Numerical study of the effect of surface grooves on the aerodynamic performance of a NACA 4415 airfoil for small wind turbines,” J. , Google Scholar CrossrefĪerodynamic performance enhancement of horizontal axis wind turbines by dimples on blades: Numerical investigation,” Energyġ95, 117056 (2020). , Google Scholar CrossrefĪssessment of the dimples as passive boundary layer control technique for laminar airfoils operating at wind turbine blades root region typical Reynolds numbers,” Energyġ70, 102– 111 (2019). , Google Scholar CrossrefĪerodynamic optimization and experiment of horizontal axis wind turbine for low wind speed,” Trans. Renewable energy strategies for sustainable development,” Energyģ2(6), 912– 919 (2007). Compared with the prototype blade and bionic airfoil blade, the pressure difference between the windward surface and the leeward surface of the bionic coupling blade is larger. The herringbone groove structure enhances the flow attachment by generating vortices, which reduces the pressure on the leeward surface of bionic coupling blades. The larger curvature of leading edge of blades leads to larger flow velocity, which leads to the smaller pressure on the leeward surface. Results show that the power coefficient (Cp) of bionic airfoil blades is higher than that of prototype blade in the TSR of 6–9 the Cp of bionic coupling blades is higher than that of bionic airfoil blades in the TSR of 6–10. These simulations utilize an incompressible Reynolds-averaged Navier–Stokes solver and shear stress transport k–ω turbulent model at different tip speed ratios (TSRs). Numerical simulation is utilized to study the aerodynamic performance of all blades. The design of bionic coupling blade is based on bionic airfoil blade, which is coupled with the herringbone groove structure. The design of bionic airfoil blade is based on 50% and 70% cross section airfoils of owl wing, which is combined with the parameters of the prototype blade. The blade of A 200 W horizontal axis wind turbine is taken as prototype blade. This paper is mainly to demonstrate a bionic design for wind turbine blades inspired by the airfoil of owl wing and the herringbone groove structure of owl feathers. The advantage of wind energy is significant to the improvement of energy structure.
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