Design and Analysis of A Vortex Induced Vibration Based Oscillating Free Stream Energy Converter
Keywords:Vortex Induced Vibration, Oscillating Energy Converter, Free Stream Energy
The Kármán Vortex Shedding is one of the special types of vortex that is generated from asymmetric flow separation. For many years engineers tried to suppress the vortex shedding as it brings unnecessary motion to the static members inside the flow field. A converter model is designed and studied to harness the energy associated with this vortex shedding and convert it into usable form rather than suppressing it. It is a bluff body placed on the free stream incurring vortex-induced vibration and giving out a swinging pendulum motion. This motion is utilized to produce electricity. The model is analyzed on the free stream of water and conversion efficiency of 8.9% is achieved. A theoretical formula is derived regarding the force acting on the bluff body during the motion. Various parameters such as aspect ratio, flow velocity, lock-in delay, frequency of oscillation, etc. as well as their relations are studied by simulating the model in ANSYS FLUENT 18.1 for different configurations. From the simulated results it is obvious that as the lift force on the bluff body increases, more power generation is possible. Also, the experimental results paved the way for further study for practical large-scale implementation of the converter.
Pritchard, J.L., 1954. Aerodynamics. Selected topics in the light of their historical development. Theodore von Kármán. Cornell University Press, Ithaca, New York. Oxford University Press, Oxford, 1954. 194 pp. illustrated. 38s. The Aeronautical Journal, 58(528), pp.841-842. DOI: https://doi.org/10.1017/S0368393100102202
Bernitsas, M.M., Raghavan, K., Ben-Simon, Y. and Garcia, E.M.H., 2008. VIVACE (Vortex Induced Vibration Aquatic Clean Energy): A new concept in generation of clean and renewable energy from fluid flow. Journal of offshore mechanics and Arctic engineering, 130(4). DOI: https://doi.org/10.1115/1.2957913
Modi, P.N. and Seth, S.M., 2019. Hydraulics and Fluid Mechanics Including Hydraulics Machines. Rajsons Publications Pvt. Ltd..
Dorman, T.E., Welna, H. and Lindlauf, R.W., 1968. The application of controlled-vortex aerodynamics to advanced axial flow turbines. Journal of Engineering for Gas Turbines and Power, 90(3) pp.245-250. DOI: https://doi.org/10.1115/1.3609182
Edwards, S.S., Edwards Samuel S, 1985. Wind energy converter utilizing vortex augmentation. U.S. Patent 4,516,907.
Patterson Jr, J.C. and Flechner, S.G., 1985. Exploratory wind-tunnel investigation of a wingtip-mounted vortex turbine for vortex energy recovery. NASA Technical Paper 2468.
Patterson Jr, J.C., National Aeronautics and Space Administration (NASA), 1990. Wingtip vortex turbine. U.S. Patent 4,917,332.
Jensen, D.C., Jensen Donald C, 1994. Energy converter using imploding plasma vortex heating. U.S. Patent 5,359,966.
Carney, M.E., 2008. Energy capture in flowing fluids. U.S. Patent Application 11/509,667.
Cajas, J.C., Houzeauxa, G., Yáñezb, D.J., Mier-Torrecillaa, M., 2016. SHAPE Project Vortex Bladeless: Parallel multi-code coupling for Fluid-Structure Interaction in Wind Energy Generation. Available online at www.prace-ri.eu.
Bernitsas, M.M. and Raghavan, K., 2004. Converter of current/tide/wave energy. Provisional Patent Application. United States Patent and Trademark Office Serial, (60/628,252).
Govardhan, R.N., 2000. Vortex-induced vibration of two and three-dimensional bodies. Cornell University.
- Abstract view