Abstract
This work proposes an energy harvester that captures the mechanical energy caused by water flow and convert s into an electrical energy through the piezoelectric effect. A flexible piezo - film has been used as a transducer in the energy harvesting system and the kinetic energy of the water flow is produced by using the vortex induced vibration techniqu e . When pla c ing in water way the transducer is fluctuating in the vortex of the fluid flow, producing the kinetic energy of 44 W at a low fluid velocity of 6.8 m/s and low frequency of 0.4 Hz. This configuration generates a corresponding open - circuit voltage of 6.6 mV at a match ing load of 1 M , leading to the maximum output power of 0.18 W. A n efficiency power conversion of the harvesting system was evaluated to be about 4.4 %. It is possible to use the proposed unit under gravitational force where there is a difference in the levels of t he fluid no matter in water way or transporting parts such as petroleum pipe s. However, r ectifying the out put voltage generated by t he present micro generator is compulsory in order to feed small scale electronics an d communication, for instance, wireless sensor networ ks . Furthermore, multiple arrays of the piezoelectric unit are also promising for delivering higher output power. Copyright © 201 5 VBRI press.
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