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1、TheeffectoffanswirltoPSUcoolingAuthor：Mr.JimmyLi—SeniorEngineerCompany：EmersonNetworkPowerCo.Address：No.1KefaRoad,Science&IndustryPark,NanshanDistrict,Shenzhen,ChinaZipcode：518057Phone：+86755-86011030Fax：+86755-86011064E-mail：jimmy@emersonnetwork.com.cnThee
2、ffectoffanswirltoPSUcoolingEmersonnetworkpowerco.JimmyLiAbstract:Baseonaactualcase,ThispaperuseFlothermsoftwarepackageofFlomericstoanalysistheeffectoffanswirltoPSU(PowerSupplyUnits)cooling.Throughtheanalysis,providetherelationshipbetweenthefanswirldirection
3、andflowfieldinoutlet,ThepaperalsoprovideasolutiontoavoidthiseffectinPSUthermaldesign.Keyword:FanswirlFlowfieldComponentcoolingSolution1.ForewordInelectricandelectronicindustry,forced-aircoolingapplywidelybecausetheexistenceoflotspowerdissipationcomponents.S
4、incetheproduct’scharacteristicandmainworkingenvironment,axialfanusedwidelyinforced-aircoolingscheme.Axialfanisdrivedbyamotor.Themotorrotatethefanbladeinagivenrpmbymotoritself.Withtherotationofblade,thefanprovideapressuredropbetweentwosideofblade.Andpropelth
5、eairnearbyflowsinadirectionofmotorhub.Theaxialfanhavethecharacteristicssuchaslowpressureheadandlargeflowrateetc.becausethesecharacteristicsandusuallyjustbecausethesecharacteristics,peopleusedaxialfan,andpeopleignoredmanyeffectsbringbytheswirledblades.Infact
6、airnotonlyflowsinthedirectionofhubbutalsohavethevelocityvectorinthetangentdirectionofblades.Airflowsinthedirectionofhubwithswirlactually.Intheoutletofaxialfan,airflowslikethefigshowsbelow:TangentdirectionActualflowdirectionAxialdirectionFig1Theactualflowdir
7、ectionintheoutletofaxialfanAsithassaid,theairthroughtheaxialfanflowwithswirl,.Whateffectswillappliedtotheflowfield(ThecooledareainsidethePSU)?Thispaperwilldiscussthisproblemwithaactualcase,andapplywithflothermsoftwarepackage.Describedeffectsofaxialfanswirld
8、irectionapplytotheflowfieldintheoutlet.Alsogivewaysthathowtoavoidtheseeffectoruseit!2.SimulationmodelThefigbelowarethethermaldesignsimulationmodelofPSUFig2thesimulationmodel(1)Fig3simulationmodel(2)Aft
