Effect of hydrofoil flexibility on the power extraction of a flapping tidal generator via two- and three-dimensional flow simulations SCIE SCOPUS

Cited 18 time in WEB OF SCIENCE Cited 28 time in Scopus
Title
Effect of hydrofoil flexibility on the power extraction of a flapping tidal generator via two- and three-dimensional flow simulations
Author(s)
Le, Tuyen Quang; Ko, Jin Hwan
Publication Year
2015-08
Abstract
In this study, we investigate the effect of hydrofoil flexibility on the power extraction of a flapping tidal stream generator with hydrofoils down-scaled for a water channel in an experiment with a typical Strouhal number and frequency. The described deformations in the chord and spanwise directions are imposed onto the surfaces of the hydrofoil to analyze the flexibility effect. In a two-dimensional (2D) simulation, parameter studies of the chordwise flexure are conducted and a 30% improvement in the rate of the power-extraction efficiency is then achieved when the chordwise flexure is 20% of the chord length. In a three-dimensional (3D) simulation, the chordwise flexure of 20% achieves a 15% improvement in the rate of the power-extraction efficiency for the hydrofoil with an aspect ratio (AR) of 5, which is less than that in the 2D simulation due to 3D effects such as tip loss and a spanwise vortex. Meanwhile, the effect of the spanwise flexure on the power extraction is minor as compared to that of the chordwise flexure. It was also found throughout the parametric study of the AR variation that the 3D effect of the chordwise flexible hydrofoil is slightly stronger than that of the rigid hydrofoil. (C) 2015 Elsevier Ltd. All rights reserved.
ISSN
0960-1481
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2439
DOI
10.1016/j.renene.2015.01.068
Bibliographic Citation
RENEWABLE ENERGY, v.80, pp.275 - 285, 2015
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Subject
AERODYNAMIC PERFORMANCE; OSCILLATING FOILS
Keywords
Flapping tidal generator; Chordwise flexure; Spanwise flexure; Power-extraction efficiency; Three-dimensional effect
Type
Article
Language
English
Document Type
Article
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
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