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How does the rotational direction of an upwind turbine affect its downwind neighbour?

Englberger, Antonia and Wrba, Linus and Dörnbrack, Andreas and Lundquist, Julie K. (2022) How does the rotational direction of an upwind turbine affect its downwind neighbour? Journal of Physics: Conference Series, 2265 (2), 022048. Institute of Physics (IOP) Publishing. doi: 10.1088/1742-6596/2265/2/022048. ISSN 1742-6588.

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Official URL: https://dx.doi.org/10.1088/1742-6596/2265/2/022048

Abstract

Wind-turbine blades rotate in clockwise direction looking downstream on the rotor. During daytime conditions of the atmospheric boundary layer, the rotational direction has no influence on the turbine wakes. In stably stratified conditions occurring during night, the atmospheric inflow is often characterized by a veering inflow describing a clockwise wind direction change with height in the Northern Hemisphere. A changing wind direction with height interacting with the rotor impacts its wake characteristics (wake elongation, width and deflection). We investigate the impact on the turbine performance (streamwise velocity for power, turbulence kinetic energy for loading) of a downwind turbine considering the four possible combinations of rotational directions of two 5 MW NREL rotors by means of large-eddy simulations. A counterclockwise rotating upwind turbine results in a 4.1% increase of the rotor averaged inflow velocity at the downwind rotor in comparison to a common clockwise rotating upwind turbine rotor. In case of two counterclockwise rotating rotors, the increase is 4.5%. This increase in streamwise velocity is accompanied by a 3.7% increase in rotor averaged turbulence kinetic energy. The performance difference of the downwind rotor (+4.8% increase of cumulative power of both wind turbines, if the upwind rotor rotates counterclockwise) results from the rotational direction dependent amplification or weakening of the spanwise and the vertical wind components, which is the result of the superposition of veering inflow and upwind rotor rotation.

Item URL in elib:https://elib.dlr.de/190042/
Document Type:Article
Title:How does the rotational direction of an upwind turbine affect its downwind neighbour?
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Englberger, AntoniaDLR, IPAUNSPECIFIEDUNSPECIFIED
Wrba, LinusDLR, IPAUNSPECIFIEDUNSPECIFIED
Dörnbrack, AndreasDLR, IPAUNSPECIFIEDUNSPECIFIED
Lundquist, Julie K.University of Colorado Boulder, Boulder, USAUNSPECIFIEDUNSPECIFIED
Date:May 2022
Journal or Publication Title:Journal of Physics: Conference Series
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Volume:2265
DOI:10.1088/1742-6596/2265/2/022048
Page Range:022048
Publisher:Institute of Physics (IOP) Publishing
Series Name:Journal of Physics
ISSN:1742-6588
Status:Published
Keywords:Wind turbine, rotational direction
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Photovoltaics and Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Englberger, Antonia
Deposited On:14 Nov 2022 11:56
Last Modified:14 Dec 2023 11:36

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