Flutter Characteristics of Wind Turbine Blades with V-Stripe Web

With the development of large-scale wind turbine, the blade has become longer and flexible. The flutter of blades has an important effect on blade failure. Inspired by birds, the V-stripe structure on the wings of typical birds has been extracted and used for blade to improve the flutter of blade. The width, depth-to-diameter ratio and spacing of V-stripe have been taken as the main parameters, and been optimized by orthogonal experiment based on numerical simulation. The optimized V-stripe has the following parameters. The width is 2 mm, the depth-to-diameter ratio is 3, and the spacing is 2 mm. Then, the V-strip structure with optimal parameters has been reconstructed on the web of wind turbine blade. The comparative study of deformation between the prototype blade and the bionic blade has been conducted by numerical simulation. Compared with the prototype blade, when the bionic blade flutter occurs, the V-shaped stripe web is continuously subjected to pressure and tension, and the energy of the blade flutter is continuously dissipated, resulting in the flutter displacement and flutter speed of the wind turbine blade decreasing. Compared with prototype blade, the bionic blade with V-striped web has anti-flutter properties, and the flutter displacement and speed of wind turbine blade have been reduced.