A numerical study was conducted to examine the impact of rotor solidity and blade number on the aerodynamic performance of small wind turbines. Blade element momentum theory and lifting line based wake theory were utilized to parametrically assess the effects of blade number and solidity on rotor performance. Increasing the solidity beyond what is traditionally used for electric generating wind turbines led to increased power coefficients at lower tip speed ratios, with an optimum between 3 and 4. An increase in the blade number at a given solidity also increased the maximum for all cases examined. The possibility of a higher aerodynamic power extraction from solidity or blade number increases could lead to a higher overall system power production. Additional advantages over current 5% to 7% solidity, high speed designs would include lower noise, lower cut-in wind speed, and less blade erosion.
Numerical Implications of Solidity and Blade Number on Rotor Performance of Horizontal-Axis Wind Turbines
Contributed by the Solar Energy Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, February 17, 2003; final revision, July 11, 2003. Associate Editor: D. Berg.
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Duquette , M. M., and Visser, K. D. (November 26, 2003). "Numerical Implications of Solidity and Blade Number on Rotor Performance of Horizontal-Axis Wind Turbines ." ASME. J. Sol. Energy Eng. November 2003; 125(4): 425–432. https://doi.org/10.1115/1.1629751
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