汽车空调出风管道气动噪声分析与控制

37320103()JournalofHunanUniversity(NaturalSciences)Vol.37,No.3Mar12010:167422974(2010)032002420531,1­,2,1,1,1(1.,410082;2.,430075):CFD(ComputationalFluidDynamics)SYSNOISE,LES(LargeEddySimulation),SYSNOISE.,.,,4.5dB.:;;;FWH;:U461.1:ANumericalAnalysisandControloftheAerodynamicNoiseofAutomotiveHVACDuctWANGYi2ping1,GUZheng2qi1­,YANGXue2,LIWei2ping1,LINXiao2hui1,LUKe2long1(1.StateKeyLaboratoryofAdvancedDesignandManufactureforVehicleBody,HunanUniv,Changsha,Hunan410082,China;2.WuhanOrdnanceNoncommissionedOfficersSchool,Wuhan,Hubei430075,China)Abstract:TheaerodynamicnoiseofautomotiveHVACductwaspredictedwithcomputationalfluiddy2namics(CFD)coupledwithspecializedacousticscodesSYSNOISE,i.e.,thetransientflowfieldintheau2tomotiveHVACductwascomputedonthebasisoflargeeddysimulation(LES)andthenoisesourcetermwasobtained.ThenthenoisesourcetermwasimportedintotheacousticsoftwarecalledSYSNOISEastheboundaryconditiontocomputethespreadofnoise.Accordingtotheanalysisresultofflowfieldandacous2ticfield,towimprovementschemeswereproposed,andair2conditioningsystemnoisewastestedontheba2sisofprototypeandimprovementmodel.Thetestresultshaveshownthatthetowschemesareeffectiveinreducingtheair2conditioningsystemcomparedwiththeprototypemodel.Inparticular,thenoiseissignifi2cantlyreducednearthedriver’sear,andthelargestdeclinesbyupto4.5dB.Keywords:aerodynamicnoise;computationalfluiddynamics(CFD);largeeddysimulation(LES);FW2Hmodel;directboundaryelementmethod(BEM).,3:2009-04-01:(863)(2007AA04Z122);(06FJ2001);(531105050037);(60870001):(1984-),,,­,E2mail:[e-mail]3:HVAC(Heating,VentilatingandAirCondition2ing).HVAC.HVAC,.,.1992ICASENASACAA(ComputationalAeroacous2tics)[1].CAACFD(Compu2tationalFluidDynamic),CFD.CFDCAA4,CFD[2-7].LES(LargeEddySimulation),,SYSNOISE,FFT(FastFourierTransform),FW-H..,.,,,4.5dB.1CFD111LESNavier2Stokes,LES[8]:55t(ui)+55xj(uiuj)=-5p5xi+55xj(5ui5xj)-5ij5xj,(1)55t+55xi(ui)=0.(2):;uiuj;;ij.,,ij-13kkij=-2tSij.(3):ij;t;Sij.112FW2H1969WilliamsLighthillFW2H[9]:1a20525t2-525x2ip’=525xi5xj{TijH(f)}-55xi[niP(f)f]+55t[vn(f)f].(4):p’;ni;vn;a0;TijLighthill.3.,,,,[5],,.113pHelmholtz:2p+k2p=0.(5)Helm2holtz,(X)(X)Helmholtz:p(Y)=kS(X)5G(X,Y)5n-(X)G(X,Y)dS.(6)(6),:BCTCD=fg.(7):B,CD;;;fg.,p0:p0=aTpb+bTub.(8):a,b;pb;ub.2CFDFluentSYSNOISE.1.52()20101Fig.1Theanalysisflowchart33113.1.12,.44.2Fig.2ModelofHVACduct3.1.23.,,,3,210.,:1);2).,RNG.,,.2s,,1s.,,3Fig.3Themodelofductmesh.,1000Hz,0.0005s.2000,20.3.1.34,,,,,,,.4Fig.4Statepressurealongthecross2sections5,.,,,,,.5Fig.5Streamlinesalongthecross2sections,4,1.1Tab.1Themassfluxcomparisonbetweenexperimentalvalueandcalculatedvalues/(kgs-1)10.03480.035520.05030.051230.03360.034740.03620.0352623:3123.2.1SYSNOISE,,16,1000Hz,56mm.CFD,6.4.6Fig.6DipolestrengthdistributiononacousticmeshSYSNOISE,CFD,CFD.,,,N,;,N.CFD(7),,6,(9),8.7LES()()Fig.7DetailofLESmesh(left)andacousticmesh(right)8Fig.8TheinterpolationsketchmapuA=u11d1+u21d2+u31d3+u41d4+u51d5+u61d61d1+1d2+1d3+1d4+1d5+1d6.(9)3.2.2.9..4,,.,,.(a)60Hz(b)170Hz(c)260Hz(d)330Hz9Fig.9Soundpressureleveldistributionsonfieldpoint10,370Hz.,.,,,./Hz10Fig.10Thesoundpressurelevel(SPL)arounddriversleftear4411,72()2010.,,1112..13,,,,.1112Fig.11SchemeoneFig.12Schemetwo13Fig.13Flowfieldintheinteriorofducts4121112,,,,43.2.2Tab.2Noisetestdata/dB(4)/dB(3)80.278.177.170.568.968.281.980.779.171.670.270.081.879.779.272.870.771.480.278.577.771.269.369.473.570.669.063.561.860.071.269.068.562.260.659.2413,.,,,.,.,,,.51),,.2),,,.3)4,,.4),.[1]HARDINJC,HUSSAINIMY.Computationalaeroacous2tics,ICASE/NASA.Series[M].NewYork:SpringerVer2lag,1993:149-168.[2]ANCF,SINGHK.Optimizationstudyforsunroofbuffetingreduction[R/OL]//[2006204203][3]SOVANISD,LOKHANDEB,XUJY.Computationalaeroacousticanalysisofagenericsideviewmirror[R/OL]//[2003205205][4]GUZheng2qi,WANGYi2ping,YANGXue,etal.Evaluationofaerodynamicnoisegeneratedinaminiaturecarusingnumer2icalsimulation[R/OL]//[2009204220][5]MOHAMUDOM,JOHNSONP.BroadbandnoisesourcemodelsasaeroacoustictoolsindesigninglowNVHHVACducts[R/OL]//[2006204203][6].[D].:,2007:10-16.XIAOBao2yi.Studyonaerodynamicnoiseofroadvehiclewithhighspeed[D].Changsha:CollegeofMechanicalandVehicleEngineering,HunanUniversity,2007:10-16.(InChinese)[7]AYARA,AMBSR,CAPELLMANNC,etal.Predictionofflow2inducednoiseinautomotiveHVACsystemsusingacom2binedCFD/CAapproach[R/OL]//[2005204211][8].[M].:,2004:139-141.WANGFu2jun.Computationalfluiddynamicanalysis[M].Beijing:TsinghuaUniversityPress,2004:139-141.(InChi2nese)[9]WILLIAMSJEF,HAWKINSDL.Soundgenerationbytur2bulenceandsurfacesinarbitrarymotion[J].PhilosophicalTransactionsoftheRoyalSocietyofLondon,1969,264(A1151):321-342.82