Aerodynamic Loads on a Darrieus Rotor Blade

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

Mechanical Engineering, Oregon State University, Corvallis, Oreg. 97331

P. B. S. Lissaman

AeroVironment, Inc., Pasadena, Calif.

M. James

Phoenix, Ariz.

W. R. McKie

Climatic Research Institute, Oregon State University, Corvallis, Oreg.

J. Fluids Eng 105(1), 53-58 (Mar 01, 1983) (6 pages) doi:10.1115/1.3240940 History: Received March 04, 1982; Online October 26, 2009


A free-vortex analysis of a Darrieus rotor blade in nonsteady motion has been developed. The method uses the circle theorem to map a moving airfoil into the circle plane. The wake is modeled using point vortices. Nascent vortex strength and position are determined from the Kutta condition so that the nascent vortex has the same strength as a vortex sheet of uniform strength. The force on the airfoil is determined by two methods, integration of the pressure over the plate and from the impulse of the wake vortices. Both methods yield the same numerical results. A comparison with an analytical solution for a plunging airfoil gives excellent agreement. Results are shown for a one-bladed Darrieus Rotor at a tip speed ratio of three and two chord sizes. The numerical results indicate that the forces and moment on a Darrieus Rotor blade may be adequately approximated by quasisteady relationships although accurate determination of the local velocity and circulation are still required.

Copyright © 1983 by ASME
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