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

• 渡邉, 康一

  九州大学エネルギー研究教育機構

• 大屋, 裕二

  九州大学応用力学研究所

• 内田, 孝紀

  九州大学応用力学研究所

抄録

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.

収録刊行物

• Energies

  Energies 12 (16), 3171-1-3171-16, 2019-08-18

  MDPI

キーワード

• brimmed-diffuser augmented wind turbine (B-DAWT)
• vortex stabilization plates
• polygonal brim
• power enhancement

詳細情報

• CRID: 1050017057727980800
• NII論文ID: 120006776695
• ISSN: 19961073
• HANDLE: 2324/2547326
• 本文言語コード: en
• 資料種別: journal article
• データソース種別:
  • IRDB
  • CiNii Articles