基于微尺度效应的液体非接触式机械密封研究

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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,andcurrentresearchesshowthatmicros

2、caleeffectsuchasthedominantsurfaceforce，boundaryslip，surfaceroughnesswhichmaybeneglectedinmacroflowwouldhavegreatinfluenceontheflowinthemicrochannel．Nowstudiesonmicroscaleeffectofdrygassealhavebeenmadeprominentprogress，butowingtothecomplicationandspecializationofliquidflowinmicroch

3、annel,therearchonmicroscaleeffectofliquidnon-contactmechanicalsealisseldom．Sothepaperconductsapreliminarystudytosupporttheresearchandapplicationofhigh—performancemechanicalseal．Thedetailedcontentsandresultsareasfollows．Basedonmoleculardynamics，hydroneadsorptionondifferentsealsurfac

4、earestudied．Theresultsshowthattheadsorptionenergyofhydroneongraphiteandcarborundumsurfaceisweak，SOitiseasytobringaboutslippagewhentheshearforcereachaenoughcriticalvalue．Underthesameopermionconditionandmountingposition，experimentalfrictiontorqueofsealingpaffswhichcontaingraphitemach

5、tingcarborundumandnickel-cementedcarbidearetestedandanalyzedtoexploretheboundaryslippageinmicrochannelofmechanicalseal．Thetestindicatesthatthefrictiontorqueofgraphiteringmatchingcarborundumislessthanthatmathingnickel-cementedcarbideunderthesameopermionconditionwhentheshaftspeedreac

6、hesabigenoughvalue，whichiscausedbyboundaryslippage．Analyzingtheapplicationscopeofdifferentboundaryslipmodelandtakingthespiralgrooveup—streampumpingmechanicalsealforexample，boundaryconditionisrevisedbasedonNavierlinearslipmodelandtheliquidfilmissolvedbyNavier-Stokesequationtoacquire

7、theslippageinflucingonopeningforce，frictiontorque，leakageandpressuredistribution．III基于微尺度效应的液体非接触式机械密封研究Theroughnessmicrostructureisacquiredbyexperimentaltestingthesurfaceofsealrings．Takingthemicro—poresmechanicalsealforexample，two-dimensionrectangleroughnessunitisadoptedtoapproxim

8、atetheactualsurfaceroughne