Abuan, B. and Howell, R.J. orcid.org/0000-0002-0142-9728 (2019) The performance and hydrodynamics in unsteady flow of a horizontal axis tidal turbine. Renewable Energy, 133. pp. 1338-1351. ISSN 0960-1481
Abstract
This paper presents the effect of idealised unsteady tidal velocities on the performance of a newly-designed Horizontal-Axis Tidal Turbine (HATT) through the use of numerical simulations using Computational Fluid Dynamics (CFD). Simulations are conducted using ANSYS FLUENT implementing the Reynolds-Averaged Navier Stokes (RANS) equations to model the fluid flow problem. A steady flow case is modelling in a 2 m/s stream flow and the resulting performance curve was used as the basis of comparison for the unsteady flow simulations. A decrease in performance was seen for the unsteady flow simulation around peak TSR (TSR=6) which has a cyclic-averaged coefficient of performance (CP) of 37.50% compared to the steady CP of 39.46%. Similar decreases in performance with unsteady flow was observed away from the peak performance TSR at TSR=4 and TSR=8. Furthermore, with unsteady flow that it was found that as the TSR increases, the difference between the cyclic-averaged CP and the steady flow CP drops. The effect of variations in the frequency and amplitude of the unsteady flow showed that a decrease in the cyclic-averaged CP was observed and this performance reduced with increasing frequency and increasing amplitude of unsteady incoming flows. For the cases studied here, unsteady flows are detrimental to the performance of the tidal turbine.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2018 Elsevier Ltd. This is an author produced version of a paper subsequently published in Renewable Energy. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/) |
Keywords: | Horizontal axis tidal turbine (HATT); Unsteady flow; Hysteresis curve; Coefficient of performance (CP); Computational fluid dynamics (CFD) |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 25 Sep 2018 11:14 |
Last Modified: | 21 Sep 2019 00:38 |
Published Version: | https://doi.org/10.1016/j.renene.2018.09.045 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.renene.2018.09.045 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135908 |
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Filename: Abuan and Howell - Accepted Manuscript - 15th Sept 2018.pdf
Licence: CC-BY-NC-ND 4.0