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1、NUMERICALSIMULATIONOFAERODYNAMICNOISEGENERATEDBYHIGHSPEEDTRAINSZhenxuSun**,JingjingSong#andYiranAn**StateKeyLaboratoryforTurbulenceandComplexSystems,CollegeofEngineering,PekingUniversity,Beijing100871,ChinaE-Mail:anyr@pku.edu.cn(CorrespondingAuthor)**StateKeyLaboratoryofHighTemperatur
2、eGasDynamics,InstituteofMechanics,AcademiaSinica,Beijing100190,China#ChinaAcademyofAerospaceAerodynamics,Beijing100074,ChinaABSTRACT:Aerodynamicnoisebecomesmoreandmoresignificantandsometimescouldbepredominantastherunningspeedofhighspeedtrainsincreases.Asaresult,aerodynamicnoisehastobe
3、takenintoconsiderationduringthedesignofhighspeedtrains.Inpresentwork,theresearchonaerodynamicnoiseofthehighspeedtrainwithaspeedof300km/hhasbeenperformed.Thenonlinearacousticssolver(NLAS)approachisadoptedtostudytheaerodynamicnoiseinthenearfieldofthehighspeedtrain.Withtheuseofanacoustic
4、surface,theresearchontheaerodynamicnoiseinthefarfieldhasbeencarriedoutbysolvingtheFfowcs-Williams/Hawking(FW-H)equation.Atfirstthemethodvalidationisperformedthroughatwo-dimensionalbackwardstepcase,whichshowsexcellentagreementwithexperimentalresults.Thecharacteristicsoftheflowfielddomi
5、natethegenerationofaerodynamicnoise,thereforetheflowfieldisfirstlyanalyzed,includingthehead,therear,andtheinter-coachspacingofthetrain.Byuseofprobesinspecificregionsonthesurfaceofthetrain,thecontributionofdifferentpartsofthetraintotheaerodynamicnoiseisdiscussed.Meanwhile,thefarfieldfe
6、atureofaerodynamicnoiseisalsostudiedbyplacingprobesinthefarfield.Basedontheaboveanalysis,theaerodynamicnoiseperformanceofthespecifichighspeedtrainisassessed.Keywords:highspeedtrains,aerodynamicnoise,NLAS,FW-Hequation,acousticsurfaceHighspeedtrainnoiseemission:Latestinvestigationofthea
7、erodynamic/rollingnoisecontributionC.Melleta,_,F.Le′tourneauxa,F.Poissonb,C.TalottebaSNCFAgenced’EssaiFerroviaire,21AvduPtAllende,F94407VitrysurSeine,FrancebSNCFDirectiondel’InnovationetdelaRecherche,45ruedeLondres,F75379Paris,Cedex08,FranceAccepted26August2005Availableonline8February
8、2006A
