新型大功率led灯散热器开发及散热特性研究

新型大功率led灯散热器开发及散热特性研究

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时间:2018-10-17

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1、ABSTRACTLED(1ight—emittingdiode),asthefourthgenerationoflightingsourceorgreenlightsource,havesomefeatures,suchasenergy-efficient,eco—friendly,durable,smallvolumeandSOon.EvenSO,ithasmanytechnicaldifficultiestobesolvedbeforereplacethetraditionallightingso

2、urcecompletely.Amongthem,theproblemofdissipatingheatisanimportantfactorinthedevelopmentofLED.Therefore,tosolvethedissipatingheatofLEDandproceedtheoptimizedresearchhasgreatrealisticsignificance.Firstofall,Istudyincylindricalradiatorintheconditionoflarges

3、pacenaturalconvection.Throughthestudyofthenumericalsimulationofcylindricalradiator,introducestheestablishmentofphysicalmodel,mathematicalmodel,computational鲥dandboundaryconditions.Istudythefinintervalofcylindricalradiatorandtheconditionoftheairflow,comb

4、inedwiththetheoreticalknowledgeofheattransfertheoryandtheresultsofnumericalsimulation.Resultsshowthatthereisastagnantareabetweenthefinsandthevelocityofairflowinthisareaisverylow,almostmotionless,itaffectstheareaofeffectiveheatradiatingarea.Theinternalof

5、finsaffectstheflowconditionofairbetweenthefins,andthereisaoptimumvalue,itCallmakestheradiatorworkinthemostefficientcondition.Sowecanoptimizethestructureoftheradiatorandchangtheintemaloffins,andthenimprovetheconditionofairflowbetweenthefinsandimprovetheh

6、eatdissipationefficiencyofradiatoLandmeetthedemandofheatdissipation.Secondly,onthebasisofoptimizingthestructureofcylindricalradiator,Istudytheprismaticradiatorbasedonthenumericalsimulation.Withoutchangingthegeometryoftheradiatorandthenumberoffins,tostud

7、ytheeffectsofvariousparametersontheheatdispersionoftheradiatorbychangingthefinspacingt,thefinthicknessdandtheheightofradiatorH.TheresultsshowthattheincreaseoftheinternaloffinsCanimprovetheheatdissipatingcapacity,butoverthecertainrange1II山东大学硕士学位论文willca

8、useadeclineinbuoyancyliftandwillbeunfavorabletothenaturalconvectionheattransfer,thustoselectareasonableinternalbetweenthefinsisnecessary.Comparedtoothergeometricparameters,theinfluenceofthethicknessoftheradiatorfinstoheatdispersi

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