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Hydrokinetic Power Conversion Using Vortex-Induced Oscillation with Cubic Restoring Force

Author

Listed:
  • Mengyu Li

    (College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China)

  • Christopher Bernitsas

    (Marine Renewable Energy Laboratory, Department of Naval Architecture & Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145, USA
    Intern, Detroit Country Day—Upper School, 22305 W 13 Mile Rd, Beverly Hills, MI 48025, USA)

  • Guo Jing

    (Mathematical Sciences Department, Worcester Polytechnic Institute, Worcester, MA 01609, USA)

  • Sun Hai

    (College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin 150001, China
    Marine Renewable Energy Laboratory, Department of Naval Architecture & Marine Engineering, University of Michigan, 2600 Draper Road, Ann Arbor, MI 48109-2145, USA
    Vortex Hydro Energy, Ann Arbor, MI 48108, USA
    College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China)

Abstract

A cubic-spring restoring function with high-deformation stiffening is introduced to passively improve the harnessed marine hydrokinetic power by using flow-induced oscillations/vibrations (FIO/V) of a cylinder. In these FIO/V experiments, a smooth, rigid, single-cylinder on elastic end-supports is tested at Reynolds numbers ranging from 24,000 < Re < 120,000. The parameters of the tested current energy converter (CEC) are cubic stiffness and linear damping. Using the second generation of digital virtual spring-damping (Vck) controller developed by the Marine Renewable Energy Laboratory (MRELab), the cubic modeling of the oscillator stiffness is tested. Experimental results show the influence of the parameter variation on the amplitude, frequency, energy conversion, energy efficiency, and power of the converter. All experiments are conducted in the low turbulence-free surface water (LTFSW) channel of the MRELab of the University of Michigan. The main conclusions are: (1) The nonlinearity in the cubic oscillator is an effective way to extend the vortex-induced vibration (VIV) upper branch, which results in higher harnessing power and efficiency compared to the linear stiffness cylinder converter. (2) Compared to the linear converter, the overall power increase is substantial. The nonlinear power optimum, occurring at the end of the VIV upper branch, is 63% higher than its linear counterpart. (3) The cubic stiffness converter with low harnessing damping achieves consistently good performance in all the VIV regions because of the hardening restoring force, especially at higher flow velocity.

Suggested Citation

  • Mengyu Li & Christopher Bernitsas & Guo Jing & Sun Hai, 2020. "Hydrokinetic Power Conversion Using Vortex-Induced Oscillation with Cubic Restoring Force," Energies, MDPI, vol. 13(12), pages 1-18, June.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:12:p:3283-:d:376426
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    References listed on IDEAS

    as
    1. Sun, Hai & Ma, Chunhui & Bernitsas, Michael M., 2018. "Hydrokinetic power conversion using Flow Induced Vibrations with cubic restoring force," Energy, Elsevier, vol. 153(C), pages 490-508.
    2. Sun, Hai & Kim, Eun Soo & Nowakowski, Gary & Mauer, Erik & Bernitsas, Michael M., 2016. "Effect of mass-ratio, damping, and stiffness on optimal hydrokinetic energy conversion of a single, rough cylinder in flow induced motions," Renewable Energy, Elsevier, vol. 99(C), pages 936-959.
    3. Sun, Hai & Bernitsas, Michael M., 2019. "Bio-Inspired adaptive damping in hydrokinetic energy harnessing using flow-induced oscillations," Energy, Elsevier, vol. 176(C), pages 940-960.
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    Cited by:

    1. Rashki, M.R. & Hejazi, K. & Tamimi, V. & Zeinoddini, M. & Bagherpour, P. & Aalami Harandi, M.M., 2023. "Electromagnetic energy harvesting from 2DOF-VIV of circular oscillators: Impacts of soft marine fouling," Energy, Elsevier, vol. 282(C).
    2. Li, Ningyu & Park, Hongrae & Sun, Hai & Bernitsas, Michael M., 2022. "Hydrokinetic energy conversion using flow induced oscillations of single-cylinder with large passive turbulence control," Applied Energy, Elsevier, vol. 308(C).

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