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Approximate aerodynamic analysis for multi-blade darrieus wind turbines
Abstract An approximate analysis, which is based on the assumption of constant aerodynamic coefficients and the thigonometry of small angles, is presented. The analysis produces a performance model which consists of a series of closed-form equations. A result of the analysis is an interference factor which varies with the azimuthal angle. The model is valid for any number of blades up to six. The model predicts a power coefficient which agrees fairly well with experimental data and other models. The region of validity for the model is from the cut-in speed to rotor stall. The model predicts a variation in the upwind and downwind blade normal force. The model also predicts a power coefficient which is relatively constant with planform shape.
Approximate aerodynamic analysis for multi-blade darrieus wind turbines
Abstract An approximate analysis, which is based on the assumption of constant aerodynamic coefficients and the thigonometry of small angles, is presented. The analysis produces a performance model which consists of a series of closed-form equations. A result of the analysis is an interference factor which varies with the azimuthal angle. The model is valid for any number of blades up to six. The model predicts a power coefficient which agrees fairly well with experimental data and other models. The region of validity for the model is from the cut-in speed to rotor stall. The model predicts a variation in the upwind and downwind blade normal force. The model also predicts a power coefficient which is relatively constant with planform shape.
Approximate aerodynamic analysis for multi-blade darrieus wind turbines
William Beans, E. (author)
Journal of Wind Engineering and Industrial Aerodynamics ; 25 ; 131-150
1986-04-22
20 pages
Article (Journal)
Electronic Resource
English
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