Flow-induced vibration (FIV), primarily vortex-induced vibrations (VIV), and galloping have been used effectively to convert hydrokinetic energy to electricity in model-tests and field-tests by the Marine Renewable Energy Laboratory (MRELab) of the University of Michigan. It is known that the response of cylinders with passive turbulence control (PTC) undergoing vortex shedding differs from the oscillation of smooth cylinders in a similar configuration. Additional investigation on the FIV of two elastically mounted circular cylinders in a staggered arrangement with low mass ratio in the TrSL3 flow-regime is required and is contributed by this paper. The two PTC-cylinders were allowed to oscillate in the transverse direction to the oncoming fluid flow in a recirculating water channel. The cylinder model with a length of 0.895 m and a diameter of 8.89 cm, a mass ratio of 1.343 was used in the tests. The Reynolds number was in the range of 2.5 × 104 < Re < 1.2 × 105, which is a subset of the TrSL3 flow-regime. The center-to-center longitudinal and transverse spacing distances were T/D = 2.57 and S/D = 1.0, respectively. The spring stiffness values were in the range of 400 < K (N/m) <1200. The values of harnessing damping ratio tested were ζharness = 0.04, 0.12 and 0.24. For the values tested, the experimental results indicate that the response of the upstream cylinder is similar to the single cylinder. The downstream cylinder exhibits more complicated vibrations. In addition, the oscillation system of two cylinders with stiffer spring and higher ζharness could initiate total power harness at a higher flow velocity and obtain more power.
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April 2018
Research-Article
Flow-Induced Vibration and Hydrokinetic Power Conversion of Two Staggered Rough Cylinders for 2.5 × 104 < Re < 1.2 × 105
Wanhai Xu,
Wanhai Xu
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: xuwanhai@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: xuwanhai@tju.edu.cn
Search for other works by this author on:
Chunning Ji,
Chunning Ji
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: cnji@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: cnji@tju.edu.cn
Search for other works by this author on:
Hai Sun,
Hai Sun
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: sunhai2009@gmail.com
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: sunhai2009@gmail.com
Search for other works by this author on:
Wenjun Ding,
Wenjun Ding
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
School of Marine Science and Technology,
Northwestern Polytechnical University,
Xi'an 710072, China
e-mail: dingwen@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145;
School of Marine Science and Technology,
Northwestern Polytechnical University,
Xi'an 710072, China
e-mail: dingwen@umich.edu
Search for other works by this author on:
Michael M. Bernitsas
Michael M. Bernitsas
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
Department Naval Architecture
and Marine Engineering,
Department Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145;
Department Naval Architecture
and Marine Engineering,
Department Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
Search for other works by this author on:
Wanhai Xu
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: xuwanhai@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: xuwanhai@tju.edu.cn
Chunning Ji
State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: cnji@tju.edu.cn
Simulation and Safety,
Tianjin University,
Tianjin 30072, China;
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145
e-mail: cnji@tju.edu.cn
Hai Sun
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: sunhai2009@gmail.com
University of Michigan,
Ann Arbor, MI 48109-2145;
College of Aerospace and Civil Engineering,
Harbin Engineering University,
Harbin 150001, China
e-mail: sunhai2009@gmail.com
Wenjun Ding
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
School of Marine Science and Technology,
Northwestern Polytechnical University,
Xi'an 710072, China
e-mail: dingwen@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145;
School of Marine Science and Technology,
Northwestern Polytechnical University,
Xi'an 710072, China
e-mail: dingwen@umich.edu
Michael M. Bernitsas
Marine Renewable Energy Laboratory,
University of Michigan,
Ann Arbor, MI 48109-2145;
Department Naval Architecture
and Marine Engineering,
Department Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
University of Michigan,
Ann Arbor, MI 48109-2145;
Department Naval Architecture
and Marine Engineering,
Department Mechanical Engineering,
CTO Vortex Hydro Energy,
Ann Arbor, MI 48108
e-mail: michaelb@umich.edu
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 1, 2017; final manuscript received November 17, 2017; published online February 8, 2018. Assoc. Editor: Celso P. Pesce.
J. Offshore Mech. Arct. Eng. Apr 2018, 140(2): 021905 (8 pages)
Published Online: February 8, 2018
Article history
Received:
April 1, 2017
Revised:
November 17, 2017
Citation
Xu, W., Ji, C., Sun, H., Ding, W., and Bernitsas, M. M. (February 8, 2018). "Flow-Induced Vibration and Hydrokinetic Power Conversion of Two Staggered Rough Cylinders for 2.5 × 104 < Re < 1.2 × 105." ASME. J. Offshore Mech. Arct. Eng. April 2018; 140(2): 021905. https://doi.org/10.1115/1.4038932
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