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Effect of mass-ratio, damping, and stiffness on optimal hydrokinetic energy conversion of a single, rough cylinder in flow induced motions

Author

Listed:
  • Sun, Hai
  • Kim, Eun Soo
  • Nowakowski, Gary
  • Mauer, Erik
  • Bernitsas, Michael M.

Abstract

Flow Induced Motions (FIMs) of a single, rigid, circular cylinder with end-springs are investigated for Reynolds number 30,000 ≤ Re ≤ 120,000 with mass ratio, damping, and stiffness as parameters. Selective roughness is applied to enhance FIM and increase the hydrokinetic energy captured by the VIVACE (Vortex Induced Vibration for Aquatic Clean Energy) Converter at higher Reynolds numbers. The second generation of virtual spring-damping system Vck, recently developed in the Marine Renewable Energy Laboratory (MRELab), enables embedded computer-controlled change of viscous-damping and spring-stiffness for fast and precise oscillator modeling. Experimental results for amplitude response, frequency response, energy harvesting, and efficiency are presented and discussed. All experiments were conducted in the Low Turbulence Free Surface Water (LTFSW) Channel of the MRELab of the University of Michigan. The main conclusions are: (1) The oscillator can harness energy from flows as slow as 0.3946 m/s with no upper limit. (2) Increasing the spring stiffness, shifts the VIV synchronization range to higher flow velocities, resulting in reduced gap between VIV and galloping, where the harnessed power drops. (3) In galloping, the harnessed power increases with the mass ratio. (4) Local optima in energy conversion efficiency appear at the beginning of the VIV upper branch and at the beginning of galloping. (5) Local optima in power appear at the end VIV upper branch and at the beginning of galloping.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:936-959
    DOI: 10.1016/j.renene.2016.07.024
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    References listed on IDEAS

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    1. Narendran, K. & Murali, K. & Sundar, V., 2016. "Investigations into efficiency of vortex induced vibration hydro-kinetic energy device," Energy, Elsevier, vol. 109(C), pages 224-235.
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