A galloping energy harvester with flow attachment
A galloping energy harvester with flow attachment
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DOI：
10.1063/1.5083103
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发表时间：
2019-03
影响因子：
4
通讯作者：
S. Tucker Harvey;I. Khovanov;P. Denissenko
中科院分区：
文献类型：
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作者：
S. Tucker Harvey;I. Khovanov;P. Denissenko
气动弹性能量采集器是一种很有前途的无线传感器和微机电系统供电技术。在这封信中，我们提出了一个收割机的灵感来自颤抖的白杨叶在几乎察觉不到的风。驰振能量采集器是一个垂直于气流方向的弯曲叶片，能够在异常低的风速下产生自持振荡。收获系统的动力学进行了实验研究，并与集总参数模型进行了比较。数值模拟定量描述了实验观察到的动态行为。进行流动可视化以研究由装置产生的图案。与许多其他驰振收割机设计不同，当叶片接近其零位移位置时，发现流动附着在叶片的后表面处，因此更接近于翼型而不是传统使用的海崖体。与压电收集机构相结合的设备的模拟预测比具有方形棱镜的设备的功率输出更高。
Aeroelastic energy harvesters are a promising technology for powering wireless sensors and microelectromechanical systems. In this letter, we present a harvester inspired by the trembling of aspen leaves in barely noticeable winds. The galloping energy harvester, a curved blade oriented perpendicular to the flow, is capable of producing self-sustained oscillations at uncharacteristically low wind speeds. The dynamics of the harvesting system are studied experimentally and compared to a lumped parameter model. Numerical simulations quantitatively describe the experimentally observed dynamic behaviour. Flow visualisation is performed to investigate the patterns generated by the device. Dissimilar to many other galloping harvester designs, the flow is found to be attached at the rear surface of the blade when the blade is close to its zero displacement position, hence acting more closely to aerofoils rather than to conventionally used bluff bodies. Simulations of the device combined with a piezoelectric harvesting mechanism predict higher power output than that of a device with the square prism.