Numerical and experimental investigation on aeroelasticity of wind turbine blade with biological airfoil and V‑stripe web

With the development of horizontal axis wind turbines, the problem of blade tremors under wind load becomes increasingly prominent, increasing the risk of blade fatigue fracture. To improve the flutter problem, a wind turbine blade with biological airfoil and V-stripe web is proposed based on similar criteria. The comparison of vibration and deformation between the bionic blade and the original blade of the 5 MW wind turbine is investigated by numerical calculation and model experiment. The fluid-structure interaction method and the Shear Stress Transport (SST) k-ω turbulence model with closed Reynolds-averaged Navier-Stokes. Equations are adopted in the numerical calculation. The modal analysis and harmonic response analyses of the blades are carried out. Numerical results show that the maximum deflection of the bionic blade is reduced by 14.89% compared with the original blade. Meanwhile, the aeroelastic vibration displacements, velocities, accelerations, and strains of the original and bionic blades were tested. Experimental data indicate that the tip deflection of the bionic blade is reduced by 54.74% compared with the original blade. Bionic blade show better aeroelastic deformation performance, which can improve the lifespan of the blade.