Experimental study of dynamic response of passive flapping hydrofoil in regular wave

Journal article (2023)

Authors

Junxian Wang Cranfield University
Sabin Santhosh Cranfield University
Oriol Colomés Offshore Engineering - CEG
Matteo Capaldo TotalEnergies
Liang Yang Cranfield University
Research Group
Offshore Engineering (CEG) (TU Delft)
Copyright: © 2023 Junxian Wang, Sabin Santhosh, Oriol Colomés, Matteo Capaldo, Liang Yang
DOI
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https://doi.org/10.1063/5.0157890
Fluid dynamics Sensors Energy harvesting Wave power Spring stiffness Wave mechanics
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Published Date

2023

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Hydraulic Engineering

Research Group

Offshore Engineering

Abstract

The hydrofoil harnesses wave energy and converts it into thrust. In this paper, we present the results of the first experimental study investigating the dynamic behavior of a fully passive foil with spring-loaded pitch and heave in regular waves. Our study shows that the real-time load signal is multi-harmonic with strong superposition, directly proving the robust energy harvesting performance due to the restoring springs. By interpreting the hydrofoil's pose and path from an image sequence captured underwater, we conclude the dynamic evolution of the fully passive hydrofoil interacting with regular waves. The hydrofoil's dynamics exhibit asymmetric surge, pitch, and heave in a motion cycle. Furthermore, we employ a pixel capturing algorithm with self-correction utility to quantify the hydrofoil's forward displacement from the image sequence of the moving carriage. These findings provide valuable insight into the performance and potential of hydrofoils for marine propulsion.