垂直轴风力机翼型设计综述

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1、Wind31-6_proof103/03/0810:08amPage401WINDENGINEERINGVOLUME31,NO.6,2007PP401–424401DesignofaSpecial-purposeAirfoilforSmaller-CapacityStraight-BladedVAWTMazharulIslam,DavidS-K.TingandAmirFartajDepartmentofMechanical,AutomotiveandMaterialsEngineering,UniversityofWindsor,Win

2、dsor,Ontario,CanadaN9B3P4.E-mail:islam1f@uwindsor.caABSTRACTSelectionofairfoilisoneofthemostcriticalfactorsinachievingbetteraerodynamicperformanceandindeterminingtheoptimumdimensionsofafixed-pitchstraight-bladedDarrieustypeverticalaxiswindturbine(SB-VAWT),alongwithsolidi

3、ty,radialarmparasiticdrag,aspectratioetc.AirfoilrelateddesignchangesalsohavethepotentialforincreasingthecosteffectivenessofSB-VAWTswhichisoneofthesimplesttypesofwindturbineandtheyareprospectivecandidatefordiversifiedurbanandruralapplications.Afteridentifyingthemainaerody

4、namicchallengesofthistypeofwindturbine,theauthorsshortlistedthesalientaerodynamicandgeometriccharacteristicsofadesirableairfoilforaself-startingandbetterperformingSB-VAWT.Basedonthesefindings,detailedperformanceanalysesweredonewithseveralprospectiveairfoils.Finallyaspeci

5、al-purposeairfoilhasbeendesignedforsmallercapacitySB-VAWT.Keywords:RenewableEnergy,VerticalAxisWindTurbine,VAWT,Straight-bladed,DarrieusNOMENCLATUREAprojectedfrontalareaofturbineµaspectratio=H/CCbladechordCdbladedragcoefficientCdozero-lift-dragcoefficientCd,stdragcoeffic

6、ientofsupportingstrutsofSB-VAWTsClliftcoefficientCPturbineoverallpowercoefficient=Pgross/ρAV∞3CP,netnetturbineoverallpowercoefficient=Pnet/ρAV∞3CQturbineoveralltorquecoefficient=Qgross/ρAV∞2RCQ,netturbineoveralltorquecoefficient=Qnet/ρAV∞2RCttangentialforcecoefficien

7、tDbladedragforceHheightofturbineHAWTHorizontalAxisWindTurbineLbladeliftforceNnumberofbladeRturbineradiusRLEleadingedgeradiusWind31-6_proof103/03/0810:08amPage402402DESIGNOFASPECIAL-PURPOSEAIRFOILFORSMALLER-CAPACITYSTRAIGHT-BLADEDVAWTRNlocalReynoldsnumber=WC/υSB-VAWTStrai

8、ght-bladedVerticalAxisWindTurbinetmaxmaximumthicknessofairfoiltTEtrailingedgethicknessV∞freestreamwindv