cfx 风扇pq性能曲线

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1、ImplementationofAxialFancurveAgendaMotivationImplementationExampleMotivationCommonlyaskedquestionsbothbysalesandcustomersIsthisoptionavailablewithinCFX?Arethereanyexamplesavailable?DetailedfangeometrynotavailableOnlyfanexternaldimensionsandfancharacteristicscurveavailableGivestheusersaeasy

2、wayofimplementingaFanBCatinletImplementationForinletaxialfansonLocalCartesiancoordinate;createdforeachBCCalculatesthetrailingedgevelocityprofile,basedonEulerequationElectronicsPackageElectronicsPackageImplementationBasedonEulerfandesignequationReducedequation:NoswirlenteringFaninletUserInp

3、utsUserinputs:Fancurve:staticpressureVs.FlowrateFanrotationalspeed:inrpmTipradiusModelassumptionsGeometry:CircularinletHubtipratio=0.4Hubradius=0.4*Tipradius–usercanchangeitFlow:NoflowattheinletbelowHubradiusNoswirlenteringfanFanEfficiency=66%-usercanchangeitCalculationssteps:Readinthestan

4、dardFancurveinformation:staticpressurevs.flowrateEvaluateSystemResistance,i.e.,pressuredropbetweeninletandoutletUsingSystemResistance:readtheflowratefromthefancurveCalculatemeridionalvelocity:Calculate:swirlvelocityAssume:radialvelocityCalculationsteps…Createlocalcoordinateframeatcentrethe

5、inletEvaluateannularregionoftheflow:StepfunctionbetweenRhubandRtipInletRtipRhubFlowregionNoflowCalculationsteps…CartesianVelocityspecified:Example:electronicscoolingPopulatedpcbFanOutletsReadFancurvedataCEL&CCLLIBRARY:CEL:EXPRESSIONS:#InputinformationfromtheuserFspeed=-2000[min^-1]Rtip=0.0

6、35[m]#AssumedvaluesHubTipratio=0.4FanEffn=0.66#GeometrycalculationRhub=HubTipratio*RtipFanArea=pi*(Rtip^2-Rhub^2)spanloc=step((r-Rhub)/1[m])*step((Rtip-r)/1[m])#CalculationsFanomega=Fspeed*2*pirho=massFlowAve(Density)@IninP=areaAve(p)@InOutP=areaAve(p)@OutdelP=abs(inP-OutP)#SystemResistanc

7、eFanQ=Fancurve(delP)#flowratereadfromtheFancurvedataU2=r*fanomega#BladeVelocity#CalculatingtheexitprofilefromtheFanCm=FanQ/FanArea#MeridionalVelocityCrad=0[ms^-1]#RadialVelocityCtheta=delP/(fanEffn*(U2+1[ms^-1])*rho)#SwirlVelocity#ConevrtingCylindricalvelocity