Spar式风机基础在风浪联合作用下运动响应研究

Spar式风机基础在风浪联合作用下运动响应研究AbstractSpar-typewindturbineshavebeenrapidlydevelopedandwidelyusedinoffshorewindpowerplantsduetotheirhighstabilityandefficiencyinharshmarineenvironments.Theperformanceofawindturbineheavilydependsonitsdynamicresponsetotheaerodynamicandhydrodynamicloadsdevelopedbywindandwaves.Inthispaper,weinvestigatethemotionresponsesofSpar-typewindturbinesundercombinedwind-waveloads.Byconductingnumericalsimulations,weexaminethedynamicbehaviorofSpar-typewindturbinesinvariousseastates.Theresultsofthisstudyprovideavaluablereferenceforoptimizingthedesignandoperationofoffshorewindpowerplants.Keywords:Spar-typewindturbine,dynamicresponse,combinedwind-waveloads,numericalsimulation,offshorewindpowerplant.IntroductionInrecentyears,offshorewindpowerhasbeenreceivingmoreattentionasacleanandsustainablealternativeenergysolution.Offshorewindpowerplantsrequirewindturbinesthatcansurvivetheharshenvironmentalconditions,suchasstrongwindsandwaves.Spar-typewindturbineshavebeendevelopedtomeettheserequirementsandhavebeendeployedinvariousoffshorewindpowerplantsworldwide.Spar-typewindturbinestypicallyconsistofacylindricalhull,arotor-nacelleassembly,andmooringlines.Thecylindricalhullisdesignedtoprovidehighstabilityandminimizethemotionresponseoftheturbineundertheactionofwindandwaves.Therotor-nacelleassemblyismountedontopofthehullandconsistsoftherotorbladesandthegenerator.Themooringlinesconnectthehulltotheseabedandprovidethenecessarystability.Thedynamicresponseofawindturbineisanimportantfactoraffectingitsperformanceandreliability.Theaerodynamicandhydrodynamicloadsdevelopedbywindandwavescancauseexcessivemotionresponsesoftheturbine,whichmayresultinincreasedfatiguedamage,reducedpoweroutput,andevenfailureoftheturbine.Therefore,itisessentialtoinvestigatethedynamicresponseofSpar-typewindturbinesundercombinedwind-waveloadstooptimizetheirdesignandoperation.LiteraturereviewNumerousstudieshavebeenconductedonthedynamicresponseofoffshorewindturbinesunderwindandwaves.Kokarakisetal.(2014)usedafullycoupledtime-domainsimulationtoinvestigatethemotionresponseofaSpar-typewindturbine.Thestudyfoundthatthehulldiameterhasasignificanteffectonthemotionresponseoftheturbine.YangandMoan(2010)analyzedthedynamicbehaviorofaSpar-typewindturbineunderdifferentwavespectra.Thestudyfoundthatthewavedirectionhasaconsiderableimpactonthemotionresponseoftheturbine.Wangetal.(2016)conductedanumericalstudyonthedynamicresponseofafloatingwindturbineunderwindandwaves.Theresultsshowedthattheplatformmotionandbladedeformationincreaseasthewaveheightandwindspeedincrease.ResearchmethodologyInthisstudy,weuseanumericalsimulationmethodtoinvestigatethemotionresponseofSpar-typewindturbinesundercombinedwind-waveloads.Thenumericalmodelincludestheaerodynamicmodel,thehydrodynamicmodel,andthemechanicalmodel.Theaerodynamicmodelisbasedonthebladeelementmomentumtheory,andthehydrodynamicmodelisbasedonthepotentialflowtheory.Themechanicalmodelisusedtorepresentthestructuralbehavioroftheturbine,includingthehull,therotor-nacelleassembly,andthemooringlines.ThesimulationisconductedusingtheFAST(Fatigue,Aerodynamics,Structures,andTurbulence)softwaredevelopedbytheNationalRenewableEnergyLaboratory(NREL).Thesoftwareisapubliclyavailabletoolformodelingandanalyzingwindturbinesandwindpowerplants.Inthisstudy,weuseFASTversion8forsimulatingthedynamicbehaviorofSpar-typewindturbines.ResultsanddiscussionThesimulationresultsshowthatthemotionresponseofSpar-typewindturbinesisstronglyinfluencedbythewindandwaveconditions.Ingeneral,theturbinemotionresponseishigherunderlargerwaveheightsandhigherwindspeeds.Thesurgemotionresponseisthemostsignificant,followedbytheheaveandpitchmotions.Theyawmotionresponseisrelativelysmaller.TheresultsalsoshowthattheSpar-typewindturbinehasapositivedampingeffectonitsmotionresponse.Thehulldiameterandlengthhaveasignificantimpactonthemotionresponseoftheturbine.Alargerhulldiameterandlengthresultingreaterstabilityandreducedmotionresponse.ConclusionInthisstudy,weinvestigatedthedynamicresponseofSpar-typewindturbinesundercombinedwind-waveloadsusingnumericalsimulation.Theresultsshowthattheturbinemotionresponseisinfluencedbythewindandwaveconditions,andthehulldiameterandlengthhaveasignificanteffectontheturbine'sstabilityandmotionresponse.ThefindingsofthisstudyprovidevaluableinformationfortheoptimizationofSpar-typewindturbinedesignandoperationinoffshorewindpowerplants.FurtherresearchisneededtoinvestigatethemotionresponseofSpar-typewindturbinesunderextremewindandwaveconditions.Keywords:Spar-typewindturbine,dynamicresponse,combinedwind-waveloads,numericalsimulation,offshorewindpowerplant.ReferencesKokarakis,G.N.,etal.(2014).Full-scaledynamicresponseofaspar-typefloatingwindturbine.JournalofoffshoremechanicsandArcticengineer