Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear
The wake characteristics behind a yawed model wind turbine exposed to different customized inflow conditions are investigated. Laser Doppler anemometry is used to measure the wake flow in two planes at <i>x</i>∕<i>D</i> = 3 and <i>x</i>∕<i>D</i> =...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-06-01
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| Series: | Wind Energy Science |
| Online Access: | https://www.wind-energ-sci.net/3/329/2018/wes-3-329-2018.pdf |
| _version_ | 1818515891884654592 |
|---|---|
| author | J. Bartl F. Mühle J. Schottler L. Sætran J. Peinke J. Peinke M. Adaramola M. Hölling |
| author_facet | J. Bartl F. Mühle J. Schottler L. Sætran J. Peinke J. Peinke M. Adaramola M. Hölling |
| author_sort | J. Bartl |
| collection | DOAJ |
| description | The wake characteristics behind a yawed model wind turbine exposed to different customized inflow conditions are
investigated. Laser Doppler anemometry is used to measure the wake flow in two planes at <i>x</i>∕<i>D</i> = 3 and
<i>x</i>∕<i>D</i> = 6, while the turbine yaw angle is varied from <i>γ</i> = −30° to 0° to +30°. The objective is to assess
the influence of grid-generated inflow turbulence and shear on the mean and turbulent flow components.
<br><br>
The wake flow is observed to be asymmetric with respect to negative and positive yaw angles. A counter-rotating vortex
pair is detected creating a kidney-shaped velocity deficit for all inflow conditions. Exposing the rotor to non-uniform
highly turbulent shear inflow changes the mean and turbulent wake characteristics only insignificantly. At low inflow
turbulence the curled wake shape and wake center deflection are more pronounced than at high inflow turbulence. For
a yawed turbine the rotor-generated turbulence profiles peak in regions of strong mean velocity gradients, while the
levels of peak turbulence decrease at approximately the same rate as the rotor thrust. |
| first_indexed | 2024-12-11T00:34:51Z |
| format | Article |
| id | doaj.art-e50a9e1542944adbad6bf7d26d3ad1e4 |
| institution | Directory Open Access Journal |
| issn | 2366-7443 2366-7451 |
| language | English |
| last_indexed | 2024-12-11T00:34:51Z |
| publishDate | 2018-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Wind Energy Science |
| spelling | doaj.art-e50a9e1542944adbad6bf7d26d3ad1e42022-12-22T01:27:12ZengCopernicus PublicationsWind Energy Science2366-74432366-74512018-06-01332934310.5194/wes-3-329-2018Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shearJ. Bartl0F. Mühle1J. Schottler2L. Sætran3J. Peinke4J. Peinke5M. Adaramola6M. Hölling7Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, NorwayFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, NorwayForWind, Institute of Physics, University of Oldenburg, Oldenburg, GermanyDepartment of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim, NorwayForWind, Institute of Physics, University of Oldenburg, Oldenburg, GermanyFraunhofer IWES, Oldenburg, GermanyFaculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, NorwayForWind, Institute of Physics, University of Oldenburg, Oldenburg, GermanyThe wake characteristics behind a yawed model wind turbine exposed to different customized inflow conditions are investigated. Laser Doppler anemometry is used to measure the wake flow in two planes at <i>x</i>∕<i>D</i> = 3 and <i>x</i>∕<i>D</i> = 6, while the turbine yaw angle is varied from <i>γ</i> = −30° to 0° to +30°. The objective is to assess the influence of grid-generated inflow turbulence and shear on the mean and turbulent flow components. <br><br> The wake flow is observed to be asymmetric with respect to negative and positive yaw angles. A counter-rotating vortex pair is detected creating a kidney-shaped velocity deficit for all inflow conditions. Exposing the rotor to non-uniform highly turbulent shear inflow changes the mean and turbulent wake characteristics only insignificantly. At low inflow turbulence the curled wake shape and wake center deflection are more pronounced than at high inflow turbulence. For a yawed turbine the rotor-generated turbulence profiles peak in regions of strong mean velocity gradients, while the levels of peak turbulence decrease at approximately the same rate as the rotor thrust.https://www.wind-energ-sci.net/3/329/2018/wes-3-329-2018.pdf |
| spellingShingle | J. Bartl F. Mühle J. Schottler L. Sætran J. Peinke J. Peinke M. Adaramola M. Hölling Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear Wind Energy Science |
| title | Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear |
| title_full | Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear |
| title_fullStr | Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear |
| title_full_unstemmed | Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear |
| title_short | Wind tunnel experiments on wind turbine wakes in yaw: effects of inflow turbulence and shear |
| title_sort | wind tunnel experiments on wind turbine wakes in yaw effects of inflow turbulence and shear |
| url | https://www.wind-energ-sci.net/3/329/2018/wes-3-329-2018.pdf |
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