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Distinct Turbulent Regions in the Wake of a Wind Turbine and Their Inflow-Dependent Locations: The Creation of a Wake Map
LHEEA (UMR 6598-CNRS), École Centrale de Nantes, 44300 Nantes, France; Institute of Physics and For Wind, University of Oldenburg, 26129 Oldenburg, Germany.ORCID iD: 0000-0002-3787-3118
Institute of Physics and For Wind, University of Oldenburg, 26129 Oldenburg, Germany.
Physics of Fluids Group, Max Planck Center Twente for Complex Fluid Dynamics, University of Twente, 7500 AE Enschede, The Netherlands.ORCID iD: 0000-0001-6976-5704
Wind Energy and Institute of Engineering, Hanzehogeschool Groningen, 9747 AS Groningen, The Netherlands; TNO Energy Transition, Wind Energy Technology, 1755 LE Petten, The Netherlands.
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2020 (English)In: Energies, E-ISSN 1996-1073, Vol. 13, no 20, article id 5392Article in journal (Refereed) Published
Abstract [en]

Wind turbines are usually clustered in wind farms which causes the downstream turbines to operate in the turbulent wakes of upstream turbines. As turbulence is directly related to increased fatigue loads, knowledge of the turbulence in the wake and its evolution are important. Therefore, the main objective of this study is a comprehensive exploration of the turbulence evolution in the wind turbine’s wake to identify characteristic turbulence regions. For this, we present an experimental study of three model wind turbine wake scenarios that were scanned with hot-wire anemometry with a very high downstream resolution. The model wind turbine was exposed to three inflows: laminar inflow as a reference case, a central wind turbine wake, and half of the wake of an upstream turbine. A detailed turbulence analysis reveals four downstream turbulence regions by means of the mean velocity, variance, turbulence intensity, energy spectra, integral and Taylor length scales, and the Castaing parameter that indicates the intermittency, or gustiness, of turbulence. In addition, a wake core with features of homogeneous isotropic turbulence and a ring of high intermittency surrounding the wake can be identified. The results are important for turbulence modeling in wakes and optimization of wind farm wake control.

Place, publisher, year, edition, pages
MDPI AG , 2020. Vol. 13, no 20, article id 5392
National Category
Energy Systems Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-368156DOI: 10.3390/en13205392ISI: 000587455900001Scopus ID: 2-s2.0-85093360802OAI: oai:DiVA.org:kth-368156DiVA, id: diva2:1987459
Note

QC 20250806

Available from: 2025-08-06 Created: 2025-08-06 Last updated: 2025-08-06Bibliographically approved

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Neunaber, Ingrid

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