混合流润滑条件下的水润滑橡胶轴承的润滑特性  

Lubrication Characteristics of Water-Lubricated Rubber Bearings in Mixed-Flow Lubrication

作　　者：杜媛英 李明[1] 刘刚[1] 李自刚[1] 侯高强[1] DU Yuanying;LI Ming;LIU Gang;LI Zigang;HOU Gaoqiang(College of Science,Xi’an University of Science and Technology,Xi’an 710054,China;College of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]西安科技大学理学院,西安710054 [2]兰州理工大学能源与动力工程学院,兰州730050

出　　处：《西安交通大学学报》2020年第9期49-57,共9页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(11972282);陕西省自然科学基金重点资助项目(2018JZ1001)。

摘　　要：针对水润滑橡胶轴承在混合流态下的润滑问题,基于层流、湍流经典润滑理论建立了水润滑橡胶轴承混合流态下的润滑方程,采用有限差分法分析了混合流润滑下的雷诺数、水膜厚度、衬层变形及水膜压力随偏心率、转速和长径比的变化规律,并将层流、湍流和混合流3种润滑流态下计算得到的润滑特性进行了对比分析。结果表明:混合流润滑方程比层流和湍流润滑方程更适合水润滑橡胶轴承的实际运行工况,混合流润滑下的水膜厚度、衬层变形和水膜压力的取值范围均处在层流润滑和湍流润滑之间;在混合流润滑下,雷诺数在承压区随偏心率的增大而减小,同时随转速的增加而增大;水膜厚度随偏心率的增大而减小,随转速和长径比的增大而增大;偏心率对最大衬层变形的影响最大,转速的影响次之,长径比的影响最小;水膜压力在承压区随着偏心率、转速和长径比的增加均增大。此研究可为准确分析水润滑橡胶轴承实际运行工况下的润滑特性提供参考,也可为计算流体动力学(CFD)仿真水润滑轴承润滑机理的研究提供依据。To study the lubrication characteristics of water-lubricated rubber bearings(WLRBs)in mixed-flow state,based on the classical laminar flow and turbulent lubrication theory,the mixed flow lubrication equations were established for WLRBs.Adopting the finite difference method,the variations of Reynolds number,water film thickness,liner deformation and water film pressure with eccentricity,rotational speed,and length to diameter ratio under mixed-flow lubrication were investigated,and the lubrication characteristics in three different lubrication states of laminar,turbulent and mixed flows were studied.The results show that the mixed-flow lubrication equations are more suitable for the actual operating conditions of WLRBs than the laminar and turbulent theories.For the mixed-flow lubrication,the value ranges of water film thickness,liner deformation and water film pressure are all between that of laminar and turbulent lubrications.For the mixed-flow lubrication,the Reynolds number decreases with the eccentricity in the pressure-bearing zone but increases with the rotational speeds;the dimensionless water film thickness decreases with the eccentricity,and increases with the rotational speed and the length to diameter ratio.The eccentricity has the biggest influence on the maximum liner deformation,followed by the rotational speed,and the smallest influence is the length to diameter ratio.The film pressure increases with the eccentricity,the rotational speed and the length-to-diameter ratio in the pressure-bearing zone.This study may provide reference for the accurate analysis on the lubrication characteristics of WLRBs under actual operating conditions,and also provide a basis for the simulation research via computational fluid dynamics(CFD)on lubrication mechanism of WLRBs.

关 键 词：水润滑橡胶轴承 混合流润滑 雷诺数 衬层变形 水膜压力 

分 类 号：TG156[金属学及工艺—热处理]