Tham khảo tài liệu 'wind turbines part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 70 Wind Turbines a jackfruit b Aleurites moluccana c Ficus altissima Fig. 11. The topology network of plant leaf d ficus viren Adaptive blade design based on vein structure of plant leaf The similarity between the plant leaf vein and the wind turbine blade can be explained as followings 1. Structure and environment both of the plant leaf and the blade are cantilever structure working in natural environment and mainly suffer from wind load. 2. The Inner topology structure the plant leaf has the principal vein and the lateral vein and the lateral vein locates symmetrically at bi-lateral sides of the principal vein Contrastively large wind turbine blade is usually designed or configured as spanwise spar a set of shear webs and composite skin structure which is similar to the topology pattern of plant leaf. The design intention of large wind turbine blade is also obvious that is the spanwise spar is mainly used to carry the centrifugal force and the self weight and the shear webs are used to carry the shear wind force. It is not hard to see that the adaptive growth of plant leaf is driven by stress environment and it can be used as a general guide to design wind turbine blade because of the similar working environment and structure requirement. Blade optimization and bionic design for wind turbine The baseline blade is originally developed by the institute of renewable energy research of Shan Tou University for MW wind turbine which is illustrated in a Xin 2005 . The length of the blade is 34m and the airfoils are derived from Wortmann FX77 79Mod 71 Adaptive Bend-Torsional Coupling Wind Turbine Blade Design Imitating the Topology Structure of Natural Plant Leaves airfoil series where the first airfoil profile position begins at from root part whose detailed profile parameters and design operating case have been thoroughly documented by Han 2008 . In order to prevent big deformation of blade tip from influencing the accuracy of calculation
