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Open AccessArticle

Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct

1
Kyushu University Platform of Inter/Transdisciplinary Energy Research (Q-PIT), Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
2
Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga 816-8580, Japan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(16), 3171; https://doi.org/10.3390/en12163171
Received: 8 June 2019 / Revised: 7 August 2019 / Accepted: 14 August 2019 / Published: 18 August 2019
(This article belongs to the Section Wind, Wave and Tidal Energy)
A brimmed-diffuser augmented turbine (called a wind lens turbine: WLT) actively uses vortices around the brim to enhance its power output. However, the vortices are usually unstable and asymmetric. This study attempted to stabilize the vortices to enhance the power output of a WLT. Then, we investigated new approaches using vortex stabilization plates and polygonal brims in wind tunnel experiments and numerical simulations. Both approaches achieved a 1.5–3.8% increase in power output compared with a standard WLT. Our numerical simulations revealed a periodicity existing in a fluctuating vortex structure on the circular brim. Importantly, vortex stabilization plates and polygonal brims must be the same periodic scale to suppress the vortex fluctuation and stabilize the vortices effectively. In addition, a larger brim tended to enhance the stabilizing effects. We believe that this discovery provides an easy way to increase the power output of existing wind turbines. It is particularly important in light of advances in wind energy technology and the increasing wind energy market. View Full-Text
Keywords: brimmed-diffuser augmented wind turbine (B-DAWT); vortex stabilization plates; polygonal brim; power enhancement brimmed-diffuser augmented wind turbine (B-DAWT); vortex stabilization plates; polygonal brim; power enhancement
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MDPI and ACS Style

Watanabe, K.; Ohya, Y.; Uchida, T. Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct. Energies 2019, 12, 3171.

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