Evaluation of the Effect of Airflow Variations on the Flutter Boundary of Flexible Blades
In complex environments,wind turbine blades nearing critical flutter thresholds may experience flutter,potentially caus-ing damage.This study focuses on the NREL 5 MW offshore wind turbine's flexible blades,utilizing a combination of the Beddoes-Leishman(B-L)model and a geometrically accurate beam model.This approach simulates the blades under varied airflow condi-tions to explore the effects of wind speed acceleration and wind direction angles on flutter boundaries.Results indicate that at a rota-tional speed of 21.5 r/min,the blades exhibit instability due to bending and torsion coupling.The linear increase in wind speed ac-celeration gradually raises the critical flutter speed,which stabilizes around 24 r/min.The effect of wind direction angles is signifi-cant within a 140° sector around the turbine's rotational plane,with the critical flutter speed initially increasing and then decreas-ing,peaking at 24.9 r/min at a 60° angle.This highlights the importance of aerodynamic considerations in wind turbine blade design to prevent flutter.
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