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, 22 (4), 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/ | ||||||
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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: |
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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 | ||||||
Volume: | 22 | ||||||
DOI : | 10.1002/we.2304 | ||||||
Page Range: | pp. 1-15 | ||||||
Editors: |
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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 (old) | ||||||
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: | 19 Nov 2021 20:36 |
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