Wake of a cylinder: a paradigm for energy harvesting with piezoelectric materials
- 1.8k Downloads
Short-length piezoelectric beams were placed in the wake of a circular cylinder at high Reynolds numbers to evaluate their performance as energy generators. The coherent vortical structures present in this flow generate a periodic forcing on the beam which when tuned to its resonant frequency produces maximum output voltage. There are two mechanisms that contribute to the driving forcing of the beam. The first mechanism is the impingement of induced flow by the passing vortices on one side of the beam, and the second is the low pressure core region of the vortices which is present at the opposite side of the beam. The sequence of these two mechanisms combined with the resonating conditions of the beam generated maximum energy output which was also found to vary with the location in the wake. The maximum power output was measured when the tip of the beam is about two diameters downstream of the cylinder. This power drops off the center line of the wake and decays with downstream distance as (x/D)−3/2.
KeywordsVortex Shear Layer Circular Cylinder Piezoelectric Material Strouhal Number
The present work is sponsored by the Michael Pope Fund for Energy Research.
- Akaydin HD, Elvin N, Andreopoulos Y (2010) Energy harvesting from highly unsteady fluid flows using piezoelectric materials. J Intell Mater Struct (accepted for publication)Google Scholar
- Paradiso JA, Starner T (2005) Energy scavenging for mobile and wireless electronics. Pervasive Comput 4(1):18–27Google Scholar
- Pobering S, Schwesinger N (2004) A novel hydropower harvesting device. Proceedings—2004 International Conference on MEMS, NANO and Smart Systems, ICMENS 2004, pp 480–485Google Scholar
- Robbins WP, Marusic I, Morris D, Novak TO (2006) Wind-generated electrical energy using flexible piezoelectric materials. Proceedings of IMECE2006 2006 ASME International Mechanical Engineering Congress and Exposition, November 5–10, 2006, Chicago, IllinoisGoogle Scholar
- Roshko A (1954) On the development of turbulent wakes from vortex streets. NACA Report 1191Google Scholar
- Sahele M, Liu Y, Hoffman H (2005) Piezoelectric energy harvesting using different approaches including control system. Annu Res J III:134–141Google Scholar
- Schmidt VH (1992) Piezoelectric energy conversion in windmills. Proceedings of IEEE Ultrasonics Symposium, pp 897–904Google Scholar
- Shukla S, Govardhan RN, Arakeri JH (2009) Flow over a cylinder with a hinged-splitter plate. J Fluids Struct. ISSN 0889-9746, doi: 10.1016/j.jfluidstructs.2008.11.004