Wake synergies enhance performance in aeroelastic vibration energy harvesting
Wake synergies enhance performance in aeroelastic vibration energy harvesting
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DOI：
10.1177/1045389x12443599
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发表时间：
2012-07-01
影响因子：
2.7
通讯作者：
Garcia, Ephrahim
中科院分区：
文献类型：
--
作者：
Bryant, Matthew;Mahtani, Ranjeev L.;Garcia, Ephrahim
该研究实验表明，紧密间隔的气动弹性颤振能量收集器阵列可以利用协同尾流相互作用来优于相同数量的隔离运行的收集器。每个能量收集器的飘动运动将振荡的涡旋尾迹引入设备的下游流动。用两个和四个颤振能量采集器阵列进行的风洞实验表明，这种尾迹结构对尾迹装置的振动幅值、频率和输出功率有显著影响。这些尾迹相互作用的影响随收割机之间的顺流和跨流分离距离而变化。在确定的距离范围内，器件之间出现了有利的频率锁定。当这种情况发生时，尾部收割机可以从上游收割机的尾迹中提取额外的能量，从而在尾部装置中产生更大的振荡幅度和更高的功率输出。本文提出并讨论了由于这些尾流相互作用而导致的功率输出变化的特性以及确定能量收集器的最佳间距的实验。烟丝流可视化技术用于研究尾迹结构和阵列相互作用的机理。
This study experimentally demonstrates that a closely spaced array of aeroelastic flutter energy harvesters can exploit synergistic wake interactions to outperform the same number of harvesters operating in isolation. The fluttering motion of each energy harvester imparts an oscillating vortex wake into the flow downstream of the device. Wind tunnel experiments with arrays of two and four flutter energy harvesters show that this wake structure has significant effects on the vibration amplitude, frequency, and power output of the trailing devices. These wake interaction effects are shown to vary with the stream-wise and cross-stream separation distance between the harvesters. Over a defined range of separations, an advantageous frequency lock-in between the devices arises. When this occurs, the trailing harvesters can extract additional energy from the wake of upstream harvesters, causing larger oscillation amplitudes and higher power output in the trailing devices. Experiments to characterize this variation in power output due to these wake interaction effects and to determine the optimal spacing of the energy harvesters are presented and discussed. Smoke-wire flow visualization is used to examine the wake structure and investigate the mechanism of the array interactions.