Star CCM+ 风机模拟

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1、UniversityofAppliedSciencesHTWBerlin,FB2Wilhelminenhofstr.75A,12459Berlin,GermanyThermo-&FluiddynamicsgroupProf.Dr.-Ing.StefanFranke-mail:stefan.frank@htw-berlin.deNumericalInvestigationsonthePerformanceCharacteristicofRadialFanswithForwardCurvedBladesbymeansofCFDManoochehrDarvish,StefanF

2、rankSTAREuropeanConference2011March22-23AgendaSiroccofanIntroduction◊Applications◊Advantages/Disadvantages◊CharacteristiccurvesModelparameters/ModelingphysicsCFDSimulationsoutlineRotationmodelingOverviewofthegeneratedmeshconfigurationsResults◊Characteristiccurves:CFDvs.Experiment◊Si

3、mulationtime◊Steadyvs.UnsteadysimulationsConclusions3CommonlyusedbladeshapesinRadialfans(withtheirmaximumattainableefficiencies)Keyfactorsforfantypeselection:◊Pressure◊Flowrate◊EfficiencyForwardcurvedRadial-TipbladesRadialbladesblades(65%)(70%)(60%)◊Noisegeneration◊Spaceconstraints◊Drive

4、configuration◊Cost◊...BackwardinclinedBackwardinclinedBackwardcurvedAirfoilblades(92%)blades(78%)blades(85%)4Siroccofanspecifications◊Largebladeangles◊Smallsizerelativetootherfantypes◊OperationatlowspeedslowlevelofnoiseFlowseparationbetweenthebladesLowefficiencyScrollhousingisrequired

5、Applications:−Automotiveindustry−HVACapplications5SiroccoFanPerformanceCurveBestEfficiencyPoint(BEP)RegionofInstabilityThrottleRangeOverloadRange6ModelParameters◊Fanwheelouterdiameter(D2):200mm◊Inner/Outerdiameter(D1/D2):0.8◊Numberofblades:38◊Rotorwidth:82mm◊Scrollhousingwidth:87mm◊Volute

6、openingangle(α):7°ModelingPhysicsIdealgasSegregatedflowMassInlet/PressureoutletRotationalspeed:1000rpmSteady-StateMovingReferenceFrame(MRF)RotorPositions:0°,3°,6°7CFDSimulationsoutlineRealizablek-εTurbulenceSSTk-ωmodelsSpalart-AllmarasSteady-state(MovingReferenceFrame)Polyhedral

7、CFDSimulationsMeshTrimmerConfigurationPolyhedral-TrimmerStructuredgridSSTk-ωUnsteady(RigidBodyPolyhedralMotion)8RotationofcomputationaldomainsRigidBodyMotion(RBM):ImplicitunsteadyPositionofthecellvertices:MovingInstantaneouslocalflowbehaviorTimeaccuratesoluti