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1、(c)2001AmericanInstituteofAeronautics&AstronauticsorPublishedwithPermissionofAuthor(s)and/orAuthor(s)'SponsoringOrganization.JlfAAA01-16638AIAA2001-0820Three-DimensionalNumericalSimulationoftheJetScreechPhenomenonHaoShenandC.K.W.TamFloridaStateUniversityTa
2、llahassee,FL39thAIAAAerospaceSciencesMeeting&Exhibit8-11January2001/Reno,NVForpermissiontocopyorrepublish,contacttheAmericanInstituteofAeronauticsandAstronautics1801AlexanderBellDrive,Suite500,Reston,VA20191(c)2001AmericanInstituteofAeronautics&Astronautic
3、sorPublishedwithPermissionofAuthor(s)and/orAuthor(s)'SponsoringOrganization.Three-DimensionalNumericalSimulationoftheJetScreechPhenomenon^HaoShen*andChristopherK.W.Tarn**FloridaStateUniversityTallahassee,FL32306-4510email:tamtoath.fsu.eduAbstracttivity,iti
4、sknownthatthestagingMachnumbersThree-dimensionalnumericalsimulationsofthedifferslightlyfromexperimenttoexperiment.Evenjetscreechphenomenonarecarriedoutusingtheinthesamefacility,theytendtodiffersomewhatmultiple-size-meshmultiple-time-stepDispersion-whenthee
5、xperimentisrepeatedatalatertime.Relation-Preservingscheme.Thesimulationsrepro-Jetscreechisknowntobedrivenbyafeedbackducealltheexperimentallyobservedcharacteristicloop3.Theenergyissuppliedbytheinstabilityfeaturesofthescreechtonesincludingtheaxisym-wavesofth
6、ejetflow8.ThephenomenonishighlymetricAandA2modes,theflapping/helicalBnonlinear.Asaresult,evenafterfortyyearsofinves-andCmodesandthestagingphenomenon.Screechtigation,onlyapproximatescreechtonefrequencytonefrequenciesaswellasintensitiescalculatedbypredictio
7、nformulasareavailable9"11.ThescreechthenumericalsimulationsareinexcellentagreementtonefrequenciesoftheAandA2modesdifferonlywithexperimentalmeasurements.Powerspectralslightly.ThesameistruewiththeBandCmodes.analysisofthenumericalsimulationdataprovidesir-The
8、availablepredictionformulas,unfortunately,arerefutableevidencethatwhenevertwotonesaremea-incapableofdistinguishingthetwomodes.Forasuredinthenoisespectrum,itisnotbecausethereisgivenMachnumber,theseformulaspred
