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风力机翼型非定常气动力分析(英文) Title:UnsteadyAerodynamicAnalysisofWindTurbineAirfoils Introduction Withtheincreasingdemandforrenewableenergysources,windturbinetechnologyhasgainedsignificantimportanceinrecentyears.Theperformanceandefficiencyofwindturbinesheavilyrelyontheaerodynamiccharacteristicsoftheirairfoilprofiles.Understandingtheunsteadyaerodynamicforcesactingonwindturbineairfoilsiscrucialforoptimizingtheirdesignandenhancingtheiroverallperformance.Thispaperaimstoinvestigatetheunsteadyaerodynamicforcesonwindturbineairfoilsandtheirimpactontheperformanceofthewindturbine. UnsteadyAerodynamics Unsteadyaerodynamicsdealswiththetime-varyingflowphenomenathatariseduetothemotionoftheairfoils.Windturbinesoperateunderhighlyunsteadyflowconditions,withtherotorbladesexperiencingperiodicvariationsintheangleofattackduetotheirrotationalmotion.Thisresultsinvaryingliftanddragforcesontheairfoil,whichaffecttheoverallperformanceandstabilityofthewindturbine. AirfoilSelection Thechoiceofairfoilprofileplaysacrucialroleindeterminingtheperformanceofawindturbine.Airfoilswithhighlift-to-dragratiosaredesirabletomaximizethepoweroutputoftheturbine.Variousairfoilshapes,includingsymmetric,cambered,andasymmetricprofiles,havebeendevelopedandtestedforwindturbineapplications.Theselectionoftheappropriateairfoilprofiledependsonfactorssuchasthedesiredoperatingconditions,powerrequirements,andbladegeometry. UnsteadyAerodynamicForcesAnalysis Theunsteadyaerodynamicforcesonwindturbineairfoilscanbeanalyzedusingcomputationalfluiddynamics(CFD)simulationsorwindtunnelexperiments.CFDprovidesacost-effectiveandefficientmethodforstudyingthecomplexflowphenomenaandunsteadyforcesactingonairfoils.Time-domainsimulationscancapturetheunsteadyeffectsoftherotorblades'motionandpredicttheinstantaneousforcesontheairfoil. FactorsAffectingUnsteadyAerodynamics Severalfactorsinfluencetheunsteadyaerodynamicforcesonwindturbineairfoils.Theseincludetheangleofattack,Reynoldsnumber,rotationalspeed,bladegeometry,andflowturbulence.Theangleofattackdetermi