矩形管湍流冲击射流场的PIV实验研究

191Vol.19,No.1200503JournalofExperimentsinFluidMechanicsMar.,2005:167229897(2005)0120087207PIV1,2,1,3,3(1.,100084;2.,710049;3.,266510):(PIV),20000-4,,,,;,:;;:O354.7:AExperimentalstudyonrectangularturbulentimpingingjetflowfieldbyPIVtechniqueCHENQing2guang1,XUZhong2,WUYu2lin1,ZHANGYong2jian3,ZHANGYong2chao3(1.DepartmentofThermalEngineering,TsinghuaUniversity,Beijing100084,China;2.DepartmentofFluidEngineering,XianJiaotongUniversity,Xian710049,China;3.ShandongUniversityofScienceandTech2nology,Qingdao266510,China)Abstract:Turbulentimpingingjetsarewidelyusedinengineeringandmilitaryindustrialfield.TheflowfieldofarectangularturbulentimpingingjethasbeenmeasuredexperimentallybythePIVtechnique.Theex2perimenthasbeencarriedoutforReynoldsnumberof20000andfornozzle2to2platespacingoffourtimesofthehydraulicdiameterofthejetpipe.Distributionsofaveragevelocityandvorticityondifferentcutplaneslocatedinthemainjetregionandtheimpingementregionhavebeenobtained.Ithasshownfromtheexperimentalre2sultsthatthevorticitynearthejetboundaryregionishighinmagnitudeduetotheinteractionbetweenthejetfluidandtheentrainedambientfluid.Anobviousrecirculationzonehasalsobeenfoundintheoutflowregionofthefield,whichisoneofthecharacteristicsofthesemi2confinedimpingingjetflowfield.Keywords:three2dimensionalturbulentflow;impingingjet;PIV0,,,,,;V/STOL(),;,[1]:2004204215;:2004208205:(19692),,,,.:.,,,[2],,,,(ParticleImageVelocimetry,PIV),,,11,PIV,1Fig.1Experimentalsystemofimpingingjet1.1PIVPIV,,PIV(1)TSI,Nd2YAG,300mJ,10ns,532nm630046PIVCAM230,1018pixel1018pixel,30/CCD,1s,PIVWindowsNT4.0InsightNT,1000,:,,,88(2005)191.2PIVPIV,[3],,,Rosco1600,12m,,PIVPIV,[4]PIV,,,1.312,,,,,Re,,,,,0.04m3,,,,,,,,,,ab=40mm10mm,()d=2ab/(a+b)=16mm,40d,PIV,5mm1m1m,,H=4d2Fig.2Sketchoftestrig981:PIV1.4:,,,;,,n,Dixon[5]PIV,,011pixe[6]z=3.75d,630046PIVCAM230,1018pixel1008pixel,132.78mm131.47mm(,),13014364pixel64pixel,50%,4040,4mm,1/4,0.625%2PIV,,,Re,31/4xy(x,y)z,u,v,wx,y,zRe=wbd/v,,wb,v,,,,x,y=0,1d,3d,6dz=1d,2d,3d,3.75d12,Re=200003Fig.3Coordinatesystemandaquarteroftheflowregion2.1,,50,4,,,,,;,,,,5,x=0y=0:x=5w/5y-5v/5z,y=5w/5x-5u/5z5100,,45,,,,,Re,,,5%,Re09(2005)19(a)x=0(b)y=04Fig.4Averagevelocitydistributiononjetsymmetricplanes(a)x=0(b)y=05Fig.5Vorticitycontouronjetsymmetricplanes2.26xy,(),191:PIV6Fig.6Averagevelocitydistributiononverticalcutplanesoftheflowfield,,,6,,,,:,,,,,,2.37z,6,,,xy,4mm7(a)(b),,,,z=3d,7Fig.7Averagevelocitydistributiononhorizontalcutplanesoftheflowfield29(2005)19,,:xy,x,y,z=3dz=3.75d,,z=dz=2d,,,0,,,,3PIV,:,;,;,:[1]CRAFTTJ,etal.Impingingjetstudiesforturbulencemodelassessment22II.Anexaminationoftheperformanceoffourtur2bulencemodels[J].Int.J.HeatMassTransfer,1993,36(10):26852697.[2].[D].,2003.[3]MELLINGA.Tracerparticlesandseedingforparticleimagevelocimetry[J].Measurementscience&technology,1997,8(12):140621416.[4]ADRIANRJ.Particle2imagingtechniquesforexperimentalflu2idmechanics[J].AnnualReviewofFluidMechanics,1991,23:261304.[5]DIXONWJ,MASSEYFJ.Introductiontostatisticalanalysis[M].4thed.NewYork:McGraw2Hill,1983.[6]WESTERWEELJ.Fundamentalsofdigitalparticleimagingve2locimetry[J].Measurementscience&technology,1997,8(12):13791392.391:PIV