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ID:34069211
大小:17.78 MB
页数:79页
时间:2019-03-03
《基于微尺度效应的液体非接触式机械密封-研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、基于微尺度效应的液体非接触式机械密封研究II江苏大学硕士学位论文ABSTRACTLiquidnon-contactmechanicalsealisandwillbewidelyusedforitspotentialadvantagessuchaslessabrasion,lessenergyexhaustandlongerservicelife.However,theflowchannelofliquidnon-contactmechanicalsealbelongstomicroflow,andcurrentresearchesshowthatmicroscaleeffectsuch
2、asthedominantsurfaceforce,boundaryslip,surfaceroughnesswhichmaybeneglectedinmacroflowwouldhavegreatinfluenceontheflowinthemicrochannel.Nowstudiesonmicroscaleeffectofdrygassealhavebeenmadeprominentprogress,butowingtothecomplicationandspecializationofliquidflowinmicrochannel,therearchonmicroscalee
3、ffectofliquidnon-contactmechanicalsealisseldom.Sothepaperconductsapreliminarystudytosupporttheresearchandapplicationofhigh—performancemechanicalseal.Thedetailedcontentsandresultsareasfollows.Basedonmoleculardynamics,hydroneadsorptionondifferentsealsurfacearestudied.Theresultsshowthattheadsorptio
4、nenergyofhydroneongraphiteandcarborundumsurfaceisweak,SOitiseasytobringaboutslippagewhentheshearforcereachaenoughcriticalvalue.Underthesameopermionconditionandmountingposition,experimentalfrictiontorqueofsealingpaffswhichcontaingraphitemachtingcarborundumandnickel-cementedcarbidearetestedandanal
5、yzedtoexploretheboundaryslippageinmicrochannelofmechanicalseal.Thetestindicatesthatthefrictiontorqueofgraphiteringmatchingcarborundumislessthanthatmathingnickel-cementedcarbideunderthesameopermionconditionwhentheshaftspeedreachesabigenoughvalue,whichiscausedbyboundaryslippage.Analyzingtheapplica
6、tionscopeofdifferentboundaryslipmodelandtakingthespiralgrooveup—streampumpingmechanicalsealforexample,boundaryconditionisrevisedbasedonNavierlinearslipmodelandtheliquidfilmissolvedbyNavier-Stokesequationtoacquiretheslippageinflucingonopeningforce,frictiontorque,leakageandpressuredistribution.III
7、基于微尺度效应的液体非接触式机械密封研究Theroughnessmicrostructureisacquiredbyexperimentaltestingthesurfaceofsealrings.Takingthemicro—poresmechanicalsealforexample,two-dimensionrectangleroughnessunitisadoptedtoapproximatetheactualsurfaceroughne
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