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Energies 2016, 9(6), 406; doi:10.3390/en9060406

Application of a Diffuser Structure to Vertical-Axis Wind Turbines

1
Department of Aeronautics and Astronautics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
2
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Lance Manuel and Rupp Carriveau
Received: 25 March 2016 / Revised: 1 May 2016 / Accepted: 16 May 2016 / Published: 25 May 2016
(This article belongs to the Special Issue Modeling and Simulation for Wind Turbine Loads Analysis)
View Full-Text   |   Download PDF [7450 KB, uploaded 25 May 2016]   |  

Abstract

The effects of using a wind acceleration device (wind lens) with vertical-axis wind turbines in wind tunnel experiments were examined. A wind lens consists of a diffuser and flanges, and this study investigated the optimum parameters of their configuration with regard to the power augmentation of the turbines. The wind lens with a flat-panel-type diffuser demonstrated power augmentation by a factor of 2.0 compared with an open wind turbine. An increase from 5° to 20° in the semi-open angle of the diffuser made it possible to generate a 30% high power output over a wide range of tip speed ratios. On that basis, an optimum semi-open angle was determined. For the flat-panel-type diffuser, a recommended diffuser length is the half of the throat width, and its semi-open angle is 20°.The inlet enhanced power augmentation over a wide range of tip speed ratios. The optimum location for the wind lens in the streamwise direction was aligned with the center of the vertical-axis wind turbines. The diffuser with a curved surface was more effective regarding power augmentation than flat-panel-type diffusers. The wind lens with a curved surface diffuser demonstrated power augmentation by a factor of about 2.1 compared with an open wind turbine. Furthermore, it was demonstrated that a two-bladed wind turbine with symmetric NACA0024-type airfoils was most suitable for the incorporation of a wind lens to generate higher power output. View Full-Text
Keywords: wind lens; vertical-axis wind turbine; wind acceleration device; wind tunnel experiment wind lens; vertical-axis wind turbine; wind acceleration device; wind tunnel experiment
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Watanabe, K.; Takahashi, S.; Ohya, Y. Application of a Diffuser Structure to Vertical-Axis Wind Turbines. Energies 2016, 9, 406.

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