Influences of yawed conditions on the wake evolution and recovery of axial flow tidal turbines

Conference paper


Yang, Z. 2021. Influences of yawed conditions on the wake evolution and recovery of axial flow tidal turbines. 14th European Wave and Tidal Energy Conference. Plymouth, UK 05 - 09 Sep 2021 Technical Committee of the European Wave and Tidal Energy Conference .
AuthorsYang, Z.
TypeConference paper
Abstract

Effects of yawed approaching flows on the
wake structure of axial-flow tidal turbines are not fully
understood. To obtain a better understanding, numerical
studies of a laboratory-scale three-bladed horizontal axis
tidal turbine at tip speed ratio TSR=5.2 with yaw angles of
zero and 15◦ have been carried out to investigate the wake
characteristics of the turbine in the near- and far wake.
A hybrid approach coupling Large Eddy Simulation (LES)
with Actuator Line Modelling (ALM) has been employed
in the present study. The predicted results confirm the
asymmetry of the turbine wake in which it is inclined
to the direction where the rotor is yawed. This study
quantitatively explains the reason of wake deflection and
shows that transition occurs earlier on one side of the wake,
leading to quicker wake recovery on that side. This study
also reveals that at yawed conditions the axial velocity
component of flow at the turbine plane unexpectedly varies
in the circumferential direction.

KeywordsAxial flow tidal turbines; LES; ALM
Year2021
Conference14th European Wave and Tidal Energy Conference
JournalThe 14th European Wave and Tidal Energy Conference
PublisherTechnical Committee of the European Wave and Tidal Energy Conference
ISSN2309-1983
Accepted author manuscript
License
File Access Level
Controlled
Web address (URL) of conference proceedingshttps://energy.soton.ac.uk/14th-european-wave-and-tidal-energy-conference-ewtec-2021/
Output statusPublished
Publication dates
Online01 Dec 2021
Sep 2021
Publication process dates
Deposited08 Apr 2022
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https://repository.derby.ac.uk/item/95zv6/influences-of-yawed-conditions-on-the-wake-evolution-and-recovery-of-axial-flow-tidal-turbines

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