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Analysis and design of horizontal axis wind rotors twister blades
Horizontal axis wind turbines utilize airfoil characteristics such as twist distribution, cord length, and camber to generate lift force that is on the blade plane and perpendicular to the blade axis. The shaft of the electric generator within a horizontal axis wind turbine is mainly driven by the lift force to produce clean and renewable electric power. For each airfoil, there exists an optimal angle of attack to generate the maximum lift force for the airfoil design. When a horizontal axis wind turbine blade is designed with fixed twist, the airfoil and angle of attack are specifically chosen to maximize the torque generated by the blade. In the operation of a horizontal axis wind turbine, the wind speed changes with time, which makes a conventional blade generate less lift force than an optimized blade. To improve the power conversion efficiency of a horizontal axis wind turbine blade, adjusting its angle of attack for individual airfoil segment is needed. In this research, the National Renewable Energy Laboratory (NREL) 5MW offshore reference blade is used to study the effects of the optimized twist configurations across a range of tip speed ratios. The twist configuration of a wind turbine blade is adjusted for a particular tip speed ratio. A twist configuration is chosen such that each blade airfoil has a maximum ratio between lift and drag forces. Three optimal twist configurations are generated in this research for three different tip speed ratios. Four rotors that have the reference and three optimal twist configurations are modeled and simulated. The dynamic torque values and power conversion coefficients of the four rotors under different tip speed ratios are obtained from the simulation data. The results show that the power conversion coefficients of the three rotors that have the optimal twist configurations are significantly above those of the reference rotor.
Analysis and design of horizontal axis wind rotors twister blades
Horizontal axis wind turbines utilize airfoil characteristics such as twist distribution, cord length, and camber to generate lift force that is on the blade plane and perpendicular to the blade axis. The shaft of the electric generator within a horizontal axis wind turbine is mainly driven by the lift force to produce clean and renewable electric power. For each airfoil, there exists an optimal angle of attack to generate the maximum lift force for the airfoil design. When a horizontal axis wind turbine blade is designed with fixed twist, the airfoil and angle of attack are specifically chosen to maximize the torque generated by the blade. In the operation of a horizontal axis wind turbine, the wind speed changes with time, which makes a conventional blade generate less lift force than an optimized blade. To improve the power conversion efficiency of a horizontal axis wind turbine blade, adjusting its angle of attack for individual airfoil segment is needed. In this research, the National Renewable Energy Laboratory (NREL) 5MW offshore reference blade is used to study the effects of the optimized twist configurations across a range of tip speed ratios. The twist configuration of a wind turbine blade is adjusted for a particular tip speed ratio. A twist configuration is chosen such that each blade airfoil has a maximum ratio between lift and drag forces. Three optimal twist configurations are generated in this research for three different tip speed ratios. Four rotors that have the reference and three optimal twist configurations are modeled and simulated. The dynamic torque values and power conversion coefficients of the four rotors under different tip speed ratios are obtained from the simulation data. The results show that the power conversion coefficients of the three rotors that have the optimal twist configurations are significantly above those of the reference rotor.
Analysis and design of horizontal axis wind rotors twister blades
McGuire, Joseph (author)
2020-08-01
Miscellaneous
Electronic Resource
English
DDC:
690
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