Interaction of side-by-side fluidic harvesters in fractal grid-generated turbulence

While the vast majority of the literature in energy harvesting is dedicated to resonant harvesters, non-resonant harvesters, especially those that use turbulence-induced vibration to generate energy, have not been studied in as much detail. This is especially true for grid-generated turbulence. In this paper, the interaction of two side-by-side fluidic harvesters from a passive fractal grid-generated turbulent flow is considered. The fractal grid has been shown to significantly increase the turbulence generated in the flow which is the source of the vibration of the piezoelectric beams. In this experimental study, the influence of four parameters has been investigated: Beam lengths and configurations, mean flow velocity, distance from the grid and gap between the two beams. Experimental results show that the piezoelectric harvesters in fractal grid turbulence are capable of producing at least the same amount of power as those placed in passive rectangular grids with a larger pressure loss, allowing for a potentially significant increase in the efficiency of the energy conversion process, even though more experiments are required to study the behavior of the beams in homogeneous, fractal grid-generated turbulence.

[1]  Yiannis Andreopoulos,et al.  The Effects of Turbulence Length Scale on the Performance of Piezoelectric Harvesters , 2015, HRI 2015.

[2]  D. Markley,et al.  Energy Harvesting Using a Piezoelectric “Cymbal” Transducer in Dynamic Environment , 2004 .

[3]  Maurizio Porfiri,et al.  Hydrodynamic coupling of two sharp-edged beams vibrating in a viscous fluid , 2014, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[4]  Paul K. Wright,et al.  A piezoelectric vibration based generator for wireless electronics , 2004 .

[5]  Daniel J. Inman,et al.  Powering pacemakers from heartbeat vibrations using linear and nonlinear energy harvesters , 2012 .

[6]  Y. Andreopoulos,et al.  Fluidic energy harvesting beams in grid turbulence , 2015 .

[7]  Daniel J. Inman,et al.  On the energy harvesting potential of piezoaeroelastic systems , 2010 .

[8]  R. J. Hearst,et al.  Decay of turbulence generated by a square-fractal-element grid , 2014, Journal of Fluid Mechanics.

[9]  Alper Erturk,et al.  Piezoelectric energy harvesting for civil infrastructure system applications: Moving loads and surface strain fluctuations , 2011 .

[10]  Maurizio Porfiri,et al.  Energy exchange between a vortex ring and an ionic polymer metal composite , 2012 .

[11]  N. Elvin,et al.  Interaction of side-by-side piezoelectric beams in quiescent flow and grid turbulence , 2017 .

[12]  N. Elvin,et al.  Energy Harvesting from Highly Unsteady Fluid Flows using Piezoelectric Materials , 2010 .

[13]  A. A. Elvin,et al.  Vibrational Energy Harvesting From Human Gait , 2013, IEEE/ASME Transactions on Mechatronics.

[14]  Jan M. Rabaey,et al.  A study of low level vibrations as a power source for wireless sensor nodes , 2003, Comput. Commun..

[15]  John Christos Vassilicos,et al.  Scalings and decay of fractal-generated turbulence , 2007 .

[16]  Matthew Bryant,et al.  Modeling and Testing of a Novel Aeroelastic Flutter Energy Harvester , 2011 .

[17]  Y. Andreopoulos,et al.  Wake of a cylinder: a paradigm for energy harvesting with piezoelectric materials , 2010 .

[18]  Daniel J. Inman,et al.  Artificial piezoelectric grass for energy harvesting from turbulence-induced vibration , 2012 .

[19]  Daniel J. Inman,et al.  Piezoelectric energy harvesting from broadband random vibrations , 2009 .

[20]  A. Barrero-Gil,et al.  Energy harvesting from transverse galloping , 2010 .

[21]  Yiannis Andreopoulos,et al.  Energy harvesting prospects in turbulent boundary layers by using piezoelectric transduction , 2015 .

[22]  Yiannis Andreopoulos,et al.  Parametric analysis of fluidic energy harvesters in grid turbulence , 2016 .

[23]  Joseph R. Burns,et al.  The Energy Harvesting Eel: a small subsurface ocean/river power generator , 2001 .

[24]  M. Tutelaers,et al.  Large power amplification of a piezoelectric energy harvester excited by random vibrations , 2013, 2013 IEEE 26th International Conference on Micro Electro Mechanical Systems (MEMS).