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Published on Nov 24, 2011
A flexible mylar beam is hit by a vortex ring in air. The beam is coated with a thin piezoelectric (PVDF) layer and furnished with two couples of strain gages. A 6DoF balance is used for measuring forces and moments on the beam. The vortex ring is generated using a "vortex cannon". Piezoelectric voltage, strain signal and the force & moment data are recorded in sync with a high speed camera observing the flow field at 3000 fps. The length of the beam is 100 mm. Advection speeds of the first and the second vortices are around 3.5 m/s and 1.1 m/s, respectively.
Particle image velocimetry (PIV) on the recorded images will be correlated to the measured data to develop a model to predict the power output of piezoelectric energy harvesters subject to turbulent flows.