Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 51, Issue -, Pages 279-290Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2013.08.010
Keywords
Flutter; Vortex shedding; Energy harvesting; Smoke flow visualisation; Phase lag
Funding
- Australian Research Council (ARC) [LP100200034]
- Australian Research Council [LP100200034] Funding Source: Australian Research Council
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The flow structures downstream of a fluttering piezoelectric energy harvester are examined, since 40% increases in power output have been noted from a downstream harvester. Smoke wire flow visualisation with a novel bi-lighting technique, and simultaneous voltage measurements are used to understand this phenomenon. The bi-lighting technique helped to confirm the out-of-plane velocity fields caused by the tilted cone vortices shed from the upstream harvester. It was speculated that the time-varying local pressure gradients induced by the propagating vortices coupled beneficially with the free-stream dynamic pressure and flutter instabilities, acting to elevate the flutter amplitude of the downstream harvester. Also, the phase lag between the harvesters showed a nonlinear relationship with the free-stream wind speed. (C) 2013 Elsevier Inc. All rights reserved.
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