Energy Harvesting Eel

Allen, James J.; Smits, Alexander J.

doi:10.1006/jfls.2000.0355

Cited by 486 publications

(296 citation statements)

References 7 publications

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“…The energy harvesting eel uses a PVDF membrane located in the vortex wake of a body located in a fluid stream to generate electricity. The vortices in the wake deform the PVDF membrane which is up to 0.7 mm thick and 0.457 m long [80]. This application is obviously limited to large scale fluidic applications and may find uses in powering ocean sensor buoys.…”

Section: Other Piezoelectric Generatorsmentioning

confidence: 99%

Energy harvesting vibration sources for microsystems applications

Beeby

Tudor

White

2006

Meas. Sci. Technol.

2,603

1,468

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This paper reviews the state-of-the art in vibration energy harvesting for wireless, self-powered microsystems. Vibration-powered generators are typically, although not exclusively, inertial spring and mass systems. The characteristic equations for inertial-based generators are presented, along with the specific damping equations that relate to the three main transduction mechanisms employed to extract energy from the system. These transduction mechanisms are: piezoelectric, electromagnetic and electrostatic. Piezoelectric generators employ active materials that generate a charge when mechanically stressed. A comprehensive review of existing piezoelectric generators is presented, including impact coupled, resonant and human-based devices. Electromagnetic generators employ electromagnetic induction arising from the relative motion between a magnetic flux gradient and a conductor. Electromagnetic generators presented in the literature are reviewed including large scale discrete devices and wafer-scale integrated versions. Electrostatic generators utilize the relative movement between electrically isolated charged capacitor plates to generate energy. The work done against the electrostatic force between the plates provides the harvested energy. Electrostatic-based generators are reviewed under the classifications of in-plane overlap varying, in-plane gap closing and out-of-plane gap closing; the Coulomb force parametric generator and electret-based generators are also covered. The coupling factor of each transduction mechanism is discussed and all the devices presented in the literature are summarized in tables classified by transduction type; conclusions are drawn as to the suitability of the various techniques.

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Section: Other Piezoelectric Generatorsmentioning

confidence: 99%

Energy harvesting vibration sources for microsystems applications

Beeby

Tudor

White

2006

Meas. Sci. Technol.

2,603

1,468

View full text Add to dashboard Cite

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“…The present interest in the use of flexible splitter plates has been mainly motivated for its potential use as an energy harvesting device. Taylor et al [17] and Allen and Smits [1] examined the potential use of a flexible splitter plate, which is made of a piezoelectric membrane, attached to a bluff body for generation of electricity from vortex-sheddinginduced vibration of the plate. Flexible membranes have been considered recently by Mazellier et al [11] to control the wake generated behind a square cylinder.…”

Section: Introductionmentioning

confidence: 99%

The PELskin project: part IV—control of bluff body wakes using hairy filaments

et al. 2016

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The passive control of bluff body wakes using a sparse layer of elastic hairy filaments has been investigated via a series of numerical simulations and compared to selected experiments under well-controlled boundary conditions. It has been found that a distribution of filaments spaced half of the dominant three dimensional instability and resonating with the main shedding frequency can drastically delay the three dimensional transition of the wake behind a circular cylinder. It will also be shown that when using a pair of rows of filaments symmetrically spaced by an azimuthal angle, the wake topology can be deeply affected as well as the value of the integral force coefficients of the cylinder. In the most favourable case, a coupled three dimensional transition delay and strongly reduced values of the drag and of the lift fluctuation can be simultaneously achieved. These results hold also for higher Reynolds-number flows as shown in experiments on a cylinder with hairy flaps attached to the aft part. The lock-in effect of structural vibration of the flaps with the vortex shedding is assumed to be the reason for a sudden change in the shedding cycle as soon as the motion amplitude is high enough to modify the wake. In line with this hypothesis, it has been demonstrated that a long elastic filament pinned on the centerline of a forced spatially developing mixing layer can interact with the vortex dynamics delaying the pairing process-leading to a reduced thickness of the layer. These findings show that a properly designed fluid structure interaction can indeed lead to technological benefits in terms of wake control: drag reduction, vibration control and possibly palliation of aeroacoustic emissions.

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“…To maximize the amount of power generated by the eel, many factors have been considered in the investigation, such as the thickness and stiffness of the eel materials, the eel length, the bluff body width and the spacing between the body and eel head [3][4]. The feasibility and performance of harvesting the electrical charge by a resistive circuit was recently studied, and it was shown that both the stability of the system and the fluttering dynamics are influenced by electrical coupling [5][6]. The energy harvesting eel is a device that uses piezoelectric polymer to convert energy from fluid flow into electricity power, which can harvest energy in both ocean and river.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Piezoelectric Energy Harvester Based on the Vortex Flow

Wang

Cui

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this article, numerical research on the fluid-structure interaction between the flexible piezoelectric energy harvester (FPEH) and the Von Karman vortex street forming behind a bluff body is carried out to optimize the oscillation of FPEH to obtain more electrical energy. Using ANSYS Workbench platform, the simulation is performed. The numerical results show that the maximal deformation of the PEH is 1.7428 mm, meanwhile the maximal voltage is 4.6144 V. Besides, these numerical results generated by the ANSYS simulation are in good agreement with the experimental results. IntroductionWith the increasing consumption of fossil energy in the industrial production, the energy crisis has been placed in front of the world. In recent years, people have developed a variety of renewable energy to replace the traditional fossil energy, such as solar energy, wind energy, wave energy and so on. Among them, ocean wave energy has been focused more attention because of its huge energy reserves and environmental pollution-free features. Piezoelectric materials are well known for their ability to generate electrical charge when they are deformed. With this feature, piezoelectric flags have been placed in the fluid flow using as interested candidates [1][2]. Periodic deformation of the piezoelectric flags leads a periodic charge transfer between the electrodes of piezoelectric patches positioned on the surface of the piezoelectric flags as they exhibit spontaneous self-sustained flapping when the surrounding flow exceed a critical velocity. There are several literatures about the response of flexible piezoelectric energy harvester (FPEH) placed in a cross-flow and obtained the maximal strain energy and output power. To maximize the amount of power generated by the eel, many factors have been considered in the investigation, such as the thickness and stiffness of the eel materials, the eel length, the bluff body width and the spacing between the body and eel head [3][4]. The feasibility and performance of harvesting the electrical charge by a resistive circuit was recently studied, and it was shown that both the stability of the system and the fluttering dynamics are influenced by electrical coupling [5][6]. The energy harvesting eel is a device that uses piezoelectric polymer to convert energy from fluid flow into electricity power, which can harvest energy in both ocean and river. In this research, interaction between FPEH and the vortex behind a bluff body is studied.

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Energy Harvesting Eel

Cited by 486 publications

References 7 publications

Energy harvesting vibration sources for microsystems applications

Energy harvesting vibration sources for microsystems applications

The PELskin project: part IV—control of bluff body wakes using hairy filaments

Simulation of Piezoelectric Energy Harvester Based on the Vortex Flow

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