Abstract
The purpose of the present study is to design a micro scale composite wind turbine blade. The blade airfoil of FFA-W3-211 was selected to meet Korean weather condition. The skin-spar-foam sandwich type structure was adopted for improving buckling and vibration damping characteristics. The design loads were determined at wind speed of 25m/s, and the structural analysis was performed to confirm safety and stability from strength, buckling and natural frequency using the finite element analysis method. The prototype was manufactured using the hand-lay up method and it was experimentally tested using the three point concentrated loading method. In order to evaluate the design results, it was compared with experimental results. According to comparison results, the estimated results such as compressible stress, max tip deflection, natural frequency and buckling load factor were well agreed with the experimental results.
Highlights
This study carried out the design and analysis on the aerodynamics and structures of a composite blade for a 500W-class micro scale horizontal-axis wind turbine with low wind speed starting characteristics and airfoils of excellent aerodynamic performance so that it could be applied to the geography of Korea.It was designed to be advantageous to the area of low wind speed by determining low wind speed as rated wind speed as much as possible within a range that the blade's diameter does not excessively become larger
The design loads were determined at wind speed of 25m/s, and the structural analysis was performed to confirm safety and stability from strength, buckling and natural frequency using the finite element analysis method
The estimated results such as compressible stress, max tip deflection, natural frequency and buckling load factor were well agreed with the experimental results
Summary
This study carried out the design and analysis on the aerodynamics and structures of a composite blade for a 500W-class micro scale horizontal-axis wind turbine with low wind speed starting characteristics and airfoils of excellent aerodynamic performance so that it could be applied to the geography of Korea.It was designed to be advantageous to the area of low wind speed by determining low wind speed as rated wind speed as much as possible within a range that the blade's diameter does not excessively become larger. This study carried out the design and analysis on the aerodynamics and structures of a composite blade for a 500W-class micro scale horizontal-axis wind turbine with low wind speed starting characteristics and airfoils of excellent aerodynamic performance so that it could be applied to the geography of Korea. The FAA-W3-211 airfoil which characteristics such as Reynolds number, maximum lift coefficient, stall angle of attack, maximum lift-drag ratio and maximum thickness are relatively good was used, and according to the strip theory that uses the momentum theory and blade element theory together, the basic shape was designed to determine its airfoil's chord length and wing's torsion angle distribution. The finite element method was used to analyze stress and strain, and a local buckling problem by the bending load was considered. The stability in operation was considered by checking its natural frequency
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