STUDY ON INFLUENCE OF AERODYNAMIC DOUBLE FLAPS ON AERODYNAMIC PERFORMANCE OF VERTICAL AXIS WIND TURBINE

Aiming at the problem of aerodynamic performance degradation of vertical axis wind turbine caused by blade flow separation, based on the characteristics of bird feathers lifting slightly with gust to maintain the reattachment of airflow on its outer wing, aerodynamic flap is installed on both sides of the blade. The computational fluid dynamics method is used to study its mechanism of action on vertical axis wind turbine and its influence on aerodynamic performance and based on dynamic mode decomposition, the modal characteristics of wake flow field of vertical axis wind turbine under the action of pneumatic shrapnel are compared and analyzed. In terms of instantaneous torque, the aerodynamic double flaps significantly increase the tangential force of the vertical axis wind turbine blade and the pressure coefficient of the airfoil suction surface. At the same time, the low tip speed ratio becomes the best tip speed ratio become the best tip speed ratio, which improves the self-starting performance and stability in the operation process, thus improving the aerodynamic performance of the vertical axis wind turbine, the dynamic mode decomposition of the flow field shows that the double spring is helpful to suppress the wake vortex intensity. © 2024 Science Press. All rights reserved.