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 Energy harvesting efficiency of piezoelectric flags in axial flows

2013 ◽  
Vol 714 ◽  
pp. 489-504 ◽  
Author(s):  
Sébastien Michelin ◽  
Olivier Doaré
Keyword(s):  
Energy Harvesting ◽  
Mode Selection ◽  
Axial Flow ◽  
Output Circuit ◽  
Solid Deformation ◽  
High Fluid ◽  
Piezoelectric Coupling ◽  
Harvesting Efficiency ◽  
Harvesting Process ◽  
Energy Harvesting Efficiency

AbstractSelf-sustained oscillations resulting from fluid–solid instabilities, such as the flutter of a flexible flag in axial flow, can be used to harvest energy if one is able to convert the solid energy into electricity. Here, this is achieved using piezoelectric patches attached to the surface of the flag, which convert the solid deformation into an electric current powering purely resistive output circuits. Nonlinear numerical simulations in the slender-body limit, based on an explicit description of the coupling between the fluid–solid and electric systems, are used to determine the harvesting efficiency of the system, namely the fraction of the flow kinetic energy flux effectively used to power the output circuit, and its evolution with the system’s parameters. The role of the tuning between the characteristic frequencies of the fluid–solid and electric systems is emphasized, as well as the critical impact of the piezoelectric coupling intensity. High fluid loading, classically associated with destabilization by damping, leads to greater energy harvesting, but with a weaker robustness to flow velocity fluctuations due to the sensitivity of the flapping mode selection. This suggests that a control of this mode selection by a careful design of the output circuit could provide some opportunities to improve the efficiency and robustness of the energy harvesting process.

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.

scholarly journals Wake-foil interactions and energy harvesting efficiency in tandem oscillating foils

2021 ◽  
Vol 6 (7) ◽  
Author(s):  
Bernardo Luiz R. Ribeiro ◽  
Yunxing Su ◽  
Quentin Guillaumin ◽  
Kenneth S. Breuer ◽  
Jennifer A. Franck
Keyword(s):  
Energy Harvesting ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency ◽  
Oscillating Foils

scholarly journals The effect of non-uniform damping on flutter in axial flow and energy-harvesting strategies

2012 ◽  
Vol 468 (2147) ◽  
pp. 3620-3635 ◽  
Author(s):  
Kiran Singh ◽  
Sébastien Michelin ◽  
Emmanuel De Langre
Keyword(s):  
Theoretical Model ◽  
Energy Harvesting ◽  
Axial Flow ◽  
Flexible Structure ◽  
Fluid Loading ◽  
Power Harvesting ◽  
Reduced Order ◽  
Slender Structure ◽  
Preliminary Study ◽  
System Energy

The problem of energy harvesting from flutter instabilities in flexible slender structures in axial flows is considered. In a recent study, we used a reduced-order theoretical model of such a system to demonstrate the feasibility for harvesting energy from these structures. Following this preliminary study, we now consider a continuous fluid-structure system. Energy harvesting is modelled as strain-based damping, and the slender structure under investigation lies in a moderate fluid loading range, for which the flexible structure may be destabilized by damping. The key goal of this work is to analyse the effect of damping distribution and intensity on the amount of energy harvested by the system. The numerical results indeed suggest that non-uniform damping distributions may significantly improve the power-harvesting capacity of the system. For low-damping levels, clustered dampers at the position of peak curvature are shown to be optimal. Conversely for higher damping, harvesters distributed over the whole structure are more effective.

scholarly journals Stoppers Energy Harvesting Efficiency Enhancement via Optimal Linear Controller

2016 ◽  
Author(s):  
Douglas Da Costa Ferreira ◽  
Fábio Roberto Chavarette ◽  
Jean-Marc Stephane Lafay ◽  
Paulo Rogerio Novak ◽  
Samuel Pagotto ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Efficiency Enhancement ◽  
Linear Controller ◽  
Optimal Linear ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency

Energy Harvesting Efficiency of III–V Multi-Junction Concentrator Solar Cells under Realistic Spectral Conditions

2010 ◽  
Author(s):  
S. P. Philipps ◽  
G. Peharz ◽  
R. Hoheisel ◽  
T. Hornung ◽  
N. M. Al-Abbadi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Harvesting ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency

scholarly journals Analytical research on energy harvesting systems for fluidic soft actuators

2018 ◽  
Vol 15 (1) ◽  
pp. 172988141875587 ◽  
Author(s):  
Tao Wang ◽  
Wei Song ◽  
Shiqiang Zhu
Keyword(s):  
Energy Harvesting ◽  
Dynamic Models ◽  
Original System ◽  
Control Performance ◽  
Harvesting Systems ◽  
Energy Harvesting System ◽  
Analytical Research ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency ◽  
Soft Actuators

Energy consumption has significant influence on the working time of soft robots in mobile applications. Fluidic soft actuators usually release pressurized fluid to environment in retraction motion, resulting in dissipation of considerable energy, especially when the actuators are operated frequently. This article mainly explores the potential and approaches of harvesting the energy released from the actuators. First, the strain energy and pressurized energy stored in fluidic soft actuators are modeled based on elastic mechanics. Then, taking soft fiber-reinforced bending actuators as case study, the stored energy is calculated and its parametric characteristics are presented. Finally, two energy harvesting schematics as well as dynamic models are proposed and evaluated using numerical analysis. The results show that the control performance of the energy harvesting system becomes worse because of increased damping effect and its energy harvesting efficiency is only 14.2% due to the losses of energy conversion. The energy harvesting system in pneumatic form is a little more complex. However, its control performance is close to the original system and its energy harvesting efficiency reaches about 44.1%.

Improving energy harvesting efficiency of dye sensitized solar cell by using cobalt-rGO co-doped TiO2 photoanode

2022 ◽  
Vol 891 ◽  
pp. 162040
Author(s):  
Ikhtiar Ahmad ◽  
Rashida Jafer ◽  
Syed Mustansar Abbas ◽  
Nisar Ahmad ◽  
Ata-ur-Rehman ◽  
...  
Keyword(s):  
Solar Cell ◽  
Energy Harvesting ◽  
Dye Sensitized Solar Cell ◽  
Doped Tio2 ◽  
Dye Sensitized ◽  
Harvesting Efficiency ◽  
Energy Harvesting Efficiency ◽  
Co Doped ◽  
Tio2 Photoanode
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