Harvesting energy from two-degree-of-freedom flutter requires large-amplitude steady-state oscillations, but the post-critical behaviour of this aeroelasic instability is still an open issue. The present study attempts to improve its scientific understanding and to supply information for the design of more unstable solutions for energy-harvesting applications. In this framework, the energy extraction was simulated through additional damping in the transverse motion component. Then, the influence of some governing parameters was explored through wind-tunnel tests and parametric linear analyses. It was found that a small mass unbalance downstream of the elastic centre is fundamental to anticipate the instability and to get unstable the system also in the presence of high damping levels. Moreover, the still-air frequency ratio is the main responsible for the magnitude of the pitching-to-heaving amplitude ratio. Increments of heaving damping significantly affect the motion amplitude and condition the optimal position of the elastic axis. Finally, the post-critical response seems to be little affected by the flow turbulence, suggesting the high potentiality of flutter-based generators for applications in real-flow environments.

Wind tunnel tests on the post-critical response of classical-flutter-based generators / Pigolotti, Luca; Mannini, Claudio; Bartoli, Gianni. - In: PROCEDIA ENGINEERING. - ISSN 1877-7058. - ELETTRONICO. - 199:(2017), pp. 3480-3485. (Intervento presentato al convegno 10th European Conference on Structural Dynamics EURODYN 2017 tenutosi a Roma nel 10-13 September 2017) [10.1016/j.proeng.2017.09.458].

Wind tunnel tests on the post-critical response of classical-flutter-based generators

PIGOLOTTI, LUCA
;
MANNINI, CLAUDIO;BARTOLI, GIANNI
2017

Abstract

Harvesting energy from two-degree-of-freedom flutter requires large-amplitude steady-state oscillations, but the post-critical behaviour of this aeroelasic instability is still an open issue. The present study attempts to improve its scientific understanding and to supply information for the design of more unstable solutions for energy-harvesting applications. In this framework, the energy extraction was simulated through additional damping in the transverse motion component. Then, the influence of some governing parameters was explored through wind-tunnel tests and parametric linear analyses. It was found that a small mass unbalance downstream of the elastic centre is fundamental to anticipate the instability and to get unstable the system also in the presence of high damping levels. Moreover, the still-air frequency ratio is the main responsible for the magnitude of the pitching-to-heaving amplitude ratio. Increments of heaving damping significantly affect the motion amplitude and condition the optimal position of the elastic axis. Finally, the post-critical response seems to be little affected by the flow turbulence, suggesting the high potentiality of flutter-based generators for applications in real-flow environments.
2017
Proceedings of 10th European Conference on Structural Dynamics
10th European Conference on Structural Dynamics EURODYN 2017
Roma
10-13 September 2017
Pigolotti, Luca; Mannini, Claudio; Bartoli, Gianni
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1093424
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