27 Jan 2022
27 Jan 2022
Status: a revised version of this preprint is currently under review for the journal WES.

Experimental analysis of the effect of dynamic induction control on a wind turbine wake

Daan van der Hoek1, Joeri Frederik1, Ming Huang2, Fulvio Scarano2, Carlos Simao Ferreira2, and Jan-Willem van Wingerden1 Daan van der Hoek et al.
  • 1Delft Center for Systems and Control, Faculty of Mechanical, Maritime and Materials Engineering (3mE), Delft University of Technology, Delft, The Netherlands
  • 2Department of Aerodynamics, Wind Energy, Flight Performance and Propulsion, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands

Abstract. Dynamic induction control (DIC) has proven to be an effective method of increasing the power output for a wind farm in both simulation studies and wind tunnel experiments. By pitching the blades of a wind turbine periodically, the recovery of the low velocity wake is accelerated, thereby increasing the energy available to downstream turbines. The wake itself of a turbine operating with DIC has not yet been studied experimentally. This paper presents a wind tunnel experiment where the wake of a wind turbine under periodic excitation is investigated. Using three-dimensional particle image velocimetry, the velocity field behind the turbine was reconstructed. Analysis of the velocity fields indicated that the available power in the wake increases when using DIC. This increase was partially due to a lower average thrust force experienced by the turbine with DIC. However, a large difference was seen between measurement results and actuator disk theory, indicating enhanced recovery of the wake is contributing to the increased energy. Instantaneous measurements visualizing the development of blade tip vortices also showed how the location of vortex breakdown, which is directly related to re-energizing the wake, shifts over time with DIC. We believe this shifting location is contributing to the enhanced wake recovery of DIC, providing more energy to downstream wind turbines.

Daan van der Hoek et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-162', Anonymous Referee #1, 25 Feb 2022
  • RC2: 'Comment on wes-2021-162', Anonymous Referee #2, 14 Mar 2022
  • AC1: 'Comment on wes-2021-162', Daan van der Hoek, 21 Apr 2022

Daan van der Hoek et al.

Daan van der Hoek et al.


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Short summary
The paper presents a wind tunnel experiment where a technique called dynamic induction control was implemented on a small-scale turbine. By periodically changing the angle of the blades, the low velocity turbine wake is excited, and subsequently it recovers at a faster rate. Small particles were released in the flow and their reflections were recorded with a set of cameras. This allowed us the reconstruct the flow in the wind turbine wake, and check the effect of dynamic induction control.