摘要
Airfoilself-noiseisacommonphenomenonformanyengineeringapplications.Aimingtostudytheunderlyingmechanismofairfoilself-noiseatlowMachnumberandmoderateReynoldsnumberflow,anumericalinvestigationispresentedonnoisegenerationbyflowpastNACA0018airfoil.Basedonahigh-orderaccuratenumericalmethod,boththenear-fieldhydrodynamicsandthefar-fieldacousticsarecomputedsimultaneouslybyperformingdirectnumericalsimulation.Themeanflowpropertiesagreewellwiththeexperimentalmeasurements.Thecharacteristicsofaerodynamicnoiseareinvestigatedatvariousanglesofattack.Theobtainedresultsshowthatincliningtheairfoilcouldenlargeturbulentintensityandproducelargerscaleofvortices.Thesoundradiationismainlytowardstheupperandlowerdirectionsoftheairfoilsurface.Athigherangleofattack,thetonalnoisetendstodisappearandthenoisespectrumdisplaysbroad-bandfeatures.
出版日期
2012年05月15日(中国期刊网平台首次上网日期,不代表论文的发表时间)