Effect of turbulence intensity on airfoil flownumerical simulations and experimental measurements.pdf

App1．Math．Mech．一Eng1．Ed．，a2(8)，1029～1038(2011) AppliedM athem atics DOI10．1007／s10483—011—1478—8 and M echanics ⑥ShanghaiUniversityandSpringer。Verlag Berlin Heidelberg2011 (EnglishEdition) Effectofturbulenceintensity on airfoilflow ：numericalsimulations and experim entalm easurem ents Shao—wuLI(李韶武)，ShuWANG (王 庶)， Jian—pingWANG (王健平) Jian—chunMI(米建春) (DepartmentofMechanicsandAerospaceEngineering，StateKeyLaboratoryoi1Turbulence andComplexSystems，CollegeofEngineering，PekingUniversity， Beijing100871，P．R．China) (CommunicatedbyWen—ruiHU) Abstract Theeffectoftheturbulenceintensityoftheoncomingstream on theaero- dynamiccharacteristicsoftheNACA一0012airofilisinvestigatedby adirectnumerica1 simulation．Thenumericalresultsarefoundtobeconsistentwiththeexperimentalmea~ surements．BasedonthefinitespectralQUICK scheme，thesimulationgetsthehigh accuracy results．Both thesimulation and theexperimentrevealthattheairfoilstall doesnotexistforthelow turbulenceintensity，however，Occurswhentheturbulencein— tensityincreasessufficiently．Besides，theturbulenceintensityhasasignificanteffecton both theairfoilboundarylayerandtheseparatedshearlayer． Key words finitespectralmethod，turbulenceintensity,boundarylayer，shearlayer liftforce，dragforce，airfoilstall Chinese Library Classi8cation O35 2010MathematicsSubjectClassification 76D10 1 Introduction Recentdevelopmentsinsmallwindturbines，smallunmannedaerialvehiclesfUAvs)micro— airvehiclesfMAVs)，andbird／insectflyingaerodynamicshaveattractedincreasingintereston t