A Reconfigurable Ducted Turbine Array Concept for Renewable Flow Energy Harvesting

2022 ◽  
Author(s):  
Onur Bilgen ◽  
Roger Wang ◽  
Yue Cao ◽  
Nazim Erol ◽  
Xin Shan
Keyword(s):  
Energy Harvesting ◽  
Flow Energy ◽  
Ducted Turbine

Hybrid piezoelectric-inductive flow energy harvesting and dimensionless electroaeroelastic analysis for scaling

2013 ◽  
Vol 102 (4) ◽  
pp. 044101 ◽  
Author(s):  
J. A. C. Dias ◽  
C. De Marqui ◽  
A. Erturk
Keyword(s):  
Energy Harvesting ◽  
Flow Energy

An Underwater Magnetically Coupled Bistable Vibration Energy Harvester Using Wings

2019 ◽  
Author(s):  
Hong-Xiang Zou ◽  
Ke-Xiang Wei ◽  
Lin-Chuan Zhao ◽  
Wen-Ming Zhang ◽  
Lei Zuo ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Water Flow ◽  
Energy Harvester ◽  
High Reliability ◽  
Average Power ◽  
Vibration Energy ◽  
Coupling Mechanism ◽  
Vibration Energy Harvester ◽  
Water Flow Velocity ◽  
Flow Energy

Abstract Piezoelectric flow energy harvesting can be a potential way to yield endless electrical energy for small mechanical systems and wireless sensors. We propose a novel magnetically coupled bistable vibration energy harvester using wings for the applications in the water environment. The water flow energy can be harvested through the induced vibration of wings. The flextensional transducer can be packaged conveniently by using non-contact magnetic coupling mechanism. The magnetic force is amplified by the flextensional structure and transferred to the piezoelectric layer, thereby achieving higher power density and better reliability. A prototype was fabricated and tested in a water flume, which attended a maximum power of about 400 μW and the average power of 55 μW at the water flow velocity of 4 m/s. No significant variation occurred to the performance of the harvester after five days of continuous operation in the water, which indicates that the magnetically coupled vibration energy harvesting method has high reliability in the underwater environment.

Optimal frequency for flow energy harvesting of a flapping foil

2011 ◽  
Vol 675 ◽  
pp. 495-517 ◽  
Author(s):  
QIANG ZHU
Keyword(s):  
Energy Harvesting ◽  
Vortex Shedding ◽  
Leading Edge ◽  
Energy Extraction ◽  
Flapping Foil ◽  
Flow Energy ◽  
Performance Point ◽  
High Efficient ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency

Inspired by the correlation between the propulsion efficiency of a flapping foil propeller and stability of the wake behind it (which leads to the optimal Strouhal number for propulsion), we numerically simulated a heaving/pitching foil in energy harvesting regime, and investigated the relation between wake stability and the energy harvesting efficiency. The base flow is computed using a Navier–Stokes algorithm and the stability analysis is performed via the Orr–Sommerfeld equation. The wake is found to be convectively unstable and the frequency of the most unstable mode fw is determined. The case when fw ~ f coincides with maximum energy harvesting efficiency of the system (f is the frequency of foil oscillation), suggesting that flow energy extraction is closely related to efficient evolution of the wake. This occurs at a frequency of f ~ 0.15 (f is normalized by the chord length and the flow speed), under the constraint that there is significant vortex shedding from the leading edge at sufficiently large effective angles of attack. Indeed, this ‘foil–wake resonance’ is usually associated with multi-vortex shedding from the leading edge. Furthermore, detailed examination of energy extractions from the heaving and the pitching motions indicates that near the optimal performance point the average energy extraction from the pitching motion is close to zero. This suggests the feasibility of achieving high-efficient energy harvesting through a simple fully passive system we proposed earlier in which no activation is needed.

Optimal Leading Edge Vortex Formation of a Flapping Foil in Energy Harvesting Regime

2017 ◽  
Author(s):  
Firas F. Siala ◽  
Alexander D. Totpal ◽  
James A. Liburdy
Keyword(s):  
Energy Harvesting ◽  
Vortex Formation ◽  
Leading Edge ◽  
Flux Analysis ◽  
Leading Edge Vortex ◽  
Flapping Foil ◽  
Flow Energy ◽  
Edge Vortex ◽  
Formation Number ◽  
Harvesting Regime

An experimental investigation is conducted to study the leading edge vortex (LEV) evolution of a simultaneously heaving and pitching foil operating in the energy harvesting regime. Two dimensional particle image velocimetry measurements are collected in a wind tunnel at reduced frequencies of k = fc/U = 0.05–0.20. Vorticity flux analysis is performed to calculate the constant C in the vortex formation number equation proposed by J. O. Dabiri [1], and it is shown that for a flapping foil operating in the energy harvesting regime, this constant is approximately equal to 1.33. We demonstrate that the optimal LEV formation number (T̂max ≈ 4) is achieved at k = 0.11, which is well within the range of optimal reduced frequency for energy harvesting applications (k = 0.1–0.15). This suggests that the flow energy extraction is closely related to the efficient evolution process of the LEV.

scholarly journals Flow Energy Harvesting With Piezoelectric Flags

2014 ◽  
Author(s):  
Olivier Doaré ◽  
Sébastien Michelin ◽  
Miguel Pineirua ◽  
Yifan Xia
Keyword(s):  
Theoretical Model ◽  
Energy Harvesting ◽  
Parametric Study ◽  
Axial Flow ◽  
Continuous Model ◽  
Flow Energy ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency ◽  
Lock In ◽  
Good Agreement

In this article, energy harvesting with a fluttering cantilevered plate covered by piezoelectric patches in an axial flow is adressed. A theoretical model is presented which is then discretized and numerically integrated to perform a parametric study of the energy harvesting efficiency of the system. When one, two or three piezoelectric patches cover the plate, the optimal distributions of the patches that maximize the efficiency are obtained. Experimental results are presented, which are in good agreement with the model. When a significantly high number of patches of small size are considered, a continuous model is used to study the influence of a resonant harvesting circuit. A lock-in phenomenon is evidenced, which is able to significantly increase the efficiency.

scholarly journals Capturing Flow Energy from Ocean and Wind

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2184 ◽  
Author(s):  
Ying Gong ◽  
Zhengbao Yang ◽  
Xiaobiao Shan ◽  
Yubiao Sun ◽  
Tao Xie ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
State Of The Art ◽  
Working Environment ◽  
Superior Performance ◽  
Energy Harvesters ◽  
Flow Energy ◽  
Existing Problems ◽  
Piezoelectric Energy ◽  
Harvesting Techniques ◽  
Triboelectric Nanogenerators

Flow-induced energy harvesting has attracted more and more attention among researchers in both fields of the wind and the fluid. Piezoelectric energy harvesters and triboelectric nanogenerators are exploited to obtain superior performance and sustainability, and the electromagnetic conversion has been continuously improved in the meantime. Aiming at different circumstances, researchers have designed, manufactured, and tested a variety of energy harvesters. In this paper, we analyze the state-of-the-art energy harvesting techniques and categorize them based on the working environment, application targets, and energy conversion mechanisms. The trend of research endeavors is analyzed, and the advantages, existing problems of energy harvesters, and corresponding solutions of energy harvesters are assessed.

Flow-energy harvesting using a fully passive flapping foil: A guideline on design and operation

2021 ◽  
Vol 197 ◽  
pp. 106323
Author(s):  
Fuwang Zhao ◽  
M.N. Mumtaz Qadri ◽  
Zhaokun Wang ◽  
Hui Tang
Keyword(s):  
Energy Harvesting ◽  
Flapping Foil ◽  
Flow Energy
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