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RESEARCH PAPERS

A Simplified Free Wake Method for Horizontal-Axis Wind Turbine Performance Prediction

[+] Author and Article Information
A. A. Afjeh, T. G. Keith

Department of Mechanical Engineering, University of Toledo, Toledo, Ohio

J. Fluids Eng 108(4), 400-406 (Dec 01, 1986) (7 pages) doi:10.1115/1.3242595 History: Received April 26, 1985; Online October 26, 2009

Abstract

Based on the assumption that wake geometry of a horizontal-axis wind turbine closely resembles that of a hovering helicopter, a method is presented for predicting the performance of a horizontal-axis wind turbine. A vortex method is used in which the wake is composed of an intense tip-vortex and a diffused inboard wake. Performance parameters are calculated by application of the Biot-Savart law along with the Kutta-Joukowski theorem. Predictions are shown to compare favorably with values from a more complicated full free wake analysis and with existing experimental data, but require more computational effort than an existing fast free wake method.

Copyright © 1986 by ASME
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