Energy-harvesting performance of tandem coupled-pitching hydrofoils under the semi-activated mode: An experimental study

Zhen Liu, Hengliang Qu, Xinyu Song, Zhengshou Chen and Heqiang Ni

Energy, 2023, vol. 279, issue C

Abstract: A tandem setup can theoretically enhance the hydrodynamic and energy-harvesting performance of a flapping hydrofoil system. In this study, an experimental model test on tandem coupled-pitching hydrofoils under the semi-activated mode was conducted in a water channel. The effects of the activated pitching amplitude and damping load condition on the flow structure in the wake region and the performance of the tandem system were also compared with those of the single upstream hydrofoil (USH) and downstream hydrofoil (DSH). Compared to the single hydrofoils, the overall flow velocity in the wake region of the tandem hydrofoils was significantly reduced, and the vortex structure was more complicated. In addition, the tandem hydrofoils improved the self-starting capability of the system. The normalized analysis in a synthetic comparison indicated that the tandem hydrofoils had limited effects on enhancing the torque coefficient and could improve the passive pitching angular velocity. Under a constant damping load condition, the system installed with tandem hydrofoils obtained peak power coefficient and efficiency of 1.11 and 30.0%, respectively. For the tandem hydrofoils, compared to the single USH and DSH, the peak power coefficient was enhanced by 65.7% and 48.0%, respectively, and the efficiency was enhanced by 48.0% and 15.4%, respectively.

Keywords: Tandem hydrofoils; Coupled-pitching; Semi-activated; Experimental study; Flow structure; Energy-harvesting performance (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544223014548
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:279:y:2023:i:c:s0360544223014548

DOI: 10.1016/j.energy.2023.128060

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().