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基于大涡模拟和声类比方法的平板冲击射流噪声指向性数值研究（英文）.docx

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基于大涡模拟和声类比方法的平板冲击射流噪声指向性数值研究（英文） Title:NumericalInvestigationofPlateImpingingJetNoiseDirectivityUsingLargeEddySimulationandAcousticAnalogousMethod Abstract: Jetnoiseisasignificantsourceofnoisepollutioninvariousengineeringapplications.Understandingandpredictingthenoisecharacteristicsofimpingingjetsiscrucialforthedesignandoptimizationofnoisecontrolmeasures.Thispaperpresentsanumericalstudyofthenoisedirectivitygeneratedbyaplateimpingingjetusingthestate-of-the-artLargeEddySimulation(LES)approachandtheAcousticAnalogousMethod. Introduction: Jetnoiseisacomplexphenomenonresultingfromtheinteractionofturbulentflowstructureswithsolidsurfaces.Impingingjets,wherethejetflowsdirectlyontoaflatplate,arecommonlyencounteredinindustriessuchasaerospace,powergeneration,andgasturbines.Thenoisegeneratedbyimpingingjetsisstronglyinfluencedbytheflowcharacteristicsandtheinteractionofturbulentstructureswiththeplatesurface.Therefore,adetailedunderstandingofthenoisedirectivityisessentialfordesigningeffectivenoisecontrolstrategies. Methodology: 1.LargeEddySimulation(LES): LESisapowerfulcomputationalfluiddynamicstechniquethatresolvesthelarge-scaleturbulentstructureswhilemodelingtheeffectsofsmallerscales.TheLESapproachisusedtosimulatetheimpingingjetontheplateandstudytheflowcharacteristicsintermsofvelocity,pressure,andvorticity. 2.AcousticAnalogousMethod: TheAcousticAnalogousMethodisemployedtocalculatetheradiatednoisefromtheimpingingjet.Thismethodapproximatesthefar-fieldnoiseusinganequivalentsourcedistributiononafictitioussurface.Thenoisedirectivityisanalyzedbycalculatingthesoundpressurelevelsatdifferentobserverlocations. ResultsandDiscussion: Thenumericalsimulationsprovideacomprehensiveunderstandingoftheflowandnoisecharacteristicsoftheplateimpingingjet.Theresultsshowthattheimpingingjetgeneratesastrongnoisesourceduetotheimpingementandboundarylayerinteractions.Thenoisedirectivityisfoundtobehighlydependentonthejet-to-platedistance,jetvelocity,andnozzlegeometry. Furthermore,thestudyinvestigatestheeffects