An Experimental Study of Downstream Structures on the Flow-Induced Vibrations Energy Harvester Performances
This paper presents an experimental investigation for the characteristics of an energy harvesting device exploiting flow-induced vibration in a wind tunnel. A stationary bluff body is connected with a downstream tip body via an aluminium cantilever beam. Various lengths of aluminium cantilever beam and different shapes of downstream tip body are considered. The results show that the characteristics of the energy harvester’s vibration depend on both the length of the aluminium cantilever beam and the shape of the downstream tip body. The highest ratio between vibration amplitude and bluff body diameter was found to be 1.39 for an energy harvester with a symmetrical triangular tip body and L/D1 = 5 at 9.8 m/s of flow speed (Re = 20077). Using this configuration, the electrical energy was extracted with a polyvinylidene fluoride (PVDF) piezoelectric beam with different load resistances, of which the optimal value could be found on each Reynolds number. The highest power output was found to be 3.19 µW, at 9.8 m/s of flow speed (Re = 20077) and 27 MΩ of load resistance.
 B. C. Norman, "Power Options for Wireless Sensor Networks," Proc. Proceedings 40th Annual 2006 International Carnahan Conference on Security Technology, 2006,.pp. 17-20.
 A. Abdelkefi, A. Alothman, and M. R. Hajj, "Performance analysis and validation of thermoelectric energy harvesters," Smart Materials and Structures, vol. 22, no. 9, p. 095014, 2013.
 I. L.Cassidy, J. T. Scruggs, and S. Behrens, "Design of electromagnetic energy harvesters for large-scale structural vibration applications," Proc. SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, SPIE, 2011, p. 11.
 M. Bryant, and E. Garcia, "Modeling and testing of a novel aeroelastic flutter energy harvester," Journal of Vibration and Acoustics, vol. 133, no. 1, pp. 011010-011010-011011, 2011.
 L. A. Weinstein, M. R. Cacan, P. M. So, and P. K. Wright, "Vortex shedding induced energy harvesting from piezoelectric materials in heating, ventilation and air conditioning flows," Smart Materials and Structures, vol. 21 no. 4, p. 045003, 2012.
 J. M. McCarthy, A. Deivasigamani, S. J. John, S. Watkins, F Coman, and P. Petersen, "Downstream flow structures of a fluttering piezoelectric energy harvester," Experimental Thermal and Fluid Science, vol. 51, pp. 279-290, 2013.
 J. J. Allen, and A. J. Smits, "Energy Harvesting Eel," Journal of Fluids and Structures, vol. 15, no. 3, pp. 629-640, 2001.
 S. Mittal, and V. Kumar, "Vortex induced vibrations of a pair of cylinders at Reynolds number 1000," International Journal of Computational Fluid Dynamics, vol. 18, no. 7, pp. 601-614, 2004.
 J. Mizushima, and N. Suehiro, "Instability and transition of flow past two tandem circular cylinders," Physics of Fluids, vol. 17, no. 10, p. 104107, 2005.
 W. B. Hobbs, and D. L. Hu, "Tree-inspired piezoelectric energy harvesting," Journal of Fluids and Structures, vol. 28, pp. 103-114, 2012
 A. Abdelkefi, J. M. Scanlon, E. McDowell, and M. R. Hajj, "Performance enhancement of piezoelectric energy harvesters from wake galloping," Applied Physics Letters, vol. 103, no. 3, p. 033903, 2013.
 D. Guyomar, A. Badel, E. Lefeuvre, and C. Richard, "Toward energy harvesting using active materials and conversion improvement by nonlinear processing," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 52, no. 4, pp. 584-595, 2005.
 E. Naudascher, and D. Rockwell, "Oscillator-Model Approach To Theidentification And Assessment Offlow-Induced Vibrations In A System," Journal of Hydraulic Research, vol. 18 no. 1, pp. 59-82, 1980.