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Hydrodynamic characteristics of wing-in-ground effect oscillating hydrofoilon power extraction performance

Lookup NU author(s): Professor Pengfei LiuORCiD

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).


Abstract

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.


Publication metadata

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

Data Access Statement: Data will be made available on request.


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Funding

Funder referenceFunder name
2019KJN003
Fundamental Research Funds for the Central Universities, China
HIT.OCEF. 2021037
Taishan Scholars Project of Shandong Province
tsqn201909172
University young innovational team program, Shandong Province

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