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research-article

On the impulse produced by chord-wise flexible pitching foils in a quiescent fluid

[+] Author and Article Information
Francisco J Huera-Huarte

Department of Mechanical Engineering, Universitat Rovira i Virgili 43007 Tarragona, Spain
Francisco.huera@urv.cat

1Corresponding author.

ASME doi:10.1115/1.4038168 History: Received June 08, 2017; Revised September 28, 2017

Abstract

A parametric study is presented in this paper, showing the impulsive performance of foils with different flexural stiffness, pitching in a quiescent flow. A wide range of Reynolds numbers (different imposed kinematics) and foil rigidities is covered, depicting how flexibility effects on impulse, are more important at the largest Reynolds numbers. The impulsive performance of the system is derived from direct thrust force measurements. Passive flexibility alters vortex strength and formation in the wake of the pitching foil. These changes in the wake formation can be used to explain the differences in the measured impulses. The wake dynamics is studied after quantitative analysis of particle image velocimetry data, and it is linked to the momentum transfer generated by the foil.

Copyright (c) 2017 by ASME
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