181围栏高度对施工扬尘迁移扩散影响的数值模拟研究邓济通黄远东张强

*12121．2000932．200032CFD。41.82.22.53.0m。3581215m/s。。。1.8m2.2m7.4%。。CFDDOI10.13205/j．hjgc．201404020ACFDSTUDYONEFFECTSOFFENCEHEIGHTONMIGＲATIONANDDIFFUSIONOFCONSTＲUCTIONDUSTDengJitong12HuangYuandong1ZhangQiang21．UniversityofShanghaiforScienceandTechnologyShanghai200093China2．ShanghaiＲesearchInstituteofBuildingScienceShanghai200032ChinaAbstractBasedonthemethodofCFDnumericalsimulationitwasstudiedtheeffectsofdifferentfenceheightsonmigrationanddiffusionofconstructiondust．Fourdifferentfenceheights1.8m2.2m2.5mand3.0mwereselectedand5windspeedlevels3m/s5m/s8m/s12m/sand15m/sthroughtheconstructionsitewereusedanditwasstudedthewindfieldinconstructionsitesandthelawofmigrationanddiffusionofconstructiondust．Theresultsshowthatintheleewardofearthworksbackflowhappensanditcancausedustpollution．Inthewindwardofearthworksupstreamcarriesdusttootherareasinsiteswhichcancausedustpollution．Theconstructiondustofconstructionsitesaround1.8mfencesismucheasiertodisperseintoexternalenvironmentcomparedtootherstheconstructiondustofconstructionsitesaround2.2mfencesishardertodisperseintoexternalenvironmentandthemaximumdifferenceis7.4%．Withtheincreaseofwindvelocitytheeffectofdifferentheights’fencespreventingdustintoexternalenvironmentbecomesless．KeywordsCFDconstructionfenceconstructiondustfenceheightexternalenvironment*“”2012BAJ03B03-02JWCXSL1202。2013－06－150。2012GB3095—2012《》PM2.5PM10。、、。。Cheng1MM5-AＲPS-CMAQ2002PM1010.7%2CALPUFF2002PM1012%3ISC3200311—1238AirPollutionControlPM1013.3%。。。4、5、6。。。1CFDComputationalFluidDynamics。、N-SＲNGκ－ε。1U—ixi=0i=1231U—x。U—it+U—jU—ixj=－1ρp—xi－xjuiu()j+ν2U—i2tρp－。2ＲNGk－εＲNGk－εYakhotOrzag7ＲNG“renormalizationgroup”。ＲNGk－ε。ＲNGk－εk－εkε8kt+ujkxj=1ρxjαkμeffkx[]j+Gkρ－ε3εt+ujεxj=1ρxjαεμeffεx[]j+1ρCε1Gkεk－Cε2+Cμρη31－η/η01+βη[]3ε2k4μeff=μ+μtμt=ρCμk2εCμ=0.0845αk=αε=1.39。C*1ε=C1ε－η1－η/η01+βη35C1ε=1.42C2ε=1.68η0=4.377β=0.012η=2Eij·Eij1/2kεEij=12uixj+ujxi。3。x0y0z0xyzx0y0z0t。2x、z、y20010015m。×=200m×100m20000m2。××=60m×20m×2m。1.82.22.53.0m。Tetra/Mixed。0.6m2m5m。。45。3201245.5～7.9m/s33.4～5.4m/s713.9～17.1m/s。3581215m/s5。。48EnvironmentalEngineering10μm。4。3581215m/s1。。。1。。。。581215m/s3m/s。241.82.22.53.0m。Ｒatio1、Ｒatio2、Ｒatio3、Ｒatio4、Ｒatio53581215m/s。。Ｒatio。5。Ｒatio=EscapeNumbersSum×100%6Sum=EscapeNumbers+TrapNumbersEscapeNumbersSum。21.8m8m/s1.8m3m0.6%2.2m8m/s2.2m2.5m0.4%。1.8m3.0m13581215m/sFig．1Vectordiagramof3581215m/swindflowthroughearthworkarea。41.8m58AirPollutionControl2Fig．2Escaperateofdustthroughdifferentfenceheight2.2m。Δratio43。3ΔratioFig．3ThechangeofΔratioindifferentwindvelocity3Δratio7.4%Δratio12m/s15m/s2.5%。3m/s7.4%。2.5%5%。。5CFD。。。1.82.22.53.0m1.8m2.2m。。。。1ChengSYChenDSLiDSetal．Theassessmentofemission-sourcecontributionstoairqualitybyusingacoupledMM5-AＲPS-CMAQmodelingsystemAcasestudyintheBeijingmetropolitanregion．ChinaJ．EnvironmentalModeling＆Software200722111601-1616.2．PM10J．．20093114-120.3．J．2009296567-573.4．J．200981618-1623.5．J．2008291259-262.6．J．200728122885-2888.7YakhotVOrzagSA．ＲenormalizationgroupanalysisofturbulencebasictheoryJ．ScientificComputer198613-11．8VersteegHKMalalasekeraW．AnintroductiontocomputationalfluiddynamicsthefinitevolumemethodM．NewYorkWiley1995150-169.1988－。[e-mail]1968－、。68EnvironmentalEngineering