Power output enhancement of a ducted wind turbine by stabilizing vortices around the duct

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article numberen12163171
JournalEnergies
Volume12
Issue number16
DOIs
Publication statusPublished - Aug 18 2019

Fingerprint

Wind Turbine
Wind turbines
Ducts
Vortex
Vortex flow
Enhancement
Output
Wind Energy
Turbine
Wind power
Stabilization
Turbines
Diffusers (fluid)
Numerical Simulation
Diffuser
Wind Tunnel
Computer simulation
Periodicity
Wind tunnels
Lens

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

Power output enhancement of a ducted wind turbine by stabilizing vortices around the duct. / Watanabe, Koichi; Ohya, Yuji; Uchida, Takanori.

In: Energies, Vol. 12, No. 16, en12163171, 18.08.2019.

Research output: Contribution to journalArticle

@article{c757263df2104d60aaa8da75d32a92c3,
title = "Power output enhancement of a ducted wind turbine by stabilizing vortices around the duct",
abstract = "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.",
author = "Koichi Watanabe and Yuji Ohya and Takanori Uchida",
year = "2019",
month = "8",
day = "18",
doi = "10.3390/en12163171",
language = "English",
volume = "12",
journal = "Energies",
issn = "1996-1073",
publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",
number = "16",

}

TY - JOUR

T1 - Power output enhancement of a ducted wind turbine by stabilizing vortices around the duct

AU - Watanabe, Koichi

AU - Ohya, Yuji

AU - Uchida, Takanori

PY - 2019/8/18

Y1 - 2019/8/18

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85071620212&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85071620212&partnerID=8YFLogxK

U2 - 10.3390/en12163171

DO - 10.3390/en12163171

M3 - Article

AN - SCOPUS:85071620212

VL - 12

JO - Energies

JF - Energies

SN - 1996-1073

IS - 16

M1 - en12163171

ER -