Hybrid wave/current energy harvesting with a flexible piezoelectric plate
Hybrid wave/current energy harvesting with a flexible piezoelectric plate
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使用柔性压电板进行混合波/电流能量收集
DOI：
10.1017/jfm.2023.583
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发表时间：
2023
影响因子：
3.7
通讯作者：
Shoele, Kourosh
中科院分区：
文献类型：
--
作者：
Shoele, Kourosh
研究了近自由表面的柔性压电板在入射的重力波和海流作用下的动力学和能量产生能力。推导出一个理论模型，其中的旗帜和它的尾流表示与涡线，而身体的流体被认为是无粘的。该模型用于描述柔性板、尾流、重力波和水流之间的水动力相互作用。该模型揭示了两个不同的振动状态的压电器件对应于几乎相似的最佳能量生产水平。第一个是与悬臂颤振模式的板，有限的依赖于板的灵活性在不同的弗劳德数和入射波频率。另一个类似于更灵活的板中的流致扑动模式，能量输出显示出对板柔性的更高依赖性。这两种能量模式的同时存在允许调节板长度，以在不同的流动条件下一致地实现最大能量产生水平。的弗劳德数的系统的响应的作用进行了探索和相关的重力波群的表面上的外观，每个传播不同的波数。它示出的浸没深度小于一半的身体长度是需要达到高能量的条件下，在亚临界和临界流。最后，最佳电感和电阻值与流量、机械和电气时间尺度之间的适当匹配有关。
We investigate the dynamics and energy production capability of a flexible piezoelectric plate submerged close to the free surface and exposed to incident head gravity waves and current. A theoretical model is derived in which the flag and its wake are represented with a vortex line while the body of the fluid is considered to be inviscid. The model is employed to describe the hydrodynamic interactions between a flexible plate, its wake, gravity incident waves and the current. The model reveals two distinct vibration states of a piezoelectric device corresponding to almost similar optimal energy production levels. The first is associated with the cantilever fluttering mode of the plate, with limited dependency on the plate's flexibility across different Froude numbers and incoming wave frequencies. The other resembles the flow-induced flapping mode in more flexible plates, with the energy output showing a higher dependency on plate flexibility. The concurrent existence of these two energetic modes allows adjustment of the plate length to consistently achieve the maximum energy production level across different flow conditions. The role of the Froude number of the system's responses is explored and correlated to the appearance of gravity wave groups on the surface, each propagating with a different wavenumber. It is shown that a submergence depth of less than half of the body length is required to reach a high energetic condition in subcritical and critical flows. Finally, the optimal inductive and resistive values are related to proper matching between flow, mechanical and electrical time scales.
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