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research article

Enhancing Wind Farm Performance through Axial Induction and Tilt Control: Insights from Wind Tunnel Experiments

Barcos, Guillem Armengol
•
Porte-Agel, Fernando  
January 1, 2024
Energies

Static axial induction control and tilt control are two strategies that have the potential to increase power production in wind farms, mitigating wake effects and increasing the available power for downstream turbines. In this study, wind tunnel experiments are performed to evaluate the efficiency of these two techniques. First, the axial induction of upstream turbines in wind farms comprising two, three, and five turbines is modified through the tip-speed ratio. This strategy is found to be ineffective in increasing power extraction. Next, the power extraction and flow through a two-turbine wind farm are evaluated, considering different tilt angles for the upstream turbine, under two levels of incoming flow turbulence intensities and turbine spacing distances. It is shown that forward tilting increases the overall power extraction by deflecting the wake downwards and promoting the entrainment of high-speed fluid in the upper shear layer, regardless of the turbine spacing distance and turbulence intensity level. Also, the wake is seen to recover faster due to the increased shear between the wake and the outer flow. Tilting a turbine backward deflects the wake upwards and pulls low-speed flow from under the turbine into the wake space, increasing the available power for downstream turbines, but it is not enough to increase global power extraction. Moreover, since the wake deflection under backward tilting is not limited by ground blockage, it leads to larger secondary steering compared with forward tilting. Finally, it is demonstrated that the secondary steering of the downstream turbine's wake influences the flow encountered by a turbine positioned farther downstream.

  • Details
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Type
research article
DOI
10.3390/en17010203
Web of Science ID

WOS:001139267500001

Author(s)
Barcos, Guillem Armengol
Porte-Agel, Fernando  
Date Issued

2024-01-01

Publisher

MDPI

Published in
Energies
Volume

17

Issue

1

Start page

203

Subjects

Technology

•

Axial Induction Control

•

Tilt Control

•

Wake

•

Entrainment

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
WIRE  
FunderGrant Number

Swiss National Science Foundation

Available on Infoscience
February 21, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/205020
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