微型稀薄气体润滑多叶轴承的静态性能分析  

Analysis on Static Performances of Multileaf Rarefied Aerodynamic Microbearings

作　　者：吴垚[1] 郗文君 张彩丽[1] 刘言松[1] 曹巨江[1] WU Yao;XI Wenjun;ZHANG Caili;LIU Yansong;CAO Jujiang(College of Mechanical&Electrical Engineering,Shaanxi University of Science&Technology,Xi’an 710021,China;Energy Management Low Voltage Division,Schneider(Xi’an)Innovation Technology Co.,Ltd.,Xi’an 710075,China)

机构地区：[1]陕西科技大学机电工程学院,西安710021 [2]施耐德(西安)创新技术有限公司低压事业部,西安710075

出　　处：《轴承》2023年第10期16-23,共8页Bearing

基　　金：陕西省自然科学基础研究计划资助项目(2022JQ-002);陕西科技大学引进人才博士启动基金资助项目(2021BJ-11)。

摘　　要：微型多叶气体轴承作为微型涡轮发动机和微型燃气轮机等微型旋转机械的关键支承部件,其润滑性能的优劣对微流体设备高速可靠运转及输出额定功率至关重要。将兹曼稀薄效应修正模型引入可压缩雷诺方程中,利用有限差分法和松弛迭代法数值求解实现Poiseuille流量比、气膜厚度和气膜压力的同时收敛,得到不同瓦块分布位置和轴承参数下微型多叶气体轴承静态性能的变化规律,并与微型圆柱气体轴承进行对比。结果表明:预载荷系数(0.5)较大时,微型多叶气体轴承的局部气膜压力峰值高于微型圆柱气体轴承;随着轴颈转速和长径比的增加,瓦上承载微型多叶气体轴承的承载力大于瓦间承载,但偏心率对瓦间承载和瓦上承载的承载力则表现出相反的影响趋势;由于瓦间沟槽的泵吸作用,瓦间承载时的摩擦因数始终大于瓦上承载。As the key supporting components of micro rotating machinery,such as micro turbine engines and micro gas turbines,the lubrication performances of multileaf aerodynamic microbearings is important for guaranteeing high-speed reliable operation and rated power output of microfluidic devices.The modified Boltzmann rarefaction effect model is introduced into compressible Reynolds equation,and the Poiseuille flow ratio,gas film thickness and pressure are converged simultaneously by using finite difference method and relaxed iterative algorithm.The variety of static performances of the bearings under different pad distribution positions and bearing parameters are obtained,and its results are compared with that of cylindrical gas microbearings.The results show that:the peak value of local gas film pressure of multileaf aerodynamic microbearings is larger than that of cylindrical gas microbearings for larger preload factor(0.5);with the increase of journal speed and aspect ratio,the load capacity on pads of multileaf aerodynamic microbearings is larger than that between pads,but the influence of eccentricity on load capacity between and on pads has an opposite trend;due to pumping effect of grooves between pads,the friction coefficient of bearings with load capacity between pads is always larger than that of bearings with load capacity on pads.

关 键 词：滑动轴承 气体轴承 气体润滑 有限差分法 预载荷 气膜刚度 

分 类 号：TH133.31[机械工程—机械制造及自动化] O354[理学—流体力学]