卧式水电机组用径向滑动轴承热弹流特性分析

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1、2012年1月润滑与密封Jan．2012第37卷第1期IBRICAT10NENGINEERINGVo1．37No．1DOI：10．3969／j．issn．0254-0150．2012．01．014卧式水电机组用径向滑动轴承热弹流特性分析方静辉汪久根陈志祥(1．浙江富春江水电设备股份有限公司浙江杭州310013；2浙江大学机械工程学系浙江杭州310027)摘要：研究轴颈挠度和瓦块表面热弹变形对卧式水电机组径向滑动轴承静态润滑性能的影响。推导考虑轴颈挠度和轴瓦热弹变形后的油膜厚度表达式；用中心差分法结合ANSYS软件联立求解雷诺方程、能量方程、固体热传导方程、密度方程、黏度方程和轴瓦热弹变形等，得

2、到径向滑动轴承的热弹流润滑(TEHD)特性，并与不计入轴颈挠度及轴瓦热弹变形的油膜动压润滑特性进行比较。结果表明：在考虑轴颈挠度和轴瓦瓦面热弹变形的影响后，油膜压力、温度、厚度沿着轴承宽度中心线的对称特性消失；油膜压力峰值增大，峰值点位置由轴向中心区偏移至出口区；油膜温度峰值增大，最高温度发生在出口区；润滑区内的最小油膜厚度大幅度减小，油膜最小厚度处于出口侧边界附近；轴承润滑流量减小，损耗略有增大；轴承稳态运行时，轴颈偏位角基本一致。关键词：径向滑动轴承；热弹流；轴颈挠度；轴瓦；热弹变形中图分类号：TH133．31；TH117．2文献标识码：A文章编号：0254—0150(2012)1—056

3、—6ThermalElastohydrodynamicLubricationPerformanceofJournalBearingforBulbTypeHydraulicPowerUIlitFangJinghui‘WangJiugenChenZhixiang(1．ZhejiangFuchunjiangHydropowerEquipmentCo．，Ltd．，HangzhouZhejiang310013，China；2．DepartmentofMechanicalEngineeringofZhejiangUniversity，HangzhouZhejiang310027，China)Abstrac

4、t：Theeffectsofshaftdeflection，elasticdeformationandthethermaldistortionofpadfaceonthethermalhydro—dynamicperformanceofjournalbearingsforbulbtypehydraulicpowerunitswereanalyzedwithfullnumericalsolution．Thefilmthicknessequationconsideringtheshaftdeflection，elasticdeformationandthermaldistortionofpadfa

5、cewaspro-posed．TheReynoldsequation，energyequation，solidheattransferequation，densityequation，viscosityequation，elasticde—formationofthepadandthermaldistortionofthepadfaceweresolvedwithnumericalsimulationandsoftwareANSYS，thethermalelastohydrodynamiclubrication(TEHD)performancesofthejournalbearingswere

6、obtained，andcomparedwiththeresultswithoutconsiderationoftheshaftdeflectionanddeformationofthepadface．Theresultsshowthatwhenconsideringtheshaftdeflectionanddeformationofthepadface，thesymmetryofhydrodynamicpressure，temperaturedistribution，mini·mumfilmthicknessbythemiddlelineoftheguidebearingisdisappea

7、red；themaximumpressureisincreased，thelocationofthemaximumpressuremovesfromthemiddlelineoftheguidebearingtotheboundaryofthebearing；theoiltempera—tureisincreased，thelocationofthemaximumtemperaturepointi