Abstract
This paper reports a flapping water flow energy harvester. It consists of a bluff body and a cantilever based resonator. The bluff body facing the water flow creates mechanical instability. The bluff body can control forces and pressures applied to the tip of the resonator, i.e. a wing, so a continuous and stable oscillations of the resonator can be achieved. Key parameters for initiating and maintaining such oscillation include position and size of the bluff body as well as the angle of attack. These parameters were simulated in ANSYS and simulation results were verified experimentally. In order to test the energy harvesting capability of this structure in water, a MFC patch was attached to the cantilever and output power was measured when the harvester was placed in laminar water flow with the speed of 1 m/s. A maximum power of 52 µW was recorded.
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