Preprints
https://doi.org/10.5194/wes-2024-95
https://doi.org/10.5194/wes-2024-95
09 Aug 2024
 | 09 Aug 2024
Status: a revised version of this preprint is currently under review for the journal WES.

Spatio-temporal behavior of the far-wake of a wind Turbine model subjected to harmonic motions: Phase averaging applied to Stereo-PIV measurements

Antonin Hubert, Boris Conan, and Sandrine Aubrun

Abstract. The complex dynamics introduced by floating platforms present new challenges in the study of wind turbine wakes, and numerous questions remain unresolved due to the early stage of this technology and limited operational experience. Previous studies showed that harmonic motions with realistic amplitude and frequency and under a modelled atmospheric boundary layer have no significant impact on time-averaged values, but that frequency signatures are still visible in spectra of wake parameters. The purpose of this work is to shed light on the spatio-temporal behaviour of the wake during imposed surge, heave and pitch harmonic motions. Wind tunnel experiments on the wake of a porous disc immersed in a modelled marine atmospheric boundary layer were performed and a phase-averaging method with kernel smoothing was applied to the data to extract the harmonic response of the wake. A quasi-steady-state analysis was carried out, showing that the phase-averaged observations appear to be larger than simple steady wake model predictions and revealing the dynamic nature of the wake responses to the motions. Thus, distinct wake dynamic hypotheses are formulated depending on the nature of the motion: (i) for heave, the wake is translated vertically while maintaining its integrity and containing the same power; (ii) for surge, the wake contracts and expands without any displacement of its centre localisation, accompanied with in-phase power modulation; (iii) and for pitch, the wake dynamics include both heave and surge impacts, with a vertical translation of the wake synchronised with crosswise wake surface and power modulations.

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Antonin Hubert, Boris Conan, and Sandrine Aubrun

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-2024-95', Anonymous Referee #1, 26 Aug 2024
  • RC2: 'Comment on wes-2024-95', Anonymous Referee #2, 16 Oct 2024
Antonin Hubert, Boris Conan, and Sandrine Aubrun
Antonin Hubert, Boris Conan, and Sandrine Aubrun

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Short summary
The paper aims to study the far-wake of a wind turbine under realistic inflow conditions subjected to harmonic floating motions. The present work show that phase-averaging enables the observation of the coherent spatio-temporal wake behaviour in response to the harmonic motions, on contrary to previous studies with time-averaging, and that the resulting variations of the chosen metrics exhibit an intensity higher than those expected by using basic quasi-steady-state approaches.
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