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We report the experimental results of flow energy harvesting where the bluff
bodies with different cross-section shapes are placed at the ends of the cantilever beams.
Namely, bluff bodies as cylinders and rectangles were considered under interaction the
flowing air. The bluff bodies are coupled through the joint suspension frame where the
other cantilever ends were clamped and also additionally by vortices created in the space
between them. Finally, piezoelectric patches with corresponding electrical circuits were
attached to the cantilever beams. They transduce the mechanical energy of the beam-bluff-
body resonators into the electrical power. The resulting structure oscillated on the flowing
air with several flow velocity ranges. Higher level of oscillations caused larger voltage
response in the electric circuits. As the bluff bodies are responding differently we observed
the moderate voltage output for fairly wide velocity range. For illustration of the energy
transduction mechanism and validation of the experimental results CFD simulations were
performed. We show the differences in the vortex formation and shedding causing
vibration of mechanical structure in various conditions.
