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1、CALCULATIONOFAERODYNAMICFORCEONHORIZONTALAXISWINDTURBINEROTOREXERTEDBYTOWEREFFECT*1*2*3*4YutakaHASEGAWA,JunsukeMURATA,HiroshiIMAMURA,ShinyaHOTTA*5andKojiKIKUYAMA*1EcotopiaScienceInstitute,NagoyaUniversityFuro-cho,Chikusa-ku,Nagoya464-8603,Japan,phone:+81-52-789-2711,fax:+81-52-789-5123*1e-mail:has
2、egawa@mech.nagoya-u.ac.jp*2,4DepartmentofMechanicalScience,NagoyaUniversityFuro-cho,Chikusa-ku,Nagoya464-8603,Japan,phone:+81-52-789-2712,fax:+81-52-789-5123*2e-mail:h054101d@mbox.nagoya-u.ac.jp*4e-mail:h044123m@mbox.nagoya-u.ac.jp*3CollegeMasterHandsInc.*3e-mail:ima@cmhans.com*5NagoyaSangyoUniver
3、sityABSTRACT:Theexistenceoftowerinhorizontalaxiswindturbinesystemhasalargeeffectonsurroundingfluidflow.Incaseofupwindwindturbines,theunsteadyaerodynamicloadsoccurwhenthebladesofawindturbinearepassinginfrontofthetower.Thefluctuationofloadcausesavariationofpoweroutputanddeterminesafatiguelifeofthewi
4、ndturbine,directlyconcerningthecostproblems.Thepresentpaperdescribesanumericalmethodforcalculationofaerodynamicloadsontherotorblades,aninviscidaerodynamicmodelbasedontheasymptoticaccelerationpotentialmethodisadopted,whichiscapableofcalculatingtheunsteadyaerodynamicloads.Inthemodel,therotorbladesar
5、erepresentedbyspanwiseandchordwisepressuredistributions.Thetowerisrepresentedbypressuredistribution,inordertoadaptthenumericalmodeltothatforcalculationofaerodynamicloadsontheblades.Keywords:Windturbine,Towereffect,Numericalmethods,Accelerationpotentialmethod,Load,Windshear1.INTRODUCTIONtheassumpti
6、onofincompressible,inviscidandirrotationalTheexistenceoftowerinhorizontalaxiswindturbineflowaroundthewindturbine,itcanbederivedthatthesystemhasalargeeffectonsurroundingfluidflow.IncaseofpressureperturbationsatisfiestheLaplaceequationandactsasupwindwindturbines,theunsteadyaerodynamicloadsoccuranacc
7、elerationpotentialfunction.Inthemodeltherotorwhenthebladesofawindturbinearepassinginfrontofthebladesarerepresentedbyspanwiseandchordwisepressuretower.Thefluctuationofloadcausesavariationofpowerdistributions,which
