Hydrokinetic piezoelectric energy harvesting by wake induced vibration

Daoli Zhao, Jie Zhou, Ting Tan, Zhimiao Yan, Weipeng Sun, Junlian Yin and Wenming Zhang

Energy, 2021, vol. 220, issue C

Abstract: Piezoelectric energy harvesters capture various kinetic energy to power wireless sensors. A new hydrokinetic piezoelectric energy harvester using wake-induced vibration (WIV) is proposed in this paper. The mathematical model of the hydrokinetic energy harvester is established to consider the effect for different velocity regions. Circulating water-channel experiment is carried out to exam the performance of the harvester. The experimental results show that the model can predict the output power appropriately. Frequency analysis indicates that the performances in VIV region and WIV region are dominated by the wake vortex frequency and the natural frequency respectively. The flow pattern changes greatly under different spacings which are divided into extended-body, reattachment and co-shedding regions. The maximum output power of the harvester locates in the reattachment region. The maximum experimental power densities for the inverted D-shaped, circular and D-shaped cylinders are 570.3W/m3, 596.4W/m3, 1074W/m3, respectively. They are 43.2, 25.3, 31 times of that without wake interference. The corresponding optimal experimental spacing ratios are 5, 2.6 and 2, respectively. Compared with the case without wake interference, the output power of the hydrokinetic piezoelectric energy harvester using WIV is significantly improved.

Keywords: Wake-induced vibration; Hydrokinetic piezoelectric energy harvester; Circulating water channel; Flow pattern; Reattachment (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (11)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328292

DOI: 10.1016/j.energy.2020.119722

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