actran 2010全球用户大会-mtu-航空发动机声衬

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1、ACTRANTMcross-validationversusACTRANDGM:a2DnumericalstudyPaulTraubMTUAeroEnginesYourlogo1ContentsIntroductionMotivationofActran/TMversus/DGMcross-validation;focusonturbinenoiseradiationthroughengineexhaustStepsforActransimulationSpecificationofthenumericalmodelResults

2、Conclusions2IntroductionMTUAeroEnginesdevelopsandproducessub-systems(e.g.compressors,turbines)ofjetengines.MTUisworld’sleadingindependentMROprovider.Fromanengineeringprospective:Growingdemandoflownoiseaircraftsbringsouttechnicalchallengeswhichrequiresmoreandmoreaccurateae

3、ro-acousticcomputationmethods.Turbinenoiseradiationthroughengineexhaustisofparticularinterest:Thedesign-processdemandsanturbinenoiseevaluationforbothoperatingconditions,landing(Approach)andtake-off(e.g.Flyover-Cutback).3IntroductionMTUAeroEngines,MunichCompaniesheadquarter

4、sMTU’sactivitiesrelatedtosub-systems4IntroductionEnginenoisesourcesNumericalstudyfocusonturbinenoiseradiationproblem5MotivationofActrancross-validationSincetherelease2009,Actran/TMhasthe“Moehring”operatoravailable:Apropagationoperatorallowingtoperformacousticcomputationsin

5、bothnon-uniformflowandtemperaturefields.Asinglepaperdealswiththevalidationofthe“Moehring”method,butonlyforflowsoflow(<0.1)Mach-no..Inviewofpracticalapplication:Howusefulisthe“Moehring”approachtomodelthepropagationthroughstrongshearlayersofhighgradientsinMachno.andtemperat

6、ures.Actran/DGMisvalidatedwithintheMESSIAEN,TURNEXprojects;thusthecomparisonofActran/TMresultswithActran/DGMisself-evident6StepsforActransimulationApplyingMoehringoperator1.Modelspecification(databaseformeshingandaero-acousticcomputation)2.Flowcomputation(RANS)basedonCFD-m

7、esh3.Flowfield,interpolatedonAcoustic-meshbyusingActran/CFDinterface–VelocityfieldrepresentedbyFLOWdatablock–PressureanddensityfieldrepresentedbyACOUSTIC_HETEROGEINITYdatablock4.Actransetup(acousticmesh,interpol.flowfield,boundaryconditionsetc.)5.Actrancomputationandpost-pr

8、ocessing(nearandfarfieldsimulation)7ModelSpecificationOverview:Geometryanddimensi