剪切稀化对径向滑动轴承润滑特性的影响

doi:10.3901/JME.2020.01.100

机械工程学报 ›› 2020, Vol. 56 ›› Issue (1): 100-109.doi: 10.3901/JME.2020.01.100

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剪切稀化对径向滑动轴承润滑特性的影响

裴世源, 郑文斌, 洪军

西安交通大学现代设计与转子轴承系统教育部重点实验室西安 710049

收稿日期:2019-02-05 修回日期:2019-08-15 出版日期:2020-01-05 发布日期:2020-03-09
通讯作者: 裴世源(通信作者),男,1983年出生,博士,副研究员。主要研究方向为滑动轴承与转子动力学。E-mail:peishiyuan@xjtu.edu.cn
作者简介:洪军,男,1968年出生,博士,教授,博士研究生导师。主要研究方向为精准数字装配理论与技术、高性能数控机床数字化设计与制造技术。E-mail:hongjun@xjtu.edu.cn
基金资助:
国家自然科学基金资助项目（51605367，51975456）。

Influence of Shear-thinning Effect on the Characteristics of Journal Film Bearing

PEI Shiyuan, ZHENG Wenbin, HONG Jun

Key Laboratory of Education Ministry for Modern Design and Rotor-bearing System, Xi'an Jiaotong University, Xi'an 710049

Received:2019-02-05 Revised:2019-08-15 Online:2020-01-05 Published:2020-03-09

摘要/Abstract

摘要： 为研究润滑油的剪切稀化效应对径向滑动轴承性能的影响，考虑剪切稀化、紊流、质量守恒边界建立了轴承的热流体动力学润滑分析模型，采用有限元法求解了其润滑性能，通过对比理论与试验结果验证了理论分析模型的正确性，分析了不同转速、载荷和进油温度下剪切稀化对轴承润滑性能的影响规律（油膜厚度、油膜压力、温升、功耗、流量等），探讨了温度计算模型对剪切稀化效应的适用性。结果发现，剪切稀化效应对轴承润滑特性具有重要影响，其作用强弱与载荷和转速等条件强烈相关；轻载工况剪切稀化对轴承润滑特性体现为正面作用，重载工况体现为负面作用；发现温度计算模型对选用不当和定偏心计算是造成功耗等理论计算结果与试验之间存在较大偏差的两个主要原因。最后给出了工程上选用具有剪切稀化效应润滑油的适用工况与条件。

关键词: 剪切稀化, 非牛顿流体, 润滑特性, 热流体动力学

Abstract: The purpose of this paper is to study the lubricant shear-thinning effects on the film bearing performance. A thermal-hydrodynamic lubrication analysis model is presented, considering the shear-thinning effect, turbulent effect, and mass conserving cavitation boundary conditions. Then, the bearing performance is solved by finite element method. The correctness of the analytical model is verified by the comparison between the theoretical and existing experimental data. Under wide operating conditions, such as speeds, loads and oil supply temperatures, the effects of shear thinning on the lubrication performance, such as film thickness, film pressure, temperature rise, power consumption, flow rate, is systematically investigated. The applicability of the thermal model is discussed. It is showed that the shear thinning effect has important influence on the film bearing performance. The significance of the shear thinning effect is depending on the load and speed conditions. Shear thinning effects are improved the bearing performance in light load condition and deteriorate in heavy load condition. The thermal model is critical to correctly evaluate of shear thinning effects on the bearing performance, which is the reason that large deviation between theory and experiment was observed. Finally, the preferred working conditions for the lubricant with shear thinning effect is suggested.

Key words: shear thinning effect, non-Newtonian fluid, lubrication characteristic, thermohydrodynamics

中图分类号:

TP301

裴世源, 郑文斌, 洪军. 剪切稀化对径向滑动轴承润滑特性的影响[J]. 机械工程学报, 2020, 56(1): 100-109.

PEI Shiyuan, ZHENG Wenbin, HONG Jun. Influence of Shear-thinning Effect on the Characteristics of Journal Film Bearing[J]. Journal of Mechanical Engineering, 2020, 56(1): 100-109.

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剪切稀化对径向滑动轴承润滑特性的影响

Influence of Shear-thinning Effect on the Characteristics of Journal Film Bearing

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