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Lookup NU author(s): Professor Pengfei LiuORCiD
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
The energy contained in the tidal motion of the seas and oceans has the potential to be a significant source ofrenewable energy. The oscillating hydrofoil current-energy turbine has a good performance to extract energyfrom the coupling of its heaving and pitching motions. In the present study, the wing-in-ground (WIG) effect hasbeen considered to improve the power-extraction performance of the oscillating hydrofoils. The overset grid inthe commercial computational fluid dynamic (CFD) software STAR CCM+ is applied to study the flapping hydrofoilwith dynamic WIG effect between two hydrofoils. The simulation results show that the WIG effect cangreatly improve the power extraction performance of the flapping hydrofoil. The WIG effect is asymmetric overthe course of the foil moving toward or leaving from the symmetry plane. The distance of the gap has a majorinfluence on the hydrodynamic performances of the flapping hydrofoil. For a moderate gap, the positive pressureon the lower surface enhances as the hydrofoil departs from the symmetry plane and causes an improvement oflift and moment coefficients. As the gap decreases further, the increasing negative pressure between the leadingedge and the symmetry plane plays an essential role improving the power extraction as the hydrofoil approachesthe symmetry plane. Compared to the case without the WIG effect, the power-extraction efficiency has anincrement of 16.34% in the present study.
Author(s): Mo W, He G, Wang J, Zhang Z, Wang J, Liu P, Ghassemi H, Yang H
Publication type: Article
Publication status: Published
Journal: Energy Reports
Year: 2024
Volume: 11
Pages: 2991-3004
Print publication date: 01/06/2024
Online publication date: 29/02/2024
Acceptance date: 26/02/2024
Date deposited: 19/03/2024
ISSN (electronic): 2352-4847
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.egyr.2024.02.052
DOI: 10.1016/j.egyr.2024.02.052
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