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1、ThermalDesignofLEDLuminairesBasedonMulti-physicsProblemAnalysisAbstract:ThreeLEDlamps,whichrespectivelyare28WLEDheadlamp,18WLEDstreetlamp,12WLEDindoorlamp,werechosenasobjectsofstudyinthispaper.CombinedwithANSYS,EFD,andtheirdifferentcharacteristics,Multi-physicst
2、heorywasappliedtodesignheatdissipationoftheLEDlampsanditsdrivecircuit.Themaincontentsofthispaperareasfollows:(1)Aheat-sinkwithbothverticalfinsandhorizontalfinswasdesignedfortheLEDheadlamp.Comparedwithtraditionalextrudedheatsink,thisstructurecouldmakefulluseofthe
3、windtakeninfromthetwosidesofthecartoachievebettercoolingeffect.(2)DesignthoughtabovewasexpandedthentodesignanewstructureforLEDstreetlamp,whichcombinedtheadvantageofextrudedheat-sinkandpin-finheat-sink.Resultsshowthat,comparedwithtraditionalextrudedheatsink,thene
4、wstructuremadethehighesttemperaturerisedropby16.4℃andthehighestvelocityriseby1.29m/s.Optimizationwasprocessedthentoparametersofradius,distributionandoffset.Andeffectofwindspeedanddirectiontoheatdissipationwasstudied.(3)Byusingimageprocessingandcurvefittingtechno
5、logy,heat-sinkwithcurved-shapedfinsandinclinedfinsweredesignedforLEDindoorlamp,whichcouldachieveuniformdistributionoftheheatflowfield.Theresultshowsthat,comparedwithtraditionalextrudedheatsink,thecurved-shapedonecouldmakethehighesttemperaturedecreased,withmorefl
6、owfluidmovingfaster,andthattheinclinedone,whosestructurewasmoresimple,couldmaketheheatflowfieldbecomemuchmoreuniform-distributed.Afterthat,orthogonaltestwasprocessedtostudytheangleofinclinationofthefins.(4)Experimentcontrastwasprocessedtoheat-sinkwithinclinedfin
7、s,inwhichitscoolingeffectwasvalidated.AndsimulationcontrastexperimentIIIwasdone,byusingsinglefieldanalysisandcoupledfieldanalysis,respectively,toindoorLEDlampofheatsinkwithinclinedfins,validatingadvantageofcoupledfieldanalysis.(5)Applicationofheatpipeandmicro-ch
8、annelwithnanofluidsintheLEDheadlampandstreetlampwasstudied.Thesedesignstaketheheattotheopeninganddissipatedittogether,makingthehighesttemperaturerisedecreasedsignific
