Comprehensive experimental study on bluff body shapes for vortex-induced vibration piezoelectric energy harvesting mechanisms

Mehdipour, Iman; Madaro, Francesco; Rizzi, Francesco; Vittorio, Massimo De

doi:10.1016/j.ecmx.2021.100174

Cited by 11 publications

(11 citation statements)

References 28 publications

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“…Experimental Setup: The test chamber of the wind tunnel was carefully configured to ensure laminar flow and repeatability for any given configuration, achieved through the implementation of a specific wind flow function. [2] The experimental setup involves utilizing a variety of proposed bluff body shapes in combination with various flag configurations.…”

Section: Methodsmentioning

confidence: 99%

“…The efficiency and effectiveness of the energy conversion is determined by a combination of factors including bluff body-induced drag and lift coefficients, vorticity pattern, flag configuration, and the fluid flow regime. [2] Crosswind responses may occur starting from the vortex lock-in speed, and the resulting self-excited vibrations exhibit different phenomenological regimes, depending on their specific characteristics. These regimes are known as the vortex-induced vibration (VIV), galloping, and the combined VIV-galloping.…”

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confidence: 99%

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An Autoencoder‐Based Deep‐Learning Method for Augmenting the Sensing Capability of Piezoelectric Microelectromechanical System Sensors in a Fluid‐Dynamic System

Kazemzadeh,

Mehdipour,

De Vittorio

et al. 2023

Advanced Intelligent Systems

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Herein, an innovative deep‐learning architecture is proposed to enhance the sensing capabilities of a microelectromechanical system (MEMS) used in fluid dynamic applications. The MEMS sensor comprises a polyvinylidene fluoride flexible (PVDF) piezoelectric flag and a bluff body, with vortex generation influenced not only by the bluff body's geometry but also by the input fluid speed. As a result, mechanical vibrations are induced in the piezoelectric flag, leading to charge displacement and the generation of electrical voltage signals. Through the developed deep learning method, accurate extraction of wind speed and successful classification of turbulence are achieved. Experimental tests in a wind tunnel, involving various wind speeds and bluff body geometries, demonstrate the robust correlation between the extracted continuous manifold in Fourier spectra and wind speed. By incorporating a feed‐forward network alongside the autoencoder, wind speed information even under strong turbulence is extracted. Moreover, the deep learning method's ability to classify different bluff bodies, independent of wind speed, is investigated. The findings reveal a unique capability to fingerprint turbulence and distinguish them for various applications. This research showcases the potential of our deep learning‐based MEMS systems for enhancing fluid dynamic sensing and classification tasks.

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Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

An Autoencoder‐Based Deep‐Learning Method for Augmenting the Sensing Capability of Piezoelectric Microelectromechanical System Sensors in a Fluid‐Dynamic System

Kazemzadeh,

Mehdipour,

De Vittorio

et al. 2023

Advanced Intelligent Systems

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show abstract

“…Junlei Wang et al [ 11 ] proposed a bluff body with different interfaces that can couple VIV and gallop to improve energy harvesting performance. Iman Mehdipour et al [ 12 ] conducted a comprehensive experimental study on the shape of a blunt body causing VIV and enhance the performance of low-speed wind energy harvester. Toma et al [ 13 ] proposed a vertical moving cylinder piezoelectric energy harvesting device.…”

Section: Introductionmentioning

confidence: 99%

Solid-Liquid Triboelectric Nanogenerator Based on Vortex-Induced Resonance

Zhang

et al. 2023

Nanomaterials

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Energy converters based on vortex-induced vibrations (VIV) have shown great potential for harvesting energy from low-velocity flows, which constitute a significant portion of ocean energy. However, solid-solid triboelectric nanogenerators (TENG) are not wear-resistant in corrosive environments. Therefore, to effectively harvest ocean energy over the long term, a novel solid-liquid triboelectric nanogenerator based on vortex-induced resonance (VIV-SL-TENG) is presented. The energy is harvested through the resonance between VIV of a cylinder and the relative motions of solid-liquid friction pairs inside the cylinder. The factors that affect the output performance of the system, including the liquid mass ratio and the deflection angle of the friction plates, are studied and optimized by establishing mathematical models and conducting computational fluid dynamics simulations. Furthermore, an experimental platform for the VIV-SL-TENG system is constructed to test and validate the performance of the harvester under different conditions. The experiments demonstrate that the energy harvester can successfully convert VIV energy into electrical energy and reach maximum output voltage in the resonance state. As a new type of energy harvester, the presented design shows a promising potential in the field of ‘blue energy’ harvesting.

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“…The objective of this study is to investigate the effects of multiple bluff bodies [6], specifically triangle and cylindrical shapes, arranged in a tandem configuration, on the efficiency of wind turbines. While previous studies have examined the impact of a single bluff body [7,8], the influence of multiple bluff bodies in a tandem arrangement remains unexplored.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of dual cylinders and triangle bluff bodies for piezoelectric energy harvesting

Kazim,

Zhe,

Harun

et al. 2023

J. Phys.: Conf. Ser.

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The flow patterns behind tandem bluff bodies can be used to generate electricity in piezoelectric energy harvesters. The vortices and wakes that form behind the bluff bodies create a pressure differential, which can be used to deform a piezoelectric film. In this study, we investigated the performance of dual triangle and dual cylinder bluff bodies in tandem at varying Reynolds numbers, Re, and spacing ratios, D. We compared the flow patterns behind the two types of bluff bodies. Sixteen hot wire anemometers were placed at different locations to measure the velocity developed behind the dual bluff bodies in tandem. The results showed that the velocities behind the cylinder bluff bodies were initially higher than those behind the triangle bluff bodies at lower Re. This is because the cylinder bluff bodies create a more turbulent flow, which results in higher velocities at lower Re. The best distance between the two bluff bodies was 3D and 5D, where the output velocities were maximized at more than 12ms−1. However, for dual triangle, the velocities eventually became higher than those behind the cylinder bluff bodies at higher Re and lower separation ratios (1D and 2D). 3D was the best distance for triangle to produce a higher velocity pattern, and this was best observed when Re = 10k, which is the lowest inlet velocity set. The results of the experiments are expected to show that the dual triangle bluff bodies produce higher velocities than the dual triangle bluff bodies, which will lead to a higher amount of energy being harvested. The results show that the amount of energy harvested were increase with increasing Re and decreasing D. The information enhancement can be done with turbulence analysis which could lead to the development of more efficient and versatile piezoelectric energy harvester.

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Comprehensive experimental study on bluff body shapes for vortex-induced vibration piezoelectric energy harvesting mechanisms

Cited by 11 publications

References 28 publications

An Autoencoder‐Based Deep‐Learning Method for Augmenting the Sensing Capability of Piezoelectric Microelectromechanical System Sensors in a Fluid‐Dynamic System

An Autoencoder‐Based Deep‐Learning Method for Augmenting the Sensing Capability of Piezoelectric Microelectromechanical System Sensors in a Fluid‐Dynamic System

Solid-Liquid Triboelectric Nanogenerator Based on Vortex-Induced Resonance

A comparative study of dual cylinders and triangle bluff bodies for piezoelectric energy harvesting

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