悬臂止推箔片轴承三维流-固-热耦合数值分析  

3D Thermal-Elasto-Hydrodynamic Numerical Analysis of Multi-Leaf Gas Foil Thrust Bearing

作　　者：赵琪 强铭琛 侯予[1,2] 陈双涛[1,2] 赖天伟[1,2] ZHAO Qi;QIANG Mingchen;HOU Yu;CHEN Shuangtao;LAI Tianwei(School of Energy and Power Engineering,Xi’an Jiaotong University,Shaanxi Xi’an 710049,China;MOE Key Laboratory of Cryogenic Technology and Equipment,Xi’an Jiaotong University,Shaanxi Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]西安交通大学深低温技术与装备教育部重点实验室,陕西西安710049

出　　处：《摩擦学学报》2023年第11期1361-1369,共9页Tribology

基　　金：国家重点研发计划项目(2022YFB3402700);陕西高校青年创新团队项目资助。

摘　　要：工作温度是影响轴承性能关键因素之一,为了深入分析轴承气膜温度变化对箔片轴承承载特性的影响,本文中建立了考虑冷却气实际流动特性的悬臂止推箔片轴承三维流-固-热耦合模型,研究了轴承间隙、转速以及冷却气流速变化时悬臂箔片轴承气膜压力场和温度场等的变化规律.研究结果表明:随着轴承间隙减小以及轴承转速增大,气膜表面温度逐渐升高,其中气膜高压区温度上升更快,气膜温度与轴承间隙呈现线性变化趋势,气膜温度与转速呈现非线性增长的趋势,相比于轴承间隙,轴承转速升高对润滑气膜温度场影响更大,气膜温度过高可能会造成轴承热失效,因此需要深入研究工作温度对轴承性能的影响;随着冷却气流速增大,轴承承载力和气膜温度逐渐减小.冷却气流速增大到一定程度时,降温效果不再发生明显变化.Gas foil bearings have many advantages such as low cost,non-pollution,high speed,high stability,etc.,which are widely used in high-speed turbo machines.In order to meet the demands of higher power density rotating machinery,gas foil bearings usually work at high-speed condition.At this time,due to the high-speed shear dissipation of heat generated by the viscosity of the gas,the bearing operating temperature rises rapidly.Without timely heat evacuation,the lubricating gas film temperature is too high,which may lead to bearing thermal failure and other problems.Therefore,the thermal analysis and the load carrying capacity characteristics of foil bearings are very important in the bearing performance study.Deformation of the foil affects the flow of gas in the lubricating gas film.In turn,the pressure of the gas film interacts with the foil.There is a complex fluid-solid coupling relationship involved.In addition,the heat generated by the viscous shear of the lubricating gas in the gas film affects the physical properties of the gas and the foil.Therefore,it is essential to establish a three-dimensional thermal-fluid-structure coupling model of foil bearings to analyze the performance of bearings.In order to deeply analyze the influence of gas film temperature on the load-bearing characteristics of foil bearings,a three-dimensional flow-solid-thermal coupling model of the multi-leaf foil bearing was established considering the actual flow characteristics of the cooling air using the finite element commercial software COMSOL in this paper.The effects of thermal conductivity in the circumferential and radial directions of foils,and the actual flow characteristics of the cooling gas were considered.The accuracy of the numerical model was verified by comparison with experimental results.The load carrying capacity characteristics of the foil bearing under the conditions of variable bearing clearance and variable rotational speed were analyzed.The pressure and temperature distribution of lubricating gas film as well as t

关 键 词：气体轴承 悬臂轴承 流-固-热耦合 承载特性 热特性 

分 类 号：TH133.36[机械工程—机械制造及自动化]