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RESEARCH PAPERS

Darrieus Rotor Aerodynamics in Turbulent Wind

[+] Author and Article Information
M. T. Brahimi, I. Paraschivoiu

Department of Mechanical Engineering, École Polytechnique de Montréal, C. P. 6079, Succ. Centre Ville, Montréal, PQ H3C 3A7, Canada

J. Sol. Energy Eng 117(2), 128-136 (May 01, 1995) (9 pages) doi:10.1115/1.2870839 History: Received January 01, 1994; Received November 01, 1994; Online February 14, 2008

Abstract

The earlier aerodynamic models for studying vertical axis wind turbines (VAWT’s) are based on constant incident wind conditions and are thus capable of predicting only periodic variations in the loads. The purpose of the present study is to develop a mode capable of predicting the aerodynamic loads on the Darrieus rotor in a turbulent wind. This model is based on the double-multiple streamtube method (DMS) and incorporates a stochastic wind model The method used to simulate turbulent velocity fluctuations is based on the power spectral density. The problem consists in generating a region of turbulent flow with a relevant spectrum and spatial correlation. The first aerodynamic code developed is based on a one-dimensional turbulent wind model. However, since this model ignores the structure of the turbulence in the crossflow plane, an extension to three dimensions has been made. The computer code developed, CARDAAS, has been used to predict aerodynamic loads for the Sandia-17m rotor and compared to CARDAAV results and experimental data. Results have shown that the computed aerodynamic loads have been improved by including stochastic wind into the aerodynamic model.

Copyright © 1995 by The American Society of Mechanical Engineers
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