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Adaptive wind energy harvester with transformable bluff body

机译：自适应风能收割机与可变形的虚张机

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摘要

A novel adaptive wind energy harvester with a transformable bluff body responsive to external wind velocity is proposed in this study. This study is inspired by our finding that when an external wind velocity is lower than a specific (threshold) wind velocity, the energetic performance of an energy harvester with a certain crosssectional shape of the bluff body is better than that with another shape and the reverse is true when the external wind speed is greater than the threshold. More specifically, the bluff body considered in the present study is composed of a prismatic cylinder and its cross-sectional shape is a triangle when the external wind velocity is below a certain threshold value. However, when the wind velocity exceeds the threshold value, the cross-sectional shape of the bluff body transforms into a W-shape in response to the wind velocity. In this study, an appropriate design process to develop the proposed system is established, and a physical prototype is fabricated. Thereafter, an associated mathematical model is developed and experimentally validated. The energetic and dynamic performances of the proposed system are thoroughly investigated and compared to systems with bluff bodies in three fixed cross-sectional shapes (square, triangle, and W-shape). As a result, the percentage increase ratio in the output power of the proposed energy harvester is found to be 23% higher than that of the system with a triangular bluff body, which is known to provide the best performance. This result indicates that the proposed system remarkably improves the energetic performance in comparison to the conventional system.
机译：在本研究中提出了一种具有响应于外部风速的可变形虚张机的新型自适应风能收割机。本研究的灵感来自我们发现，当外部风速低于特定的（阈值）风速时，凹槽体的某种横截面形状的能量收割机的能量性能优于另一种形状和反向的。当外部风速大于阈值时是真的。更具体地，在本研究中考虑的虚张体由棱柱形圆柱组成，并且当外部风速低于某个阈值时，其横截面形状是三角形。然而，当风速超过阈值时，凹槽体的横截面形状响应于风速而变换成W形。在该研究中，建立了开发所提出的系统的适当设计过程，并制造物理原型。此后，开发了相关的数学模型并通过实验验证。彻底研究了所提出的系统的能量和动态性能，并与具有三个固定横截面形状（方形，三角形和W形）的虚空体的系统进行了彻底调查。结果，发现所提出的能量收割机的输出功率的百分比增加率比具有三角形虚张机体的系统高出23％，这已知是提供最佳性能。该结果表明，与传统系统相比，所提出的系统显着提高了能量性能。

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