大喷嘴间距对置撞击流径向速度分布

JournalofEastChinaUniversityofScienceandTechnologyVol.26No.22000-04+(29576233):1998-10-22:(1971),,,,,:1006-3080(2000)02-0168-04+刘海峰*,　刘　辉,　龚　欣,　王辅臣,　于遵宏(华东理工大学资源与环境工程学院,上海200237):采用DANTEC公司的三维激光动态粒子分析仪(DualPDA)测定了大喷嘴间距同轴对置两流股及四流股撞击后的径向速度分布。实验结果表明不同喷嘴直径及射流速度时大喷嘴间距两流股及四流股撞击后的最大径向速度与射流初速度、喷嘴直径和喷嘴间距有关,最大径向速度对应的径向距离与喷嘴直径无关,径向速度分布具有相似性。:撞击流;径向速度;射流;喷嘴间距;喷嘴直径:TQ021.1:AElperin,Tamir[12]Champion[3]Kostiuk[4],,,,,,,DANTEC(DualPDA),(L2d11.9)(),(L2d11.9)(),11m,4m,14;,16.022.642.0mm(15m)1Fig.1Schematicofapparatus2DualPDALDA(LaserDopplerAnemometer),(514.5488476.5nm),(),,,DualPDA,500910461051682DualPDAFig.2SchematicoftheDualPDAsystem1-Argonionlaser;2-Braggcell;3-Photomultiplier;4-Signalprocessor;5-Computer;6-Communicator;7-Coordinateframe;8-1DTransmitter;9-2DTransmitter22.1,(d3)(),(II),[5]uu0=6.2dzexp-139.0rz2(2)TollmienPrandtl[6],=0.0256b1/2u=ku0d(3),,,,II,II,z=0.25L,:UrUrR+UzUrZ=-PR+0.161kR1RR(RUr)+2UrZ2(4)UrUzR+UzUzZ=-PZ+0.161kR1RR(RUz)+2UzZ2(5):Ur=ur6.2u0d0.25LUz=uz6.2u0d0.25LR=r0.25LZ=z0.25LP=p-ps!6.2u0d0.25L2:Z=1:P0Ur0Uz=exp(-139R2)UzZ=[exp(-139.0R2)-278R2exp(-139.0R2)](6),,(4)(6)u0dLL,urcu0dL=frL,urc,mu0dL=,rmL=3,,rrm,urcr;rrm,urcr,rm/L=0.20(7)4,urc,mu0dL=2.50(8)0.9785urcurc,m=11.85rL-21.56rL2e-9.251rL2(9)9.4%,urc,mu0d/L=,1692:3Fig.3urc/urc,mvs.r/Loftwo-jetimpinging4Fig.4urc,m/u0vs.d/Loftwo-jetimpingingrm/L=,urc/urc,mr/L,[12],,urc,m/u0=,rm/d=,urc/urc,mr/d,,u0d/L,r/L,d2.25,urc,rrm,urcr;rrm,urcr,,rm/L=0.20(10)6,urc,mu0=3.311dL0.8306(11)5.5%2.4urcurc,m=14.05rL+0.03666rL2e-5.045rL(12)11.2%5Fig.5urc/urc,mvs.r/Loffour-jetimpinging6Fig.6urc,m/u0vs.d/Loffour-jetimpinging,,rmL=0.20,urcurc,mrL,urc,mu0dL∀,∀=1.0,∀=0.8306(7),r,;r,,,r7Fig.7Comparisonofurc/urc,mbetweentwo-jetandfour-jet3(1),urc,17026,(8)(9);urc,md/L;rm,(2)urc,,(11)(12);urc,m(d/L)0.83;rm,(3)2.4,rmr,;r,:b1/2d,mkL,mps,Parrm,mu0,m/surc,m/surc,m,m/sz,m2/s:[1]TamirA.:[M]..:,1996.[2]TamirA,KitronA.Applicationofimpingingstreamsinchemicalengineeringprocess-review[J].ChemEngCom-mun,1987,50:241330.[3]ChampionM,LibbyPA.Reynoldsstressdescriptionofop-posedandimpingingturbulentjets.Closelyspacedopposedjets[J].PhysicsofFluids,1993,5:203216.[4]KostiukLW,BrayKNC,ChengRK.ExperimentalstudyofpremixedturbulentcombustioninopposedstreamsPart.Nonreactingflowfield[J].CombustionandFlame,1993,92:377395.[5],.[M].:,1988.[6]SchlichtingH.:[M]..:,1991.RadialVelocityofWideSpacedImpingingStreamsLIUHai-feng*,LIUHui,GONGXin,WANGFu-chen,YUZun-hong(CollegeofResourcesandEnvironmentalEngineeringECUST,Shanghai200237,China)Abstract:Theradialvelocitiesofwidespacedtwo-jetandfour-jetimpingingstreamshavebeenmea-suredbyDualPDAwithdifferentnozzlediametersandprimaryvelocities.Resultsshowthatthedistribu-tionofradialvelocityofwidespacedtwo-jetandfour-jetimpingingstreamshasrelationtod/L,themaxi-mumradialvelocityhasrelationtou0d/L,andtheradialdistanceofthepositionofthemaximumradialvelocityisdirectlyproportionaltoL.Keywords:impingingstream;radialvelocity;jetflow;distancebetweennozzles;nozzlediameter1712: