基于流固耦合的波箔动压气体轴承承载性能优化  

Optimization of Load-Carrying Capacity Performance of Bump Foil Dynamic Pressure Gas Bearing Based on Fluid-Structure Interaction

作　　者：李东东 贾晨辉[1] 张飞[1] 路艳辉 杨鲁强 LI Dongdong;JIA Chenhui;ZHANG Fei;LU Yanhui;YANG Luqiang(School of Mechanical and Electrical Engineering,Henan University of Science and Technology,Luoyang Henan 471003,China;Luoyang Bearing Research Institute Co.,Ltd.,Luoyang Henan 471039,China)

机构地区：[1]河南科技大学机电工程学院,河南洛阳471003 [2]洛阳轴承研究所有限公司,河南洛阳471039

出　　处：《润滑与密封》2024年第6期125-132,共8页Lubrication Engineering

基　　金：国家自然科学基金项目(51475142);河南省科技研发计划联合基金项目(225101610002)。

摘　　要：基于有限元软件Ansys Workbench,建立波箔动压气体轴承在可压缩流体介质中运动的有限元模型,采用6DOF动网格计算方法对轴承的运动状态进行流固耦合数值模拟,探讨不同转速和波箔片结构参数(波箔的长度比、高度以及厚度)对轴承承载性能的影响规律。结果表明:轴承气膜压力大小的分布与平箔片变形量的大小成对应关系,说明提出的流固耦合方法能很好地反映波箔动压气体轴承的润滑状态;随着转速的增大,轴承动压效应不断增强,承载力增大,且平箔片的结构变形不断增大,致使气膜压力的收敛区发生波动;随着波箔的长度比和波箔片厚度的增加,轴承承载力先快速增大后趋于稳定,而波箔片高度对承载力影响不大,表明适当增加波箔的长度比和波箔片厚度可以提高承载力。Based on the finite element software Ansys Workbench,the finite element model of the motion of the bump foil dynamic pressure gas bearing in the compressible fluid medium was established,and the fluid-structure coupling numerical simulation of the motion state of the bearing was carried out by using the 6DOF dynamic grid calculation method.The influence of different speed and bump foil structure parameters(length ratio,height and thickness of bump foil) on bearing performance was discussed.The simulation results show that the distribution of the bearing gas film pressure corresponds to the deformation of the flat foil,indicating that the proposed fluid-structure coupling method can effectively reflect the lubrication state of the bump foil dynamic pressure gas bearing.With the increase of rotational speed,the dynamic pressure effect of the bearing is enhanced continuously,the load-carrying capacity increases,and and the structural deformation of flat foil is increased,resulting in fluctuations in the convergence zone of gas film pressure.With the increase of the length ratio of the bump foil and the thickness of the bump foil,the load-carrying capacity increases rapidly at first and then becomes stable,while the height of the bump foil has little effect on the load-carrying capacity,indicating that the load-carrying capacity can be improved by increasing the length ratio of the bump foil and the thickness of the bump foil appropriately.

关 键 词：波箔动压气体轴承 流固耦合 波箔片结构参数 承载力 

分 类 号：TH133.35[机械工程—机械制造及自动化]