Application of a diffuser structure to vertical-axis wind turbines

Koichi Watanabe, Shuhei Takahashi, Yuji Ohya

Research output: Contribution to journalArticle

6 Citations (Scopus)

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.

Original languageEnglish
Article number406
JournalEnergies
Volume9
Issue number6
DOIs
Publication statusPublished - Jun 2016

Fingerprint

Diffuser
Wind Turbine
Wind turbines
Vertical
Lenses
Augmentation
Lens
Curved Surface
Angle
High Power
Flanges
Wind Tunnel
Output
Airfoils
Airfoil
Turbine
Wind tunnels
Range of data
Turbines
Configuration

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this

Application of a diffuser structure to vertical-axis wind turbines. / Watanabe, Koichi; Takahashi, Shuhei; Ohya, Yuji.

In: Energies, Vol. 9, No. 6, 406, 06.2016.

Research output: Contribution to journalArticle

Watanabe, Koichi ; Takahashi, Shuhei ; Ohya, Yuji. / Application of a diffuser structure to vertical-axis wind turbines. In: Energies. 2016 ; Vol. 9, No. 6.
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