dagang. Research on Lubrication of Journal Bearing Considering the Coupling Effect of Couple Stress and Turbulence[J]. Journal of Mechanical Engineering, 2024, 60(21): 219-231.

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