冲击射流的PIV实验研究

183Vol.18,No.3200409ExperimentsandMeasurementsinFluidMechanicsSep.,2004:100723124(2004)0320068205PIV,,,(,100084):PIV10mm(2d3d6d8d),(1.21.51.82.02.32.8),:;PIV;:O358:APIVinvestigationofimpingingjetXIONGFei,YAOZhao2hui,HAOPeng2fei,XUHong2qing(DepartmentofEngineeringMechanics,TsinghuaUniversity,Beijing100084,China)Abstract:Inthispaper,usingPIVtechnology,investigationofimpingingjetwithdiameter10mmofout2letiscarriedoutatdifferentnozzle2to2platedistances(2d,3d,6d,8d)anddifferentpressureratios(1.2,115,1.8,2.0,2.3,2.8).Flowdistributionandvortexstructurehavebeenproperlysummarizedbyexperimen2talanalysisandimageprocessing.Somenewphenomenaandrulesarefound.Itcanbeareferenceforfurtherinvestigations.Keywords:impingingjet;PIV;vortexstructure0,:,,,PIV(ParticleImageVelocimetry),,2080,,,,,PIV:2003210227;:2004203210:(19902009;190305014):(19782),,,.:.,1PIV,11Fig.1Thesketchoftheexperimentalsetup:(1)PIVPIV,ICTYAG,,,500mm300mm,2mmKodakCCD(MegaplusES4.0,,20482048,NikonAFMicro2Nikon60mmfP2.8D)(MatroxGenesisGenPFP64P8PSTD)(),(2)2(10mm)d10mm,D30mm,h(),,(3)PIV,1m(1:1),,,,,,2Fig.2Themodelofimpingingjet22.1,hPd=22.3,3Fig.3Originalphotoandprocessedresult963:PIV34,,4(h=2d,=2.3)Fig.4Axialvelocityofimpingingjet,3,,55Fig.5Thebigscalevortexintheimpingementregion2.2:,,PIV6Fig.6Helicalmode7Fig.7Symmetricmode2d3d6d8d1.21.51.82.02.32.8,698Fig.8Processedresultofhelicalmode,,,,07(2004)18,,,7,,,9,,,9Fig.9Processedresultofsymmetricmode,,,,,,,,,,,h=3d=1.8h=2d=1.51.8,,h=2d3d1.51.6,,,h=2d,1.52.32.8,1.8(10),1.810hPd=2Fig.10Fluidconstructionatdifferentpressure(hPd=2)11()Fig.11Representativephotosofvortexstructure(liquidparticle)h=2d,1.5,,1.8,,1.8h=2d1.5,173:PIV,,,,,1.8,,1.8,,,,,,(11)3PIV,:(1),;(2),;(3):,,;(4),,;(5),:,;,;(6),:[1]KROTHAPALLIA.Flowfieldandnoisecharacteristicsofasu2personicimpingingjet[J].JournalofFluidMechanics,1999,392:155181.[2]ALKISLARMB.StereoscopicPIVmeasurementsofascreech2ingsupersonicjet[J].JournalofVisualization,2000,3(2):135143.[3]ALVIFS.Experimentalandcomputationalinvestigationofsu2personicimpingingjets[J].AIAAJournal,2002,40(4):599609.[4]HENDERSONB.Experimentsconcerningtonesproducedbyanaxisymmetricchokedjetimpingingonflatplates[J].Jour2nalofSoundandVibration1993,168(2):307326.[5],,.[J].,2003,43(11):14911494.[6]POWELLA.Onedgetonesandassociatedphenomena[J].Acustica1953,3:233243.[7]CHRISTOPHERKWTam.Supersonicjetnoise[J].FluidMech.,1995,27:1743.27(2004)18