Abstract
Fluid flow has the potential to provide significant mechanical energy input for piezoelectric harvesters. However, the efficient conversion of the bulk kinetic energy of a steady and uniform flow into time-dependent elastic energy in the piezoelectric structure remains a significant challenge. In this chapter, a comparison of two harvesters is first presented and it is shown that improved aeroelastic coupling greatly increases the performance of flow-powered harvesters. A computational framework which couples the fluidic, structural, and electrical domains is introduced and is used to simulate the “aeroelectromechanical” performance of a piezoelectric energy harvester in the wake of a bluff body. The structural response of a flexible cantilever beam to a passing vortex ring and the estimation of its aeroelastic efficiency are also presented. Finally, we discuss the potential of turbulent boundary layers for energy harvesting from turbulent boundary layers.
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- 1.
Further experimental work is underway to determine whether the decrease in oscillation frequency is due to the motion of the cylinder or due to its finite length resulting in spiraling tip vortices emanating from both tips and directed towards the middle of the cylinder.
- 2.
Due to the construction and electrical connection of the harvester, the voltage outputs of the modes higher than the first bending mode were small and cannot be seen in Fig. 10.12. However, visual observation of the harvester and FFT analysis of the strain signal showed resonances in the first torsional mode and the second bending mode as detailed in [4].
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Akaydın, H.D., Elvin, N., Andreopoulos, Y. (2013). Flow-Induced Vibrations for Piezoelectric Energy Harvesting. In: Elvin, N., Erturk, A. (eds) Advances in Energy Harvesting Methods. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5705-3_10
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DOI: https://doi.org/10.1007/978-1-4614-5705-3_10
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