Dynamic inflow effects in measurements and high-fidelity computations
<p>A wind turbine experiences an overshoot in loading after, for example, a collective step change in pitch angle. This overshoot occurs because the wind turbine wake does not immediately reach its new equilibrium, an effect usually referred to as dynamic inflow. Vortex cylinder models and...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-08-01
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| Series: | Wind Energy Science |
| Online Access: | https://www.wind-energ-sci.net/3/545/2018/wes-3-545-2018.pdf |
| _version_ | 1819013273401425920 |
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| author | G. R. Pirrung H. A. Madsen |
| author_facet | G. R. Pirrung H. A. Madsen |
| author_sort | G. R. Pirrung |
| collection | DOAJ |
| description | <p>A wind turbine experiences an overshoot in loading after, for
example, a collective step change in pitch angle. This overshoot occurs
because the wind turbine wake does not immediately reach its new equilibrium,
an effect usually referred to as dynamic inflow. Vortex cylinder models and
actuator disc simulations predict that the time constants of this dynamic
inflow effect should decrease significantly towards the blade tip. As part of
the NASA Ames Phase VI experiment, pitch steps have been performed on a
turbine in controlled conditions in the wind tunnel. The measured aerodynamic
forces from these experiments seemed to show much less radial dependency of
the dynamic inflow time constants than expected when pitching towards low
loading. Moreover the dynamic inflow effect seemed fundamentally different
when pitching from low to high loading, and the reason for this behavior
remained unclear in previous analyses of the experiment. High-fidelity
computational fluid dynamics and free-wake vortex code computations yielded
the same behavior as the experiments. In the present work these observations
from the experiments and high-fidelity computations are explained based on a
simple vortex cylinder wake model.</p> |
| first_indexed | 2024-12-21T01:57:20Z |
| format | Article |
| id | doaj.art-aabff5350d454e758ede266fb222c047 |
| institution | Directory Open Access Journal |
| issn | 2366-7443 2366-7451 |
| language | English |
| last_indexed | 2024-12-21T01:57:20Z |
| publishDate | 2018-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Wind Energy Science |
| spelling | doaj.art-aabff5350d454e758ede266fb222c0472022-12-21T19:19:45ZengCopernicus PublicationsWind Energy Science2366-74432366-74512018-08-01354555110.5194/wes-3-545-2018Dynamic inflow effects in measurements and high-fidelity computationsG. R. Pirrung0H. A. Madsen1Wind Energy Department, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, DenmarkWind Energy Department, Technical University of Denmark, Frederiksborgvej 399, 4000 Roskilde, Denmark<p>A wind turbine experiences an overshoot in loading after, for example, a collective step change in pitch angle. This overshoot occurs because the wind turbine wake does not immediately reach its new equilibrium, an effect usually referred to as dynamic inflow. Vortex cylinder models and actuator disc simulations predict that the time constants of this dynamic inflow effect should decrease significantly towards the blade tip. As part of the NASA Ames Phase VI experiment, pitch steps have been performed on a turbine in controlled conditions in the wind tunnel. The measured aerodynamic forces from these experiments seemed to show much less radial dependency of the dynamic inflow time constants than expected when pitching towards low loading. Moreover the dynamic inflow effect seemed fundamentally different when pitching from low to high loading, and the reason for this behavior remained unclear in previous analyses of the experiment. High-fidelity computational fluid dynamics and free-wake vortex code computations yielded the same behavior as the experiments. In the present work these observations from the experiments and high-fidelity computations are explained based on a simple vortex cylinder wake model.</p>https://www.wind-energ-sci.net/3/545/2018/wes-3-545-2018.pdf |
| spellingShingle | G. R. Pirrung H. A. Madsen Dynamic inflow effects in measurements and high-fidelity computations Wind Energy Science |
| title | Dynamic inflow effects in measurements and high-fidelity computations |
| title_full | Dynamic inflow effects in measurements and high-fidelity computations |
| title_fullStr | Dynamic inflow effects in measurements and high-fidelity computations |
| title_full_unstemmed | Dynamic inflow effects in measurements and high-fidelity computations |
| title_short | Dynamic inflow effects in measurements and high-fidelity computations |
| title_sort | dynamic inflow effects in measurements and high fidelity computations |
| url | https://www.wind-energ-sci.net/3/545/2018/wes-3-545-2018.pdf |
| work_keys_str_mv | AT grpirrung dynamicinfloweffectsinmeasurementsandhighfidelitycomputations AT hamadsen dynamicinfloweffectsinmeasurementsandhighfidelitycomputations |