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1、车用空调风扇的CFD模拟2007年8月6日-工程流体网ByJonghyunPark,AppliedTechnologyResearchDepartment,HyundaiMOBIS,KoreaDuringthedevelopmentofanewcar,moduledesignsarecommonlyusedtosimplifythemanufacturingprocessandminimizeproblemsoccurringduringtheassemblyofcomponents.AFrontEndModule(FEM)isonesuchautomotivecomponentcon
2、sistingofacoolingmodule(condenser,radiator,fan,andshroud),headlamp,bumper,andcarrier.ThecoolingmoduleisacorepartoftheFEMbecauseofitsroleintheairconditioningandenginecoolingsystems.Theacousticperformanceofthecoolingfanisimportantaswell,whenconsideringhumansensitivitytonoise.Velocity(left)andpress
3、ure(right)contoursonthemid-planeoftheradiatorfanGeometryoftheFEMcoolingfansandshroudClose-upviewofthecoolingmoduleThecomponentthatwasexpectedtobethemainnoisesourceintheFEMconsistsofaradiatorfanandacoolingfan,bothenclosedinashroud.Thepresentworkconsideredonlytheradiatorfanoperatingwiththecondense
4、rfanfixed.Condenserandradiatorheatexchangerswereincludedinthesimulation,althoughtheradiatorheatexchangertankwasnot.Three-dimensionallaserscanningequipmentwasusedtoobtainadigitalmodeloftheradiatorfan.Fromthelaserscanner,acloudofpointswiththecoordinatesoftheexternalsurfaceofthefanbladewasgenerated
5、.Theresultinggeometrywasusedtobuildahybridmeshofabout2millioncells.Therotationspeedofthefanwassetat1875rpm.Thisspeedwaschosensothattheperiodofonebladepassingwouldbeabout4msforconvenienceofcheckingthesimulationresults.Aporousmediawasusedtorepresenttheheatexchanger.Usingcharacteristiccurvesforthep
6、ressuredropvs.velocity,viscousandinertiallosscoefficientswerecalculatedandthenusedinthenumericalsimulationasboundaryconditions.Thecomputationaldomainconsistedofarotationalzonecontainingtheradiatorfan,andlargestationaryzoneselsewhere.Forsteady-statesimulations,themultiplereferenceframes(MRF)model
7、wasused,andforunsteadysimulations,theslidingmeshmodelwasused.Twopartitionwallsatthefrontandrearfacesoftheradiatorwereusedsothatairisdrawnintotheradiatorfanthroughtheheatexchanger.Beyondthefanandshroudregion,thecomputationald
