期刊
ENERGY
卷 189, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2019.116255
关键词
Flapping hydrofoil; Energy harvesting; Semi-activated; Shear flow; Controlling strategy; Numerical simulation
资金
- National Natural Science Foundation of China [51779239]
- Key Basic Program of Shandong Natural Science Funds [ZR2017ZA0202]
- Qingdao Livelihood ST Project [17-6-3-25-gx]
- Program of Introducing Talents of Discipline to Universities (111 Project) [B14028]
- Young top-notch talent project of National Ten Thousand Talent Program
The semi-activated flapping hydrofoil is a promising device for harvesting tidal stream energy in shallow water with a relatively higher efficiency. A two-dimensional numerical model, based on the computational fluid dynamics software ANSYS-Fluent, was established and validated to investigate a semi-activated hydrofoil with activated pitching and induced heaving motions in the shear flows. It was found that the hydrofoil can reach a stable stage to passively heave about an equilibrium point at various shear rates. Since the hydrofoil is pushed toward the low-velocity areas, its energy-harvesting efficiencies whether or not considering the hydrodynamic torques are lower than that in the uniform flow. Two controlling strategies were used to specifically restrict the downward motion ranges, namely a stop block or a linear spring, which demonstrated the ability to significantly increase the two efficiencies under various controlling parameters. The highest efficiencies of 0.50 and 0.52 were achieved using a linear spring at the shear rate of 2.0. (C) 2019 Elsevier Ltd. All rights reserved.
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