离心泵CFX流场分析教程.ppt

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1、Workshop5CavitatingCentrifugalPumpIntroductiontoCFXIntroductionThePurposeofthetutorialistomodelcavitationinacentrifugalpump,whichinvolvestheuseofarotationdomainandthecavitationmodel.Theproblemconsistsofafivebladecentrifugalpumpoperatingat2160rpm.Thework

2、ingfluidiswaterandflowisassumedtobesteadyandincompressible.Duetorotationalperiodicityasinglebladepassagewillbemodeled.Theinitialflow-fieldwillbesolvedwithoutcavitation.Itwillbeturnedonlater.StartWorkbenchandsavetheprojectascentrifugalpump.wbpjDragCFXintot

3、heProjectSchematicfromtheComponentSystemstoolboxStartCFX-PrebydoubleclickingSetupWhenCFX-Preopens,importthemeshbyright-clickingonMeshandselectingImportMesh>ICEMCFDBrowsetopump.cfx5KeepMeshunitsinmClickOpenWorkbenchModifyingthematerialproperties:ExpandMate

4、rialsintheOutlinetreeDouble-clickWaterOntheMaterialPropertiestabchangeDensityto1000[kg/m3]ChangeDynamicViscosityto0.001[kgm^-1s^-1]underTransportPropertiesClickOKCreatingWorkingFluidsSettinguptheFluidDomainDouble-clickonDefaultDomainUnderFluidandParticleD

5、efinitions,deleteFluid1andthencreateanewFluidnamedWaterLiquidSetMaterialtoWaterCreateanothernewFluidnamedWaterVapourNexttotheMaterialdrop-downlist,clickthe“…”icon,thentheImportLibraryDataicon(ontherightoftheform),andselectWaterVapourat25CundertheWaterData

6、objectClickOKBackintheMaterialpanel,selectWaterVapourat25CClickOKSettinguptheFluidDomainSettheReferencePressureto0[Pa]SetDomainMotiontoRotatingSetAngularVelocityto2160[revmin^-1]SwitchonAlternateRotationModelMakesureRotationAxisunderAxisDefinitionissettoG

7、lobalZSwitchtotheFluidModelstab,andsetthefollowing:TurnonHomogeneousModelintheMultiphasesectionUnderHeatTransfersettheOptiontoIsothermal,withaTemperatureof25CSetTurbulenceOptiontoShearStressTransportClickOKInletBoundaryConditionInsertaboundaryconditionnam

8、edInletOntheBasicSettingstab,setBoundaryTypetoInletSetLocationtoINLETSetFrameTypetoStationarySwitchtotheBoundaryDetailstabSpecifyMassandMomentumwithaNormalSpeedof7.0455[m/s]SwitchtotheFluidValuestabForWaterLiquid,se