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Changing the rotational direction of a wind turbine under veering inflow: a parameter study

Englberger, Antonia and Lundquist, Julie K. and Dörnbrack, Andreas (2020) Changing the rotational direction of a wind turbine under veering inflow: a parameter study. Wind Energy Science, 5 (4), pp. 1623-1644. Copernicus Publications. doi: 10.5194/wes-5-1623-2020. ISSN 2366-7443.

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Official URL: https://wes.copernicus.org/articles/5/1623/2020/

Abstract

All current-day wind-turbine blades rotate in clockwise direction as seen from an upstream perspective. The choice of the rotational direction impacts the wake if the wind profile changes direction with height. Here, we investigate the respective wakes for veering and backing winds in both hemispheres by means of large-eddy simulations. We quantify the sensitivity of the wake to the strength of the wind veer, the wind speed, and the rotational frequency of the rotor in the Northern Hemisphere. A veering wind in combination with counterclockwise-rotating blades results in a larger streamwise velocity output, a larger spanwise wake width, and a larger wake deflection angle at the same downwind distance in comparison to a clockwise-rotating turbine in the Northern Hemisphere. In the Southern Hemisphere, the same wake characteristics occur if the turbine rotates counterclockwise. These downwind differences in the wake result from the amplification or weakening or reversion of the spanwise wind component due to the effect of the superimposed vortex of the rotor rotation on the inflow's shear. An increase in the directional shear or the rotational frequency of the rotor under veering wind conditions increases the difference in the spanwise wake width and the wake deflection angle between clockwise- and counterclockwise-rotating actuators, whereas the wind speed lacks a significant impact.

Item URL in elib:https://elib.dlr.de/137968/
Document Type:Article
Title:Changing the rotational direction of a wind turbine under veering inflow: a parameter study
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Englberger, AntoniaDLR, IPAUNSPECIFIED
Lundquist, Julie K.University of Colorado Boulder, Boulder, Colorado, USAhttps://orcid.org/0000-0001-5490-2702
Dörnbrack, AndreasDLR, IPAhttps://orcid.org/0000-0003-0936-0216
Date:November 2020
Journal or Publication Title:Wind Energy Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:5
DOI :10.5194/wes-5-1623-2020
Page Range:pp. 1623-1644
Publisher:Copernicus Publications
ISSN:2366-7443
Status:Published
Keywords:wind-turbine wake, veering wind, rotational direction, LES
HGF - Research field:Energy
HGF - Program:Renewable Energies
HGF - Program Themes:Wind Energy
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Wind Energy (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Transport Meteorology
Deposited By: Englberger, Antonia
Deposited On:23 Nov 2020 16:02
Last Modified:23 Nov 2020 16:02

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