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1、TribologyInternationalVol.29,No.4,pp.291-297,1996Copyright01996EkvierScienceLtdPrintedinGreatBritain.Allrightsreserved0301-679X/96/$15.00+O.OOELSEVIER0301-679X(95)00043-7SCIENCEiLeakagefromlabyrinthsealsunderstationaryandrotatingconditionsH.A.El-Gamal*,T.H.AwadandE.SaberAlthoughtheleakagefl
2、owthroughlabyrinthsealsunderstationaryconditionshasbeenexaminedbymanyinvestigatorsareliablepredictionoftheeffectofvariouslabyrinthparametersonleakageratehasnotbeenreportedsofar.Thetheoreticalmodelsforthesealsproposedinmostofthepreviousliteratureprovidedresultswithconsiderabledifferencesandc
3、ontradictionsinsomecases.Thestructureofthelaminarincompressibleflowandtheperformanceofanumberofsealsofvariousshapesforbothstationaryandrotatingconditionsareinvestigatedinthispaper.Thetheoreticaltreatmentisbasedontheformulationofthree-dimensionalaxisymmetricmomentumandcontinuityequationsforl
4、abyrinthshapeshavingsmallheighttoradiusratioasisalwaysthecaseinturbomachinery,rotodynamicpumpsandmanyhydraulicdevices.Itisfoundinthispaperthatshaftrotationisonlybeneficialfortheup-the-stepseal,hasnoeffectongroovedshaftandgroovedcasingsealsandhasanadverseeffectonthedown-the-stepseal.Itisalso
5、foundthattheuseofasmallerclearancesizeattheentrancemakessomeimprovementintheperformanceofthegroovedshaftanddown-the-stepsealsdependingonthevalueoftheheighttowidthratiooftheseal.Copyright01996ElsevierScienceLtdKeywords:turbomachinery,seals,labyrinthseals,contactlessseals,lubricationIntroduct
6、ionrotationisofnoimportance2.8.ThefirstreliablepredictionmethodwasduetoStofPwhotreatedtheManyinvestigationstackledtheproblemofleakagecaseofturbulentflowthroughalabyrinthsealofthethroughlabyrinthsealsforturbomachinery.Variousgroovedshafttype.Hewasabletoshowhowmuchshapeshavebeendevisedandstud
7、iedexperimentallytheflowpatterninthelabyrinthisaffectedbythebyStocker?inordertoreducetheleakagerates.Manyratiooftheaxialleakagevelocitytotheshaftperipheralearlytheoreticaltreatmentstotheproblemwerespeed.ForthelaminarcaseEl-Gamalet~l.~-~werecarriedoutanda
