渦流發(fā)生器在圓管管片式換熱器中的應(yīng)用研究.pdf

1、天津大學(xué)碩士學(xué)位論文渦流發(fā)生器在圓管管片式換熱器中的應(yīng)用研究姓名：張金鳳申請學(xué)位級別：碩士專業(yè)：工程熱物理指導(dǎo)教師：汪健生20070101ABSTRACTFintubeheatexchangersareemployedinawidevarietyofengineeringapplications，forexample，inallairconditioning，gasheatingequipmentandcondenser’etcInth

2、etypicalapplication，almost90percentofthermalresistanceisonthegassideoffintubeheatexchangersTherefore，theresearchonheattransferenhancementofgas—sideinsuchheatexchangershasbecomeanimportantprojectVortexgeneratorwhichiSonem

3、odeofpassiveheattransferenhancement，iSmorewidelyusedintheprocessofengineeringproductionNotonlybecauseitcanimprovetheefficiencyofheatexchangerandreducetheweightaswellasvolumeofequipments，butalsoitneedsnoextrapowerThepurpo

4、seofthispaperistoputvortexgeneratorintothefintubeheatexchanger，SOthatitcanreducethefinsidethermalresistanceandimprovetheheattransferefficiencyaswellOneunitofheattransferinthefintubeheatexchangerischosenasfoundationmodel，

5、whichissimplifiedasarectangularchannelwiththreerowsofcolumnAsmethodsofheattransferenhancementvortexgeneratorsaresettledonthefoundationmodelItprovesthatvortexgeneratorsCallchangethestructureofflowfield，reducethepoorheattr

6、ansferfieldandthenimprovetheoverallheattransferefficiencyTheStandardk一占TurbulenceModelisappliedrespectivelyOilthenumericalsimulationsoffoundationmodelandtherectangularchannelwithvortexgeneratorssettledThevelocityfield，th

7、etemperaturefield，thepressurefieldandthevorticityfieldarecontrastivelyanalyzedinthispaperThenthetwodifferentphysicalmodelsarenumericallysimulatedwithLargeEddySimulationTheinstantaneouscharacteristicsofflowfieldaleanalyze

8、dandthemechanismofheattransferenhancementofvortexgeneratorsisinduced，whichprovidetheoreticalfoundationforfutureengineeringapplicationKEYWORDS：FintubeheatexchangerVortexgenerators，HeattransferenhancementLargeeddysimulatio