滑动轴承中不规则表面微结构对空穴现象的影响  

Influence of Irregular Surface Microstructure on Cavitation Phenomenon in Sliding Bearings

作　　者：覃哲 邹爱成 QIN Zhe;ZOU Aicheng(College of Mechanical and Electrical Engineering,Guilin University of Aerospace Technology,Guilin 541004,China)

机构地区：[1]桂林航天工业学院机电工程学院,广西桂林541004

出　　处：《轴承》2022年第5期24-29,共6页Bearing

基　　金：广西自然科学基金资助项目(2016GXNSFBA380230)。

摘　　要：提出一种研究轴承中不规则表面微结构对空穴现象影响的新方法。首先,由MATLAB程序生成轴承曲面的点云数据;然后,基于生成的点云数据采用逆向成形的方式重构出带有不规则表面微结构的轴承曲面,利用重构的轴承曲面及COMSOL Multiphysics中“CFD模块”提供的“薄膜流体,壳”接口,通过求解狭窄结构的流体雷诺方程来模拟轴承中的油膜流动;最后,得出润滑油膜的空穴区域及油膜压力分布。使用该方法研究滑动轴承中深度为1~40μm不规则表面微结构对空穴现象的影响,结果表明:等转速、等载荷工作条件下,随着轴承中不规则表面微结构深度的不断增大,轴承楔形空间两侧油膜的流速差与外载荷平衡的油膜压力、空穴区域内油膜的流体质量分数均不断增大,而轴承油膜中产生的空穴现象会逐渐减少。A new method is proposed to study the influence of irregular surface microstructure on cavitation phenomenon in sliding bearings.Firstly,the point cloud data of bearing surface is generated by MATLAB program.Then,based on generated point cloud data,the reverse forming way is adopted to reconstruct the bearing surface with irregular surface microstructure,the reconstructed bearings surface and “thin-film fluid,housing” interface provided by “CFD Module” in COMSOL Multiphysics is used,the oil film flow in the bearings is simulated by solving the fluid Reynolds equations for narrow structure.Finally,the cavitation area of lubricating oil film and pressure distribution of oil film are obtained.The method is used to study the influence of irregular surface microstructure with a depth of 1~40 μm on cavitation phenomenon in the bearings.The results indicate that:under working conditions of same rotational speed and same load,with the continuous increase in depth of irregular surface microstructure,the flow rate difference of oil film on both sides of bearing wedge space,oil film pressure balanced with external load and fluid mass fraction of oil film in cavity area will all increase,while the cavitation phenomenon generated in bearing oil film will gradually decrease.

关 键 词：滑动轴承 微结构 空穴 动压油膜 压力 质量分数 

分 类 号：TH133.31[机械工程—机械制造及自动化]