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Flow structures in wake of a pile-supported horizontal axis tidal stream turbine
Zhang, J. Lin, X. Wang, R. Zhang, C. Zhang, Y.
Zhang, J.
Lin, X.
Wang, R.
Zhang, C.
Zhang, Y.
Publication Date
2020-03
End of Embargo
Supervisor
Rights
© 2020 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license.
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2019-10-05
Institution
Department
Awarded
Embargo end date
Additional title
Abstract
This study presents results from laboratory experiments to investigate the wake structure in the lee side of a scaled three-bladed horizontal axis tidal stream turbine with a mono-pile support structure. Experiments are conducted for a range of approaching flow velocity and installation height of rotor. Analysis of the results shows that bed shear stress increases with the increase of approaching velocity and decrease of installation height within 2D (D is the diameter of the rotor) downstream of the rotor. The flow field within 2D downstream of the rotor is greatly influenced by the presence of nacelle and mono-pile. Low stream-wise flow velocity and large turbulence intensity level is detected along the flume center right behind the nacelle and mono-pile from 1D to 2D downstream of the rotor. Stream-wise velocity at the blade tip height lower than the nacelle increases sharply from 1D to 2D and gradually grows afterwards. Correspondingly, the turbulence intensity decreases quickly from 1D to 2D and slowly afterwards. Large bed shear stress is measured from 1D to 2D, which is closely related to turbulence induced by the mono-pile. It is also found that the presence of the mono-pile might make the flow field more ‘disc-shaped’.
Version
Accepted manuscript
Citation
Zhang J, Lin X, Wang R et al (2020) Flow structures in wake of a pile-supported horizontal axis tidal stream turbine. Renewable Energy. 147(1): 2321-2334.
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Type
Article