Turbulence and flapping pivot axis effects on torsional flutter harvester efficiency by closed-form formula

IF 4.2 2区工程技术 Q1 ENGINEERING, CIVIL

Journal of Wind Engineering and Industrial Aerodynamics Pub Date : 2024-11-28 DOI:10.1016/j.jweia.2024.105938

Yuhui Qin, Luca Caracoglia

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引用次数: 0

Abstract

This “Short Communication” investigates the dynamics of a torsional-flutter energy harvester in atmospheric winds with stationary turbulence. This apparatus is an example of a flutter mill, which operates by exploiting aeroelastic instability as a competitive alternative and as a renewable energy supply for one or few housing units. The apparatus has a rigid blade-airfoil that rotates about a pivot to generate flapping motion. Contrary to recent studies by the second author, the effect of random stationary turbulence on flutter onset is examined by an analytical approach, employed by Scanlan (1997) for bridge flutter analysis. Turbulence effect is simulated by suitably modifying the span-wise coherence equation of the aeroelastic load. The incipient flutter threshold is found as a function of turbulence properties. Various configurations are studied, i.e., pivot position, aspect ratio, turbulence coherence decay parameter and structural damping. The objective is to perform a thorough sensitivity analysis as the necessary premise for the planned, future examination of post-critical instability and operational efficiency of the harvester by suitable modeling and wind tunnel tests.

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紊流和扑动轴对扭颤振收割机效率的影响用封闭公式表示

这个“短通信”研究了一个扭转-颤振能量收集器在大气风与静止湍流中的动力学。该装置是颤振磨的一个例子，它利用气动弹性不稳定性作为一种有竞争力的替代方案，并作为一个或几个住房单元的可再生能源供应。该装置有一个刚性的叶片翼型，围绕枢轴旋转以产生扑翼运动。与第二作者最近的研究相反，随机平稳湍流对颤振发作的影响通过Scanlan（1997）用于桥梁颤振分析的解析方法进行了检验。通过适当修改气动弹性载荷跨向相干方程来模拟湍流效应。发现初始颤振阈值是湍流特性的函数。研究了各种构型，即枢轴位置、展弦比、湍流相干衰减参数和结构阻尼。目标是进行彻底的敏感性分析，作为计划的必要前提，未来通过适当的建模和风洞试验来检查收割机的临界后不稳定性和运行效率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Wind Engineering and Industrial Aerodynamics 工程技术-工程：土木

CiteScore

8.90

自引率

22.90%

发文量

306

审稿时长

4.4 months

期刊介绍： The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.