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Thu Duc, Vietnam

Tam Nguyen H.-D.,National Chung Hsing University | Pham H.-T.,city Nong Lam University | Wang D.-A.,National Chung Hsing University
Journal of Wind Engineering and Industrial Aerodynamics | Year: 2013

A proof-of-concept of a miniature pneumatic energy generator for harnessing energy from Kármán vortex street behind bluff bodies is presented. It converts flow energy into electrical energy by piezoelectric conversion with oscillation of a piezoelectric film. The tandem arrangement of the bluff bodies is designed to enhance the amplitude of the pressure fluctuation in the vortex street, which vibrates the piezoelectric fdefilm. Prototypes of the energy generator are fabricated and tested. Experimental results show that an open circuit output voltage of 14m Vp and an average output power of 0.59nW are generated when the pressure oscillates with an amplitude of nearly 70Pa and a frequency of about 872Hz. This energy harvesting approach has the potential of converting the flow energy of compressed air in a pipeline into electricity for powering wireless sensing devices. Future design guidelines for increasing the electrical power output are suggested based on analyses. © 2013 Elsevier Ltd. Source

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