A Piezoelectric Energy Harvester Based on Pressure Fluctuations in Kármán Vortex Street

1. A Piezoelectric Energy Harvester Based on Pressure Fluctuations in Kármán Vortex Street Dung-An Wang, Huy-Tuan Pham, Chia-Wei Chao, Jerry M. Chen National Chung Hsing University Taichung, Taiwan May 13, 2011

2. National Chung Hsing University

3. National Chung Hsing University

4. The Karma Feng Sui

5. Components of ancient feng shui • Healthy homes • Sustainability • Environment

6. Energy harvesting from water flow

7. Design

8. Fabrication

9. Experiment

10. Experimental setup

11. Result

12. Result

13. Result

14. Discussion • The output power of the device is relatively low. • An open circuit output voltage of 0.12 Vpp in average and an instantaneous output power of 0.7 nW for the pressure oscillates with an amplitude of ~0.3 kPa and a frequency of ~52 Hz. • Dimensions and structure of the device can be optimized to increase output power. • A piezoelectric material with higher piezoelectric constants can be adopted. • Operate at the resonance frequency.

15. Discussion • The resonance frequency of the energy harvesting device can be tailored to the shedding frequency of the Kármán vortex street in order to increase the output power • For random and broadband ambient flow sources, a structure with multiple resonant frequencies may also be considered, an array of the device.

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