三维冲击射流截面宽厚比对动水冲击压力的影响

200510SHUILIXUEBAO3610:2005207226:(1964-),,,,E2mail:[e-mail]:055929350(2005)10212302061(,100044):,RNGk2,,,,,,,:;;;RNGk2:TV653:A,,,,,,[1],,,,,,J.J.McguirkW.Rodik2,,,,RNGk21,Sforza,Steiger,Trentacoste[23],Yevdjevitch[4],Rajaratnam[5],,McguirkRodi[6]k21,yoz,x,bh,yzu0um0,u0Pum0xPh1,x:0321(1)OA(potentialcoreregon):,,um0,u0(2)AB(characteristicdecayregion):,um0x-n,,,,n015110,(),n015,um0x--;,n110,um0x-1,um=um0f(yPby1P2),by1P2,um=um0P2y;1(3)BC(axisymmetrictypedecayregion):,um0x-1,um0,,,,um=um0f(zPbz1P2),Pbz1P2um=um0P2z,,(),TrentacosteSforza(slenderjet)(bluffjet),,2211,,,RNGk2,29ui9xi=0(1)9ui9t+9uiuj9xj=-9p9xi+9ij9xj(2)kDkDt=99xikeff9k9xi+Gk-(3)DDt=99xieff99xi+C1kGk-C22k-R(4):;ui;pGk,Boussinesq;C1C2,C1=1142,C2=1168;RR=C3(1-P0)1+32k(5)1321,SkP,0=4138,=01012R,C32=C2+C3(1-P0)1+3,:DDt=99xieff99xi+C1kGk-C322k(6)RNGk2,C32k2,,,,212SIMPLE213bPh=110116410161025105,,0101m2510mPs015m,1015(2),1P4,150000180000214,z=0y=0,,LaunderSpalding,,k,[7]33(bPh=410),,(xoy),,(xoz),[34],,34(xoz)(xoy),,,,4d4f,(bPh=1610bPh=2510),,(xoz)u(z),,[23],5,,,23214(6),,,,4,,332156,99tŠUiŠUi2+99xjŠUjŠUiŠUi2=199xj(…TijŠUi)-…Tij…Sij(7):…Sij=129ŠUi9xj+9ŠUj9xi,…Tij=-…Pij+2…Sij-uiuj,ijKronecker(7),…Tij3(),,,,,-2v…Sij…Sijuiuj…Sij(8),,,,,v,l…Sijvl,uiujv2(9)-2v…Sij…Sij-2vv2l2v3l=C1v3l,uiuj…Sijv2vlv3l=C2v3l(10)-…Tij…Sij=C1v3l+C2v3l=Cv3l(11),L-…Tij…Sijdl=LCv3ldl=Cv3lL(12)L,bPh(A),:L=bPh+1bPhA(13),LbPh,,,43215RNGk2,,,,,:[1],,.[J].,2003,(3):25-28.[2]SforzaPM,SteigerMH,TrentacosteN.Studiesonthree2dimensionaljets[J].AIAAJ.,1966(4):800-806.[3]TrentacosteN,SforzaPM.Furtherexperimentalresultsforthree2dimensionaljets[J].AIAAJ.,1967,5:885-889.[4]YevdjevitchVJ.Diffusionofslotjetswithfiniteorificelength2widthradios[R].Hydraulicspaper,ColoradoStateUniversity,FortCollins,March,1966.[5]RajaratnamN.Turbulentjets.Amsterdam[M].ElsevierSc.Publ.Co.,1976.[6]McguirkJJ,RodiW.TheCalculationofThree2DimensionalTurbulentFreeJets[M].TurbulentshearflowI.Springe2Verlag,1977:71-83.[7]KimSE,ChoudhuryD.ANear2WallTreatmentUsingWallFunctionsSensitizedtoPressureGradient[M].InASMEFEDVol.217,SeparatedandComplexFlows.ASME,1995.InfluenceofrectangularimpingejetsaspectratioonimpactpressureLIFu2tian(ChinaInstituteofWaterResourcesandHydropowerRsearch,Beijing100044,China)Abstract:TheRNGk2double2equationturbulencemodelisappliedtosimulatethe32Dsubmergedjetflowtoinvestigatetheinfluenceofaspectratioofflipbucketjetonimpactpressureactingonthefloorofplungepool.Thecalculationresultsofvariousaspectratioshowthattheflowvelocitydistributionsinfreejetregionareingoodagreementwiththeexperimentaldatagivenbypredecessors.Itimpliesthattheturbulencemodeladoptedisreasonable.Thefurtherinvestigationindicatesthatfollowingtheincreaseofsapectratiotheaxialvelocityofjetflowattenuatesrapidly,iftheinitialmomentumofthejetmaintainsconstant,andresultsinthereductionofimpactpressureactingofthewall.Keywords:rectangularimpingejet;aspectratio;impactpressure;RNGk2turbulencemodel(:)5321