Articles | Volume 6, issue 3
https://doi.org/10.5194/wes-6-715-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-6-715-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
A simplified model for transition prediction applicable to wind-turbine rotors
Thales Fava
CORRESPONDING AUTHOR
Department of Mechanics, Linné Flow Centre, SeRC, KTH Royal Institute of Technology, Stockholm, Sweden
Mikaela Lokatt
Department of Mechanics, Linné Flow Centre, SeRC, KTH Royal Institute of Technology, Stockholm, Sweden
Niels Sørensen
Department of Wind Energy, Technical University of Denmark, Risø Campus, Roskilde, Denmark
Frederik Zahle
Department of Wind Energy, Technical University of Denmark, Risø Campus, Roskilde, Denmark
Ardeshir Hanifi
Department of Mechanics, Linné Flow Centre, SeRC, KTH Royal Institute of Technology, Stockholm, Sweden
Dan Henningson
Department of Mechanics, Linné Flow Centre, SeRC, KTH Royal Institute of Technology, Stockholm, Sweden
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In standstill conditions wind turbines are at risk of vortex-induced vibrations (VIVs). VIVs can become large and lead to significant fatigue of the wind turbine structure over time. Thus it is important to have tools that can accurately compute this complex phenomenon. This paper studies the sensitivities to the chosen models of computational fluid dynamics (CFD) simulations when modelling VIVs and finds that much care is needed when setting up simulations, especially for specific flow angles.
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Short summary
This work develops a simplified framework to predict transition to turbulence on wind-turbine blades. The model is based on the boundary-layer and parabolized stability equations, including rotation and three-dimensionality effects. We show that these effects may promote transition through highly oblique Tollmien–Schlichting (TS) or crossflow modes at low radii, and they should be considered for a correct transition prediction. At high radii, transition tends to occur through 2D TS modes.
This work develops a simplified framework to predict transition to turbulence on wind-turbine...
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