On loading fluctuations induced by energetic large-scale motions for horizontal axis wind turbines

Journal article


Ahmadi, M. and Yang, Z. 2022. On loading fluctuations induced by energetic large-scale motions for horizontal axis wind turbines. Physics of Fluids. 34 (7), pp. 1-14. https://doi.org/10.1063/5.0096164
AuthorsAhmadi, M. and Yang, Z.
Abstract

The interaction of horizontal axis wind turbines (HAWTs) and large-scale energetic flows is not fully understood. The unsteady flow approaching turbines could result in highly unsteady blade forces and root bending moments (RBMs) which would have a strong influence on the turbine's operational life span, especially for large-scale wind turbines. To provide a better understanding of this interaction, numerical simulations of a three-bladed HAWT with a cylinder located at its upstream to produce energetic motions of varying scale relative to the turbine size have been carried out to examine the temporary variations of the turbine root bending moments. The predicted spectra reveal that the energetic large-scale motions produced by the cylinder strongly interact with the instantaneous blade forces and, thus, root bending moments. It specifically shows how dominant large-scale motions approaching the turbine significantly influence the spectral characteristics of flapwise and edgewise RBMs in terms of level and trend. The comparison shows that below about half of the blade passage frequency, RBMs spectra correlate well with those of upstream velocity, whereas above this frequency, RBMs spectra are mainly influenced by the turbine rotational frequency. This study also shows that the strong scale-to-scale interaction between the upstream flow and turbine loading reported previously does not appear at high Reynolds numbers in the present study.

KeywordsLarge eddy simulation; Wind turbines; Large-scale motions
Year2022
JournalPhysics of Fluids
Journal citation34 (7), pp. 1-14
PublisherAIP Publishing
ISSN1070-6631
Digital Object Identifier (DOI)https://doi.org/10.1063/5.0096164
Web address (URL)https://aip.scitation.org/doi/full/10.1063/5.0096164
Output statusPublished
Publication dates
Online05 Jul 2022
Publication process dates
Accepted13 Jun 2022
Deposited02 Sep 2022
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