A Pipe Airflows Piezoelectric Energy Harvester with Longitudinal Vibration Excited by Vortex Shedding

doi:10.3901/JME.2019.08.024

Abstract

Abstract: To meet the demands of pipe flows monitoring system for self-power and solve the problem of effective excitation of a piezoelectric vibrator in a flow-rate/direction constant and space-limited pipe flows environment, a novel pipe airflows piezoelectric energy harvester (PAPEH) with longitudinal vibration excited by vortex shedding is presented. Introduce the system composition and operational principle of the PAPEH, and carry out theoretical and experimental studies. The results show that the average drag has a quadratic relationship with flow rates and diameter ratios, and it reduces the amplitude of the piezoelectric vibrator when it is too large; The average drag factor increases with the diameter ratios and finally stabilize to 6.23; Other parameters are determined, respectively, there is the optimal flow rate and the optimal diameter ratio to maximize the output voltage, when the resistor is 240 kΩ, the flow rate is 32 m/s, the diameter ratio is 0.93, and the output power reaches 1.25 mW. Therefore, improving the output power should determine a reasonable diameter ratio and load based on the actual flow rates range. Proper increase the diameter ratio at low flow rates and reduction in diameter ratio at high flow rates help to increase power generation capacity.

Key words: longitudinal vibration energy harvester, piezoelectric, pipe airflows, self-excited, vortex shedding

CLC Number:

TN384
TM619

WANG Shuyun, FU Jiawei, KAN Junwu, CHEN Song, ZHANG Zhonghua, LIANG Cheng. A Pipe Airflows Piezoelectric Energy Harvester with Longitudinal Vibration Excited by Vortex Shedding[J]. Journal of Mechanical Engineering, 2019, 55(8): 24-29.

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