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1、南京航空航天大学硕士学位论文ABSTRACTLEDlighthasbeenexpectedtodemonstrateitssuperiorityandgoodfunctionalperformanceinthefieldoflighting.LEDlighthasgreatadvantagesovertraditionallightduetoitshighluminousefficiency(about100lm/W),longservicelife,lowconsumption,andhighcontrollability.However,extrusionlimitsareexami
2、nedintermsofheatdissipationissuesforLEDlight.Forexample,thehigherpowerandintegrationcouldleadtoaseriesofproblems,i.e.Lumensdepreciation,lifeandreliabilityreduction.Inparticular,poorheatdissipationisthemainbarrierfortherequiredworkinglifeandreliabilityofLEDlight.Inthispaper,threefinsinkswithdiffer
3、entfin’sanglesaredesignedandmanufactured,andthebestinstallationanglehasbeenfound;anewtypecopperheatresourceisdesignedandapplied,sinksassembledwithcopperflatorflatheatpipearetestedbyareliableexperimentsystem,relatedthermalcharacteristicshavebeenacquired;anewtypesinkwithverticalheatpipeisdesigned,a
4、ndanoptimizeddesignmethodbysimulationisexplored,whichcanprovideamodelforfurtherexperimentalstudy.Themajorworkandresultsareasfollows:1.Threefinsinkswithdifferentfin’sanglesaredesignedandmanufactured,temperaturedifferenceswithsurroundedairareanalyzedbyexperimentandtheinfluenceofinstallationangleonh
5、eatdissipationperformanceisstudiedwhichcangotthebestinstallationangle;airflowbetweenfinswouldbeinterferencebydifferentdegreethatprovedbyairflowtheoryandconvectionheattransfercoefficientcalculatedbysimulation,whenfindirectionperpendiculartothehorizontal,bestheatdissipationwouldbecaughtduetothemore
6、smoothairflowandhigherconvectionheattransfer.2.Areliableexperimentsystemisestablishedwithanewtypecopperheatresourceaccordingtoone-dimensionalheatconductiontheory,thissystemwiththesimplestructurecanreplacetheLEDchiparraytogenerateheat,outputheatfluxpreciouslyandreducetheerrorcausedbychangeintheequ
7、ipment.3.ThreesinksassembledwithcopperflatorflatheatpipesareappliedintoLEDheatdissipation;temperaturedifferencebetweentestpointsareacquiredbytemperaturetestexperimentwiththesystem,temperatureuniformity,responsetimeandt