Piezoelectric energy harvesting from vortex-induced vibration of a circular cylinder: Effect of Reynolds number
Peer reviewed, Journal article
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This study investigates the effects of the Reynolds number on the piezoelectric energy harvesting from vortex-induced vibrations (VIV) of a circular cylinder. The VIV-based piezoelectric energy harvester is simulated by a representative electro-aero-mechanical model, in which the aerodynamic force is represented by a model with amplitude-dependent aerodynamic parameters and an aerodynamic damping envelope model. The amplitude-dependent aerodynamic parameters at two typical Reynolds numbers are identified based on free vibration experiments and forced vibration numerical simulations, respectively. The aerodynamic damping envelope over a Reynolds number range of 500–33000 are identified based on the Reynolds number-dependent Griffin plot. Wind tunnel experiments are carried out to verify the accuracy of the electro-aero-mechanical model for the VIV-based piezoelectric energy harvester. A parametric study is then performed to investigate the Reynolds number effects on the bifurcation diagrams and maximum power output of a VIV-based piezoelectric energy harvester. It is demonstrated that the Reynolds number affects not only the levels of the harvested power, but also the global branches of the bifurcation diagram. The results also show that the performance of a VIV-based piezoelectric energy harvester is more sensitive to the Reynolds number for a case with low mechanical damping ratio.