Hydrodynamic features of three equally spaced, long flexible cylinders undergoing flow-induced vibration

Ma, Yanfei; Luan, Yingsen; Xu, Wanhai

doi:10.1016/j.euromechflu.2019.09.021

Cited by 44 publications

(9 citation statements)

References 44 publications

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“…Harvesting energy from ubiquitous wind [1][2][3] has been extensively studied for the purpose to power micro-electro-mechanical systems (MEMS) [4][5][6][7][8][9][10][11] in the past decade. The development of wind energy harvesters requires to convert wind energy into structural vibration energy first using various flow-induced vibration mechanisms, [12][13][14][15] such as galloping, [16][17][18] wake galloping, 19,20 flutter 21 and vortex-induced vibration. [22][23][24][25] To subsequently convert vibration energy into electricity, there are several energy transduction methods including electromagnetic, [26][27][28][29] electrostatic 30,31 and piezoelectric effects.…”

Section: Introductionmentioning

confidence: 99%

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Wang

Huang

et al. 2020

Int J Energy Res

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Summary The cut‐in wind speed and the power output are the two main concerns of a galloping energy harvester. A good galloping energy harvester is expected to have a low cut‐in wind speed and a high power output. This paper proposes a two‐degree‐of‐freedom (2‐DOF) galloping‐based piezoelectric energy harvester (GPEH) by mounting a secondary beam onto a primary piezoelectric cantilever beam. An experimental study is conducted to evaluate the actual energy harvesting performance of the proposed 2‐DOF GPEH. The effects of the secondary beam length and the mounting position on the cut‐in wind speed and the power output are investigated. It is revealed that the introduction of the secondary beam can reduce the cut‐in wind speed from 2.372 m/s to 1.961 m/s. Mounting the secondary beam further away from the bluff body weakens the influence of the secondary beam on the energy harvesting performance of the 2‐DOF GPEH. Moreover, the power output can be increased or decreased by tuning the secondary beam length. The power output from a well‐tuned 2‐DOF GPEH can be increased for about 111.1%, as compared to the conventional 1‐DOF GPEH. By contrast, the power output from a badly tuned 2‐DOF GPEH is reduced for about 22.2%. A simple theoretical model is developed for explaining the experimentally observed phenomenon and can be used to provide some guidelines in the design of 2‐DOF GPEH to avoid performance deterioration.

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Section: Introductionmentioning

confidence: 99%

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Wang

Huang

et al. 2020

Int J Energy Res

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“…1 The advantage of energy harvesting lies in its sustainability and beneficial avoidance of battery replacement. 2,3 Harvesting environmental vibrations can be generally divided into two categories, that is, the preexisting base excitations resulting from the motion of machinery, structures, or human movements 4,5 and the flow-induced vibrations due to aeroelastic instabilities, such as vortexinduced vibration (VIV), 6 galloping, 7,8 flutter, 9,10 and buffeting, 11 or their synergetic effect. 12,13 Wind energy is a steady and pervasive power source in the environment.…”

Section: Discussionmentioning

confidence: 99%

“…When the wind passes over the bluff body, Von Kármán vortices are generated, resulting in unbalanced forces on the bluff body. In one or more narrow ranges of wind speed, resonance occurs when the vortex shedding frequency is close to the natural frequency of the system, and large‐amplitude cross‐flow vibrations are induced since the supporting spring allows plunging motions. When the resonance happens, the vibration frequency is locked at the natural frequency in a specific range of wind speed, which is called the “lock‐in” region.…”

Section: Mechanism Of Vivmentioning

confidence: 99%

Equivalent circuit representation of a vortex‐induced vibration‐based energy harvester using a semi‐empirical lumped parameter approach

et al. 2020

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Summary Small‐scale wind energy harvesting from vortex‐induced vibrations (VIV) has been introduced in recent years as a renewable power source for microelectronics and wireless sensors. Previous studies have focused on modeling and optimizing the VIV‐based piezoelectric energy harvester (VIVPEH) structures and simplified the complicated interface circuits as pure resistors with an alternating current (AC) output. In practice, an AC output is required to be transformed into a direct current (DC) followed by further regulations before being used for real applications. Incorporating the rectification and regulation, traditional theoretical and numerical models will become extremely cumbersome and even impossible. To address this issue, this work proposes an equivalent circuit model (ECM) for a typical VIVPEH. The Scanlan‐Ehsan aerodynamic force model is employed to describe the fluid‐structure interaction. Wind tunnel experiments are carried out to validate the derived model. The performances of the VIVPEH with AC and DC interface circuits are subsequently analyzed and compared to understand the influences of these circuits on the operational wind speed bandwidth, power output, vibration amplitude, and electrical damping.

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“…34 Second, there is a certain lock-in range that can be classified into several different evolution stages. 35,36 The energy harvesters in the above literatures are composed of bluff bodies and piezo-beams, and the adverse effects of splitter plate 37 will inevitably occur due to the connection of the piezo-beam, resulting in the decline of the vibration intensity. Although the piezo-beam width is smaller than the cylinder length, there is a relative motion between the piezo-beam and the surrounding fluid field during transverse vibration.…”

Section: Introductionmentioning

confidence: 99%

“…First, an optimal velocity exists in achieving the maximum vibration amplitude and power output efficiency . Second, there is a certain lock‐in range that can be classified into several different evolution stages . The energy harvesters in the above literatures are composed of bluff bodies and piezo‐beams, and the adverse effects of splitter plate will inevitably occur due to the connection of the piezo‐beam, resulting in the decline of the vibration intensity.…”

Section: Introductionmentioning

confidence: 99%

Bluff body with built‐in piezoelectric cantilever for flow‐induced energy harvesting

Zhang

Wang

2020

Int J Energy Res

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Summary This paper investigates a flow‐induced vibration energy harvester comprising a piezoelectric beam (piezo‐beam) installed within a hollow circular cylinder. Under the flow excitation, the energy‐harvesting system including the cylinder and the piezo‐beam vibrates and generates electricity. A lumped parametric model incorporating the fluid‐structure interaction (FSI) is developed to evaluate the performance of the proposed energy harvester. Based on the theoretical analysis, several guidelines on the design and optimization of the proposed energy harvester are provided. Subsequently, a numerical model is used to simulate the FSI between the proposed system and the external flow field. Finally, a physical prototype is fabricated and an experiment is conducted to test the actual performance for validation. The theoretical analysis results are verified by the numerical and experimental results.

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Hydrodynamic features of three equally spaced, long flexible cylinders undergoing flow-induced vibration

Cited by 44 publications

References 44 publications

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

An experimental study of a two‐degree‐of‐freedom galloping energy harvester

Equivalent circuit representation of a vortex‐induced vibration‐based energy harvester using a semi‐empirical lumped parameter approach

Bluff body with built‐in piezoelectric cantilever for flow‐induced energy harvesting

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