With increasing demands for the economic efficiency of wind power generation,wind turbine blades are becoming longer and more flexible,and offshore wind farms are advancing into deeper seas.Hence,it is necessary to study the effects of platform motions on wind turbine blades and power generation under aeroelastic coupling conditions.Based on the elastic actuator line model,this study investigates the influences of pitch motion and surge motion on the aeroelasticity of floating wind turbine blades,analyzing aerodynamic power,aerodynamic thrust,and blade deformation.It is found that due to the additional velocity induced by forced motions,the fluctuation in aerodynamic power of a 15 MW turbine can reach three standard deviations,thereby reducing the average aerodynamic power of the turbine.Nonlinear distributions of blade bending and twisting deformations along the span are observed,with maximum blade tip flap deformation up to 14 meters,suggesting that sufficient deformation space should be allowed when designing tower structures and blade pre-twist angles.Moreover,asymmetric fluctuations in blade deformation are caused by differential velocities induced by platform pitch motion at various cross-sections,resulting in additional aerodynamic load fluctuations and structural responses on wind turbine blades.
elastic actuator line modelaeroelastic couplingforced motionfloating wind turbine
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