Dynamic inflow effects in measurements and high-fidelity computations
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Published:2018-08-22
Issue:2
Volume:3
Page:545-551
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ISSN:2366-7451
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Container-title:Wind Energy Science
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language:en
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Short-container-title:Wind Energ. Sci.
Author:
Pirrung Georg RaimundORCID, Madsen Helge AagaardORCID
Abstract
Abstract. 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.
Publisher
Copernicus GmbH
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
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