Author, as appears in the article.: Huera-Huarte, Francisco J
Department: Enginyeria Mecànica
URV's Author/s: Huera Huarte, Francisco Javier
Keywords: Vortex wakes Vortex formation Swimming Pitching foils Free surface Bio-inspired propulsion vortex wakes thrust swimming pitching foils mechanics free surface dynamics
Abstract: A series of experiments reveal the non-linear relationship between the propulsive performance of a pitching foil and its distance to the free surface. An especially designed robotic device allowed to sinusoidally actuate a symmetric NACA 0021 profile, with its shaft being perpendicular to the free surface, at different separations from it, whilst measuring hydrodynamic loads, power and efficiency. Digital Particle Image Velocimetry (DPIV) was used to study the flow structures around the flapping system, to better understand the performance trends observed. Efficiency dropped more than a 40% when the foil was placed at a distance of approximately 5 to 10% of the span of the system, as a consequence of a large decrease in thrust and a large increase in power, both clearly linked to wake formation.
Thematic Areas: Water resources Oceanography Ocean engineering Interdisciplinar Environmental engineering Engineering, ocean Engineering, marine Engineering, civil Engenharias iv Engenharias iii Engenharias i Ciências ambientais Biodiversidade
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: francisco.huera@urv.cat
Author identifier: 0000-0002-5447-3183
Record's date: 2024-10-12
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://www.sciencedirect.com/science/article/pii/S0029801823000471
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Ocean Engineering. 272 113663-
APA: Huera-Huarte, Francisco J (2023). Pitching foil propulsion performance decays near the free surface. Ocean Engineering, 272(), 113663-. DOI: 10.1016/j.oceaneng.2023.113663
Article's DOI: 10.1016/j.oceaneng.2023.113663
Entity: Universitat Rovira i Virgili
Journal publication year: 2023
Publication Type: Journal Publications
Repositori URV