NUMERICAL ANALYSIS OF THE INFLUENCE OF THE TIP CLEARANCE FLOWS ON THE UNSTEADY CAVITATING FLOWS IN A THREE- DIMENSIONAL INDUCER-中国Betway体育网页登陆

摘要 Toclarifytheinfluencesofthetipclearanceflowsontheunsteadycavitatingflow,thethree-dimensionalunsteadycavitatingflowsthroughboththetwo-dimensionalcascadesandthethree-dimensionalinducerwithandwithouttipclearanceareperformednumerically.ThegoverningequationsforthecompressiblefluidflowwiththeDESturbulencemodelareemployedwiththeassumptionoftheisentropicprocessofliquidphase.Theevolutionofcavitiesisrepresentedasthesource/sinkofvaporphase.Thebasicequationsinthecurvelinearcoordinatearesolvedbythefinitedifferencemethod.Astheresultsofthethree-dimensionalcavitatingflowsthroughthetwo-dimensionalcascades,thetipclearanceflowsfromthepressuresidetothesuctionsideofthebladeproducesthetipvortexcavitation,whichaffectsthesheetcavitationontheleadingedgeofthenextbladeandenhancestheblockageeffectnearthecasingthantheflowswithouttipclearance.Ontheotherhand,inthecaseofthethree-dimensionalinducer,thelargebackflowcavitationisobservedaroundtheinletoftheinducer,wherethecavitiesaredevelopedonthecasingbythetipclearanceflows.Thelargepressuregradientbetweenthenon-cavitatingpressuresideandthecavitatingsuctionsideenhancesthetipclearanceflows.Thecalculationconsideringthetipclearancereproducesthedevelopedcavitationregionsimilartothatofexperimentalvisualizations.Additionally,thebackflowcavitationrotateswiththespeedslowerthantherotationspeedoftheinducer.Then,therotationofbackflowcavitationcausestheperiodicfluctuationoftheoutletpressuregreaterthanthatoftheinletpressure.

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NUMERICAL ANALYSIS OF THE INFLUENCE OF THE TIP CLEARANCE FLOWS ON THE UNSTEADY CAVITATING FLOWS IN A THREE- DIMENSIONAL INDUCER

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