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Impact of wall roughness and turbulence level on the performance of a horizontal axis wind turbine with the U‐RANS solver THETA

Länger-Möller, Annika (2019) Impact of wall roughness and turbulence level on the performance of a horizontal axis wind turbine with the U‐RANS solver THETA. Wind Energy, pp. 1-15. Wiley. DOI: 10.1002/we.2304 ISSN 1095-4244

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Official URL: https://doi.org/10.1002/we.2304

Abstract

The presented work investigates the impact of different sheared velocity profiles in the atmospheric boundary layer on the characteristics of a wind turbine by modifying the wall roughness coefficients in the logarithmic velocity profile. Moreover, the rotor and wake characteristics in dependence of the turbulence boundary conditions are investigated. In variant I, the turbulence boundary conditions are defined in accordance to the logarithmic velocity profile with different wall roughness lengths. In variant II, the turbulent kinetic energy and turbulent viscosity remain independent of the velocity profile and represent the free‐stream turbulence level. With an increase of the shear in the velocity profile, the amplitudes in the 3/rev characteristics of rotor thrust and rotor torque, induction factors, and effective angles of attack are increased. In variant I, the overall levels of thrust coefficient are hardly affected by the velocity profiles resulting from different wall roughness length values. The power coefficient is reduced about 1%. Conversely, compared with variant II, a difference of 2% in the power coefficient has been detected. Moreover, the wake recovery process strongly depends on the turbulence boundary condition. Simulations are carried out on an industrial 900‐kW wind turbine with the incompressible U‐RANS solver THETA.

Item URL in elib:https://elib.dlr.de/126432/
Document Type:Article
Title:Impact of wall roughness and turbulence level on the performance of a horizontal axis wind turbine with the U‐RANS solver THETA
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Länger-Möller, Annikaannika.laenger (at) dlr.dehttps://orcid.org/0000-0003-1599-3239
Date:31 January 2019
Journal or Publication Title:Wind Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1002/we.2304
Page Range:pp. 1-15
Editors:
EditorsEmail
UNSPECIFIEDJohn Wiley & Sons, Ltd.
Publisher:Wiley
ISSN:1095-4244
Status:Published
Keywords:Atmospheric boundary layer, horizontal axis wind turbine, incompressible U-RANS solver THETA, logarithmic inflow profile, turbulence model boundary conditions, wall roughness value
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
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, BS
Deposited By: Seyfried, Beate
Deposited On:11 Feb 2019 11:17
Last Modified:11 Feb 2019 11:17

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