2004 modeling and simulation of dynamic inlet

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1、40thAIAA/ASME/SAE/ASEEJointPropulsionConferenceandExhibitAIAA2004-393311-14July2004,FortLauderdale,FloridaModelingandSimulationofDynamicInletFlowDistortionGenerationKeithP.Savage,*GaryA.Flandro,†andJosephMajdalani‡UniversityofTennesseeSpaceInstitute,Tullah

2、oma,TN37388Integratingajetengineintoanairframeinvolvesmanydesignandtestingsteps.Furthermore,thedevelopmentofhighperformancefighteraircrafthasaddednewrequirementstothisprocess.Groundtestfacilitiesareusedtosimulatetheeffectofinletshapeontheperformanceofaneng

3、ineforcruiseflightorotherfixedconditions.Whileastaticsimulationoftheinletshapeisadequateformostcircumstances,thetestingrequirementsofmilitaryfightercraftaregreaterbecauseoftheirhighmaneuverability,afeaturethatisaccompaniedbyintenseandbriefalterationsofthea

4、irflow.Thesetransientdistortionscanhaveasignificantimpactonperformanceaswellashavingthepotentialofcausingstructuralproblems.Inadditiontoairflowfluctuationcausedbyflightmaneuvers,thelaunchingofweaponsintotheairstreamcanintroducetransientturbulenceandexhaust

5、gascontaminants.Currently,noneofthesetransienteffectsarefullyexaminedinwindtunnelgroundtests.Onesolutionthathasbeenproposedtosimulatethisproblemingoundtestfacilitiesisanarrayofindividuallycontrolledwedgesplacedinawindtunnelaheadofthetestengine.Thewedgescou

6、ldbeopenedandclosed,notonlytosimulatethegiveninletshape,butalso,togeneratetransientdistortions.Coupledwithasystemtointroducecontaminantsintotheflow,allmanneroftransientandstaticinletflowdistortionscouldbesimulatedinacontrolledenvironment.Thispaperfocuseson

7、implementingnumericalandanalyticalmodelstocapturethefreestreamturbulenceandflowdistortiondownstreamofvariableanglewedges.Thenumericalschemeinvolvesapplicationoftheshearstresstransportapproach(usingthek-ωturbulencemodel).TheanalyticalapproachisbasedonPrandt

8、l’smixinglengthhypothesisandGörtler’stechniquefortreatingfarwakeflowbehindabluffbody.Thenumericalandanalyticalsolutionsarecomparedtotheexperimentalmeasurements.ItisshownthatwhileafullblownCFDsimulationcanaidt