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机翼三维绕流的非定常模拟研究.docx

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机翼三维绕流的非定常模拟研究 Abstract Thethree-dimensional(3D)unsteadyflowaroundawinghasbeenanactiveresearchareainthefieldofComputationalFluidDynamics(CFD)forseveraldecades.Theimportanceofthisresearchliesinthefactthatunderstandingofunsteadyflowphenomenaonwingsiscriticalforimprovingtheaerodynamicperformanceofaircraftandreducingtheiracousticemissions. Thispaperpresentsareviewofthecurrentstate-of-the-artinthenumericalsimulationsof3Dunsteadyflowaroundwings.First,abriefintroductiontotheimportanceofunsteadyflowonwingaerodynamicsisgiven.Then,thenumericalmethodsforsimulatingunsteadyflowaroundwingsarereviewed,includingthefinitevolumemethod,panelmethod,andspectralmethods.Next,theeffectofwinggeometryontheunsteadyflowisdiscussed,includingtheeffectsofwingcamber,sweep,andaspectratio. Finally,thepapersummarizestheimportantfindingsfromrecentstudiesonunsteadyflowaroundwings.Theseincludetheeffectsofturbulenceintensity,frequency,andangleofattackontheunsteadyflow,aswellastheformationandsheddingofvortices.Thepaperconcludesthatfurtherresearchisneededtofullyunderstandthecomplexandvariedaspectsofunsteadyflowaroundwings,aswellastodevelopaccurateandefficientnumericalmethodsforsimulatingsuchflows. Introduction Thestudyof3Dunsteadyflowaroundwingsiscrucialforimprovingtheaerodynamicperformanceandreducingtheacousticemissionsofaircraft.Aircraftwingsgenerateunsteadyflowduetovariousfactorssuchasgusts,turbulence,andmaneuvering.Unsteadyflowcancausedynamicliftanddragforcesthataffecttheaircraft'sstabilityandcontrol,aswellasincreasethelevelsofnoiseproducedbytheaircraft. Numerousstudieshavebeenconductedtobetterunderstandtheunsteadyflowaroundwingsusingbothexperimentalandnumericalmethods.Numericalmethods,suchasComputationalFluidDynamics(CFD),havebecomeincreasinglypopularduetotheirabilitytopredictcomplexunsteadyflowphenomenaandprovidedetailedflowfieldinformation. NumericalMethods NumericalmethodsareusedtosolvetheNavier-Stokesequationsthatgovernthemotionoffluidsaroundawing.Therearevariousnumericalmethodsavailableforsimulat