Published In

Journal of Fluid Mechanics

Document Type

Article

Publication Date

4-21-2021

Subjects

Wind turbines -- Case studies

Abstract

Misaligned wind turbine rotors redirect the wake, and manipulate the wake shape by introducing a counter-rotating vortex pair. This mechanism is of great interest for improving wind farm power output through static or dynamic misalignment. In this study, cross-plane stereo-particle image velocimetry measurements are used to characterize the wake evolution for tilt misalignment and verify differences with yaw misalignment. Blockage from the ground, shear in the velocity profile, turbulence levels, hub-vortices and tip-vortices are found to strongly affect wake evolution for a tilted wind turbine resulting in a non-symmetric behaviour for upwards deflecting or downwards deflecting tilt. The downwards deflection of a negatively tilted wind turbine is found to result in the most benefits for wake recovery and power availability downstream through increased wake-curling, faster wake-recovery, and downdraft of high-momentum flow.

Rights

© The Author(s), 2021.

Creative Commons License

Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License, which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited

DOI

10.1017/jfm.2021.237

Persistent Identifier

https://archives.pdx.edu/ds/psu/35524

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