Hydrodynamic advantages of a low aspect-ratio flapping foil

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A high aspect-ratio foil is known to be advantageous in terms of both thrust and efficiency in flapping propulsion. However, many species of fish have evolved a low aspect-ratio hydrofoil, which naturally leads one to search for its physical advantages in locomotion. Here we study the flow physics of a hydrofoil in angular reciprocating motion with negligible free-stream velocity to reveal the effects of an aspect ratio on hydrodynamic performance. By establishing a scaling law for the thrust of a foil of general shapes and corroborating it experimentally, we find that the thrust of an angularly reciprocating foil is maximized at a low aspect ratio of 0.7 while hydromechanical efficiency continuously increases with an aspect ratio. This result suggests that a low aspect-ratio foil can improve thrust produced by the foil when they start from rest, but at the expense of efficiency. (C) 2017 Elsevier Ltd. All rights reserved.
Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Issue Date
2017-05
Language
English
Article Type
Article
Keywords

TAIL SWIMMING PROPULSION; THRUST PERFORMANCE; VORTEX FORMATION; PITCHING PANEL; CAUDAL FIN; EFFICIENCY; FLOW; WAKE; HYDROMECHANICS; LOCOMOTION

Citation

JOURNAL OF FLUIDS AND STRUCTURES, v.71, pp.70 - 77

ISSN
0889-9746
DOI
10.1016/j.jfluidstructs.2017.03.006
URI
http://hdl.handle.net/10203/225113
Appears in Collection
ME-Journal Papers(저널논문)
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