新型旋流分离器内固液两相流的数值模拟-吴春笃

22220062TransactionsoftheCSAEVol.22　No.2Feb.　2006吴春笃1,张　伟2※,黄勇强1,张　波1(1.,212013;　2.,212013)　:,,,。CFDFLUENT,K-ε,DPM,、、,,66%。,。:旋流分离器;污水处理;数值模拟:S276　　　　:A　　　　:1002-6819(2006)02-0098-05,　,,.[J].,2006,22(2):98-102.WuChundu,ZhangWei,HuangYongqiang,etal.Numericalsimulationofsolid-liquidflowinanewkindofcyclone[J].TransactionsoftheCSAE,2006,22(2):98-102.(inChinesewithEnglishabstract):2005-06-06　:2005-10-01:863“”::(1962-),,,,,、。　,212013。Email:[e-mail]※:　(1981-),,,、。　,2120130　　[1]、[2],[3,4],(1a),,(1b),,,,,SS。,,CFD[5,6]FLUENT[7,8][9]。,[10],,。1　。,,,、,,,。,,图1　旋流分离器Fig.1　Hydrocyclone,Stokes,[11]:v0=d2(ps-p)g18_×k2Vg(1)　v0——;ps,p——;_——;V——;k——。,,k,。。:uixi=0(2):　uit+ujuixj=-1dpxi+xj(vuixj-u′iu′j)+gi(3)　ui——;p——;t——,98s;d——,kg/s3;v——。,,,K-ε,。,,K-ε。:t(dk)+xi(dkuj)=xi(_+_tek)kxj+Gk+Gb-dX-YM+SK(4)t(dX)+xj(dXuj)=xj(_+_teX)Xxj+dC1SX-dC2X2k+vX-C1XXk-C3XGb+SX(5)C1=max0.43,ZZ+5(6)Z=SkX(7)Gk,:Gk=-du′iu′jujxi(8)Gb,:Gb=Ugi_tPrtTxi(9)Prt,gii。k-ε,Prt0.85。U,:U=-1ddTp(10)YM,,Mach。k-ε,YMk。Sarkar,:YM=2dXM2t(11)MtMach。k-ε1。1　k-εTable1　Constantsofthisk-εmodelC1XC2ekek1.441.91.01.2:C_=1A0+AskU*X(12):U*≡S～ijSij+Ψ～ijΨij(13)Ψ～ij=Ψij-2Xijkkk(14)Ψ～ij=Ψij-Xijkkk(15)Ψijkk,A0:A0=4.04,As=6cosh(16)h=13cos-1(6W)(17)W=SijSjkSkiS～(18)Sij=12uixj+ujxi(19)C_、、。3　3.1　CAD[4]。::DN=2100mm:Dinlet=400mm:H=2200mmd=1.0×103kg/m3,V=1m/s,P=0,Rosin-Rammler:Yd=exp[-(d/d)n](20)　Yd——d;d——,mm;n——。:d=2.8×103kg/m3,Tss=10g/L,d=0.013mm,dmax=0.030mm,dmin=0.003mm,n=4.52SIMPLEC。3.2　2。,。。,,,,。,。3,,。,,,,。,,,,,,。4。,。,,。99　2:图2　静压分布等值线图(帕)Fig.2　Contourofstaticpressure(Pa)distribution图3　动压分布等值线图(帕)Fig.3　Contourofdynamicpressure(Pa)distribution。,,,、,,,,。,,,。。。。、。图4　切向速度等值线图(m/s)Fig.4　Contouroftangentialvelocity(m/s)图5　轴向速度等值线图(m/s)Fig.5　Contourofaxialvelocity(m/s)5。,、,、,,,、,;、。,,。,1002006　。。6。,。,,。,,。,,,,,。图6　径向速度等值线图(m/s)Fig.6　Contourofradialvelocity(m/s)图7　次级流动示意图Fig.7　Vectorofsub-flow7,:,,,,,,;,,,,,,。,,,,,,,。8,9,8,。,66%,SS。图8　颗粒相分布及分离效率图Fig.8　Massfraction&separationefficiency9,,d5013um8um。。图9　出、入口离散相分布Fig.9　Distributionofmassfractionofinletandoutlet4　　CFDFluentK-εDPM(DisperserPhaseModel),:1),,。2),,,,。3)、。4),。5)。101　2:6),,66%,。[　　　][1]　ChineB,ConchaF.Flowpatternsinconicalandcylindri-calhydrocyclones[J].ChemicalEngineeringJournal,2000,80:267-273.[2]　,,.[M].:,1998.[3]　　,,.[J].:,2003,25(1):13-16.[4]　　,　,,[J].:,2004,30(4):67-69.[5]　,:CFD[M].:,2004,30(4):67-69.[6]　CullivanJC,WillaamsRA.Newunderstandingofahydrocycloneflowfieldandseparationmechanismfromcomputerfluiddynamics[J].MineralsEngineering,2004,17:650-660.[7]　,　.[M].:,1998.[8]　,　,.FLUENT[M].:,2004.[9]　.[M].:,2002.[10]　,..FLUNT[C],2001:48-62.[11],.CATIA[M]:-,2001.Numericalsimulationofsolid-liquidflowinanewkindofcycloneWuChundu1,ZhangWei2,HuangYongqiang1,ZhangBo1(1.SchoolofBioandenvironmental,JiangsuUniversity,Zhenjiang212013,China;2.SchoolofMechanicalEngineering,JiangsuUniversity,Zhenjiang212013,China)Abstract:Thetechnologyofswirlseparationisanewly-developedpollutioncontroltechnologyforremovingsolidpollutioninwater.Byimprovingthetraditionalhydrocyclone,anewkindofswirlseparator,whichissmall,con-venienttoinstallandcanbeusedinthemunicipalsewagedisposalhasbeendesigned.InthispapertheauthorsdiscussthetechnologybynumericalsimulationwiththeCFDsoftwareFLUENT,usingtherealizableK-εmodelandDPMmodel.Accordingtothesimulation,thedistributionofbothdynamicandstaticpressureandthecontouroftangential,axialandradialvelocitycanbeobtained.Alsoitcouldbeconcludedthatalthoughitisnotgoodatclassification,thiskindofnewswirlseparatorcanreachahighseparationefficiencyat66%.Basedonthesimulationresulttheauthorsgivethekeytothedesignofthiskindofnewswirlseparator.Keywords:hydrocyclone;sewagedisposal;numericalsimulation1022006