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To perform long endurance military missions, small, unattended sensors must generate and harvest power from their surroundings.
Experiments have shown that a flexible membrane, made from piezoelectric material, can be excited in a flag-like fashion by the von
Karman vortex street forming behind a bluff body to produce power to trickle charge a battery. The image shows the vortical
structures exciting the membrane.
The work was sponsored by the National Science Foundation.
Reference:
Allen, J. J. & Smits, A. J. Energy Harvesting Eel. Journal of Fluids and Structures 15 2001, pp 629-640
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