In this work, the authors present a two-dimensional computational model for predicting the aeroelastic response as well as the output power of vertically arranged harvesters by taking into account all aerodynamic interactions. The piezo-aeroelastic framework consists of the following: (1) an aerodynamic model based on the unsteady vortex-lattice method to compute the aerodynamic forces; (2) a discrete parameter model for each harvester with 3 degrees of freedom (plunge motion, pitch motion, and the voltage generated by the piezoelectric effect); (3) an inter-model connection to exchange information between models at each time step; and (4) a numerical scheme based on the Hamming’s fourth-order predictor–corrector method to integrate all the governing equations in the time domain. The results obtained allow us to infer new insights into the flutter onset as well as the post-critical behavior of harvester arrangements. An interesting finding is that the flutter speed is significantly decreased as the distance between the harvesters is reduced. The results suggest the strong possibility of effective energy extraction at low flow speeds using properly distributed harvester arrangements. However, in post-critical conditions, the output power is significantly enhanced as the free-stream speed is increased.

中文翻译：

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气动耦合压电采集器的计算研究

在这项工作中，作者提出了一个二维计算模型，通过考虑所有空气动力学相互作用来预测垂直排列的收割机的气动弹性响应和输出功率。压电-气动弹性框架由以下部分组成： (1) 基于非定常涡-晶格法计算气动力的气动模型；(2) 每个收割机的离散参数模型，具有 3 个自由度（俯冲运动、俯仰运动和压电效应产生的电压）；(3) 模型间连接，用于在每个时间步的模型之间交换信息；(4) 基于汉明四阶预测器-校正器方法的数值方案，用于在时域中对所有控制方程进行积分。获得的结果使我们能够推断出对颤振开始以及收割机布置的后临界行为的新见解。一个有趣的发现是，随着收割机之间的距离减小，颤振速度显着降低。结果表明，使用适当分布的收割机布置在低流速下有效提取能量的可能性很大。然而，在后临界条件下，随着自由流速度的增加，输出功率显着增强。结果表明，使用适当分布的收割机布置在低流速下有效提取能量的可能性很大。然而，在后临界条件下，随着自由流速度的增加，输出功率显着增强。结果表明，使用适当分布的收割机布置在低流速下有效提取能量的可能性很大。然而，在后临界条件下，随着自由流速度的增加，输出功率显着增强。