Vortex-induced vibration (VIV) has been widely studied in the fields of vibration control, building construction, and underwater vehicles. Recently, researchers began utilizing the VIV phenomenon for flow energy harvesting. Here, we describe that vortex shedding causes periodic rotational motions and explore these vortex-induced swing (VIS) motions for harvesting flow energy and measuring flow speed. An arc-bluff structure was constructed to enlarge the VIS motions, and a phenomenological model was developed using the Van der Pol equation. Swing characteristics when flow velocities were in the range of (0.15, 0.45) m/s were assessed. Experiments showed that the maximum swing amplitude of the device is 120°, and it converges to 80° as the water velocity increases. The frequency, amplitude, and initial angle curve of the VIS device can be used to represent the water speed vector. The proposed flowmeter showed a flow rate sensitivity of 7∼10 Hz/(m·s−1) in the experimental range. Energy harvester prototypes demonstrated a peak-peak output of 3.28 V in water with a velocity of 0.45 m/s. The present work provides an approach for the flow measurement and energy harvesting under low-speed and low-frequency conditions.

中文翻译：

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用于能量收集器和流量计的涡激摆动 (VIS) 运动

涡激振动（VIV）已在振动控制、建筑施工和水下航行器等领域得到广泛研究。最近，研究人员开始利用 VIV 现象进行流动能量收集。在这里，我们描述涡旋脱落导致周期性旋转运动，并探索这些涡旋引起的摆动 (VIS) 运动以获取流动能量和测量流速。构建了一个弧形模糊结构以扩大 VIS 运动，并使用 Van der Pol 方程开发了一个现象学模型。评估流速在 (0.15, 0.45) m/s 范围内时的摆动特性。实验表明，该装置的最大摆幅为120°，随着水流流速的增加逐渐收敛到80°。频率、幅度、VIS装置的初始角度曲线可以用来表示水速矢量。所提出的流量计在实验范围内显示出 7∼10 Hz/(m·s-1) 的流速灵敏度。能量收集器原型在水中以 0.45 m/s 的速度展示了 3.28 V 的峰峰值输出。目前的工作为低速和低频条件下的流量测量和能量收集提供了一种方法。