新型大功率led灯散热器开发及散热特性研究

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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