湍流边界层脉动压力对声强测量的影响研究.pdf

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1、第14卷第3期船舶力学V01．14No．32010年3月JoumalofShipMechanicsMar．2010ArticIeID：10070294(20lO)03_0314—10nfluenceFluctuaoftheTurbulentBoundaryLayerPressuretionontheSoundIntensityMeasurementinaMeanFlowsHlXiao_ju一，民nnjACOBSENl(1ChinaShipScientificResearchCenter，Wu]【i214082，China．2A

2、cou8Ⅱc1'echnology，1fechnicaIUniversjtyofDenmark，Denmark2800)Abst髓ct：0nmeasu—ngtIlesoundintens时inanowtlleinnuenceofturbulentboundarylayer(TBL)pres8urenuctuationisasubiectofpracticalconcem．Inthispaper，themodeIofthesoundintensitycausedbvtheTBLpre骼ureⅡuctuationisdesc曲ed

3、6rsdy．Basedupont}ledevelopednlodel，dlesoundintensitvcausedbvtheTBLpressurenuctuationi8calculatedusingtheavailablemodelsofthewave—vectorhequencyspect】moftlleTBLpressurenuctuation．InordertovaJidatet}lemodelandthenumericalresuhs．aseIiesofmeasurementswasc埘edout．Itisshow

4、nt}latthecaLlculatedresuhsoftIleTBLpressurenuctuationagreefairlywellwiththemeasuredresultswhicharecon．ectedwithtlleestimatedspatialre印onsefunction《themicrophone．Also，thecharacteristicsofthemeasuredsoundintensitvareconsistentwiththatoft王lecalculatedsoundintensity．Key

5、woIIds：s伽nd；soundinte吣埘；turbulentbo帅darylayer(TBL)；pre蹒urenuctIlationCLCn咖ber：TB52Doc啪entcOde：A1IntroductionSoundintensitvtechniqucshavebeenwidelyappliedintherelevantareasasaroutinemeans，particularlyin￡henoisecontrolen百nee—ng．However，thesoundin￡ensityinanowstilldese

6、rvesmorestudies．Moreover，thissubjectisofpracticalconcem，sincethesoundin—tensityprobeisgenerallyexposedtotheaimowdudngthemeasurementsthattakeplaceinsitu，suchasthemeasurementonamovingvehicle，themeasurementneauranajrc001edmachin-enrandthemeasurementinheating，ventilatio

7、norairconditioningductsorneartheintakes0routletsofsuchducts，andoutdoormeasurements，etc．Somedevelopmentshavebeenmadeonthesubjectofsoundintensitymeasurementintheflow．MunroandIngardlllhadprovedthatthesoundintensitymeasurementtechniquesu8·ingcrosscorrelationbetweentwocl

8、oselyspacedmicrophonescannotbeextendedtogeneralthreedimensionalsituationsinwhichthereisameannow．However，itmaybepossibletomeasuresoundinten