Hydrokinetic piezoelectric energy harvesting by wake induced vibration

被引：44
|
作者：
Zhao, Daoli [1 ]
Zhou, Jie [1 ]
Tan, Ting [2 ]
Yan, Zhimiao [3 ]
Sun, Weipeng [1 ]
Yin, Junlian [2 ]
Zhang, Wenming [2 ]
机构：
[1] Xian Univ Technol, State Key Lab Ecohydraul Northwest Arid Reg, Xian 710048, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mech Engn, State Key Lab Mech Syst & Vibrat, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Naval Architecture Ocean & Civil Engn, State Key Lab Ocean Engn, Shanghai 200240, Peoples R China
来源：
ENERGY | 2021年 / 220卷 / 220期
关键词：
Wake-induced vibration; Hydrokinetic piezoelectric energy harvester; Circulating water channel; Flow pattern; Reattachment;
D O I：
10.1016/j.energy.2020.119722
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
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/m(3), 596.4W/m(3), 1074W/m(3), 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. (c) 2020 Elsevier Ltd. All rights reserved.
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页数：16
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