Hydrokinetic Energy Conversion by Flow-Induced Oscillation of Two Tandem Cylinders of Different Stiffness
- Marine Renewable Energy Laboratory, Department of Naval Architecture &, Marine Engineering, University of Michigan, 2600 Draper Dr., Ann Arbor, MI 48109,; Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China,; Key Lab of Structures Dynamic Behavior and Control of Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
- Marine Renewable Energy Laboratory, Department of Naval Architecture &, Marine Engineering, University of Michigan, 2600 Draper Dr., Ann Arbor, MI 48109,; College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China
- Department of Naval Architecture &, Ocean Engineering, Pusan National University, Busan 46241, South Korea
- Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of Ministry of Industry and Information Technology, Harbin Institute of Technology, Harbin 150090, China,; Key Lab of Structures Dynamic Behavior and Control of Ministry of Education, Harbin Institute of Technology, Harbin 150090, China
- School of Mechanical Engineering, National Technical University of Athens, Athens 15773, Greece
- Marine Renewable Energy Laboratory, Department of Naval Architecture &, Marine Engineering, University of Michigan, 2600 Draper Dr., Ann Arbor, MI 48109
Abstract The vortex-induced vibration for aquatic clean energy (VIVACE) converter harnesses hydrokinetic energy by enhancing flow-induced oscillations (FIOs) of elastically supported rigid cylinders in a river, tide, or ocean current. The harnessing power depends on the intensity of the oscillation, which is a consequence of the flow–structure interaction. The inflow condition for the downstream (second) cylinder is slowed down and perturbed by the upstream (first) cylinder, due to the shielding effect. Therefore, the optimal structural parameters, i.e., stiffness and damping ratio, for the second cylinder may be different from the first cylinder, in terms of energy harnessing. To improve the performance of the VIVACE converter, a series of experiments are conducted in a recirculating water channel, with various stiffness combinations of two cylinders in tandem. Results show that the stiffness of the second cylinder, K2, does not affect the energy harnessing power in vortex-induced vibration (VIV) occurring at low speeds, because the oscillation of the downstream cylinder in this velocity range is completely dominated by the wake of the upstream cylinder. K2 has a great influence on the harnessing power at higher velocities in the transition region from VIV to galloping and in galloping. Changing K2 onsets and enhances galloping at lower flow velocity and harnesses up to 110% more energy than the case of K1 = K2.
- Research Organization:
- Vortex Hydro Energy, Inc., Ann Arbor, MI (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- DOE Contract Number:
- EE0006780
- OSTI ID:
- 1980654
- Journal Information:
- Journal of Offshore Mechanics and Arctic Engineering, Vol. 143, Issue 6; ISSN 0892-7219
- Publisher:
- ASME
- Country of Publication:
- United States
- Language:
- English
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