期刊
JOURNAL OF FLUIDS AND STRUCTURES
卷 109, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jfluidstructs.2021.103454
关键词
Flutter; Oscillating foil; Fluid-structure interaction; Energy harvesting
资金
- Ministerio de Ciencia e Innovacion of Spain [PID2019-104938RB-I00]
- Universidad de Malaga/CBUA
This study investigates flutter instability based on aerodynamic forces on a flexible foil and uses springs and dampers for fixation at a pivot axis. The results can guide the search for energy extraction by a fully-passive flexible flapping-foil hydrokinetic turbine within specific parameters.
The aerodynamic forces on an oscillating flexible foil are used to study the flutter instability when the flexible foil is elastically mounted to translational and torsional springs and dampers at an arbitrary pivot axis. The present linear theory, valid for small amplitudes of the heaving, pitching and flexural deflection motions, and therefore valid for sufficiently large stiffness ratios, characterizes analytically the onset of the flutter instability and the corresponding leading frequency in terms of the flow velocity and all the structural parameters of the system. The analysis may serve to guide the search for the parametric ranges of energy extraction by a fully-passive flexible flapping-foil hydrokinetic turbine, including the effect of some relevant nondimensional parameters which have not been considered before. The results for the rigid-foil case are validated with recent numerical simulations for a fully-passive flapping-foil turbine. As the stiffness of the foil decreases, the coupled-mode flutter instability of the elastically supported rigid foil may weaken and disappear, or become enhanced, depending on the remaining parameters, most particularly on the location of the centre of mass in relation to the pivot point, whose dependence is investigated for specific values of the rest of the nondimensional parameters. (C)& nbsp;2021 The Author(s). Published by Elsevier Ltd.& nbsp;
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