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22 March 2021 Evaluation of aerodynamic coupling in side-by-side piezoelectric beams in quiescent and grid-generated turbulent flow
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Abstract
Non-resonant harvesters such as piezoelectric cantilever beams that extract energy from turbulence-induced vibration are often nonviable alternatives to their resonant counterparts. In the quest for enhanced viability, such fluidic harvesters can be positioned side-by-side and incorporate the aerodynamic coupling between them to improve power output. In this paper, we derive the power budget and electromechanical efficiency of two side-by- side beams subjected to an impact load in quiescent flow and grid-generated turbulence. We also introduce the aerodynamic coupling-to-input ratio and aerodynamic coupling effectiveness as ways to measure the influence of the aerodynamic coupling on the energy conversion process. The theoretical derivations are used to evaluate the aforementioned terms for two cases: (i) one beam subjected to a ringdown test in quiescent flow and (ii) both beams exposed to grid-generated turbulence. The influence of gap-to-width ratio, mean flow velocity and distance from the grid on each term has also been considered in this analysis. Our results show that while the aerodynamic coupling-to-input ratio exponentially decays with respect to the gap-to-width ratio for the ringdown test case, it remains relatively constant and non-zero with increasing gap-to-width ratio for the turbulence cases considered.
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© (2021) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Zhicheng Kai and Amir H. Danesh-Yazdi "Evaluation of aerodynamic coupling in side-by-side piezoelectric beams in quiescent and grid-generated turbulent flow", Proc. SPIE 11588, Active and Passive Smart Structures and Integrated Systems XV, 1158817 (22 March 2021); https://doi.org/10.1117/12.2582699
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