Vortex Sheet Analysis of the Giromill

[+] Author and Article Information
R. E. Wilson

Department of Mechanical Engineering, Oregon State University, Corvallis, Oregon

J. Fluids Eng 100(3), 340-342 (Sep 01, 1978) (3 pages) doi:10.1115/1.3448677 History: Received August 30, 1977; Online October 12, 2010


A two-dimensional analysis of the performance and flowfield of the Giromill is presented. The Giromill is a vertical-axis wind turbine with straight blades that are articulated to produce maximum energy extraction from the wind. It is found that the power coefficient and windwise force coefficient for the Giromill have the same limit as obtained for the horizontal-axis wind turbine. A cross-wind force is also obtained with this type of wind turbine. The cross-wind force is of second order and decreases with tip speed. Streamlines and velocity profiles are illustrated for several loading conditions.

Copyright © 1978 by ASME
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