狹小受限空間內(nèi)氣膜孔流量系數(shù)的數(shù)值模擬和實(shí)驗(yàn)研究.pdf

1、南京航空航天大學(xué)碩士學(xué)位論文狹小受限空間內(nèi)氣膜孔流量系數(shù)的數(shù)值模擬和實(shí)驗(yàn)研究姓名：胡博申請學(xué)位級別：碩士專業(yè)：工程熱物理指導(dǎo)教師：毛軍逵20081201南京航空航天大學(xué)碩士學(xué)位論文IIIAbstractExperimentsnumericalsimulationswerecarriedouttoinvestigatethedisgecoefficientCdoffilmoutflowinnarrowconfinedspacewhicht

2、heratioofthecoolingchannelheighttothediameteroffilmcoolinghole(hd)wassmallerthan1.FirstlythedimensionlessequationofCdinnarrowconfinedspacewasgottenusingdimensionlessanalysis.themainlyparameterswereachievedwhichsupervised

3、theexperimentssimulationsinthispaper.Inexperimentsthermocouplesmicromanometerequipmentshighprecisionvtexflowmeterswereappliedtomeasuretemperaturepressureflowrate.TherulesofdisgecoefficientCdvaryingwiththefilmcoolingholeR

4、eynoldsnumberReblowingrateMdimensionlessoffilmcoolingchannelheighthdwerestudiedindetailthesimilaritycriteriafdisgecoefficientsCdvaryingwiththeseparameterswereconcluded.Theexperimentalresultsshewthatthefilmcoolingholedisg

5、ecoefficientCdincreasedwiththefilmcoolingholeReynoldsnumberRewhenthemainflowReynoldsnumber∞RewasconstantbutCdbecamesmallerwiththemainsteamReynoldsnumber∞ReincreasingifRewasconstant.InthedeterminedfilmcoolingholeReynoldsn

6、umberRecasesCdincreasedwiththeblowingrateMrisingespeciallywhenMwassmallerthan1.CdincreasedfaintlywhenMwasfarbeyond1.ItwasalsofoundinexperimentsthattheCddecreasedwithdimensionlessoffilmcoolingchannelheighthdincreasingespe

7、ciallyinthecaseswhichthefilmcoolingholeReynoldsnumberwaslargerthan9500.BesidestheexperimentsnumericalstudieswereappliedtoinvestigatethefilmcoolingholedisgecoefficientCdwithexperimentalboundaryconditionsbyCFDsoftwareFLUEN

8、T.Thenumericalresultsfittheexperimentaldataaboveverywell.BasedonthecertificatedsimulationgridnumericalmodelfurthercalculationswerecarriedtostudyCdtheacteristicsoftheflowaroundfilmcoolingholesvaryingwithRehdMinnarrowlimit

9、edspaces.NumericalResultsshewthatthefilmcoolingholedisgecoefficientCdincreasedwiththeblowingrateMespecialwhenMwassmallerthan1.UnderthesameblowingrateMconditionsCddecreasedweenywiththeReincreasing.Theresultsalsoindicatedt

10、hattheCdwassensitivetohditdecreasedgreatlywhenthehdwassmallerthan0.75.Alltheresultsaboveindicatedthatbecauseofthenarrowconfineddistancethewallofthecoolingchannelaffectedtheacteristicsoftheflowaroundfilmcoolingholesgreatl