New & Renewable Energy (신재생에너지)

Korean Society for New and Renewable Energy (한국신·재생에너지학회)
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Effects of the Damping Ratios of Power Generators on Power Efficiency of an Ocean Renewable Energy Converter Utilizing Flow Induced Vibrations of Two Circular Cylinders

두 원형실린더의 유동유발진동 현상을 이용하는 해양신재생에너지 변환기의 발전 효율에 발전기의 감쇠비가 미치는 영향에 관한 연구

  • Kim, Eun Soo (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Park, Hongrae (Center of Ship and Offshore Structure, Daewoo Shipbuilding and Marine Engineering) ;
  • Kim, Dong Hwi (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Baek, Hyung-min (Department of Naval Architecture and Ocean Engineering, Pusan National University) ;
  • Bernitsas, Michael M. (Department of Naval Architecture and Marine Engineering, University of Michigan)
  • Received : 2019.09.26
  • Accepted : 2020.01.28
  • Published : 2020.03.25
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Abstract

Most countries in the world are trying to reduce the use of fossil fuels in the production of electricity and replace them with renewable energy technologies. In Korea, there are abundant ocean renewable energy sources that will play an important role in power generation in the future. This paper introduces a new tidal energy converter utilizing flow induced vibration (FIV), which can work efficiently, even in the currents slower than 1.0m/s. All tests were conducted at the Marine Renewable Energy Laboratory at the University of Michigan to examine the effects of the damping ratio of the electric generators on the power outputs and power efficiencies. In these tests, two identical circular cylinders were used, and passive turbulence controllers were applied to the surface of the cylinders to enhance the FIV. The experimental results showed that by using the two cylinders in the FIV, the power output and efficiency reached up to 31 W and 36%, respectively. In particular, the results showed that the power efficiency was higher at the relatively low flow speed (4

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References

  1. Byun, Y.H., and Park, N., 2018, "Analysis of international joint research into new and renewable energy technology", New. Renew. Energy, 14(1), 4-11. https://doi.org/10.7849/ksnre.2018.3.14.1.004
  2. Korea Energy Agency, 2018, "Global trend of car sales ban on internal combustion Engines", http://www.energy.or.kr/web/kem_home_new/energy_issue/mail_vol71/pdf/issue_174_01_02.pdf
  3. Yun, S., Kim, Y., Moon, H., Im, H., and Kwon, P., 2019, "Study on utilizing electric vehicles for the variability of renewable energy", New. Renew. Energy, 15(2), 74-80. https://doi.org/10.7849/ksnre.2019.6.15.2.074
  4. Byun, D.S., Hart, D.E., and Jeong, W.J., 2013, "Tidal current energy resource off the south and west coasts of Korea: preliminary observation- derived estimates", Energies, 6(2), 566-578. https://doi.org/10.3390/en6020566
  5. Jeon, W., Cho, S., and Cho, I., 2019, "Estimating the uncertainty of net load of 2030 renewable generation", New. Renew. Energy, 15(4), 28-38. https://doi.org/10.7849/ksnre.2019.12.15.4.028
  6. Bernitsas, M.M., Ben-Simon, Y., Raghavan, K., and Garcia, E.M.H., 2009, "The VIVACE converter: model tests at high damping and Reynolds number around 105,000", J. Offshore Mech. Arct. Eng., 131(1), 011102. https://doi.org/10.1115/1.2979796
  7. Bernitsas, M.M., and Raghavan, K., 2009, "Fluid motion energy converter", US Patent No. 7,493,759, February 24, 2009.
  8. Bernitsas, M.M., and Raghavan, K., 2011, "Enhancement of vortex induced forces and motion through surface roughness control", US Patent No. 8,042,232, November 1, 2011.
  9. Kim, E.S., Bernitsas, M.M,. and Kumar, A.R., 2013, "Multi-cylinder flow induced motions: Enhancement by passive turbulence control at 28,000 < Re < 120,000", J. Offshore Mech. Arct.Eng., 135(2), 021802. https://doi.org/10.1115/1.4007052
  10. Kim, E.S., and Bernitsas, M.M., 2016, "Performance prediction of horizontal hydrokinetic energy converter using multiple-cylinder synergy in flow induced motion", Appl. Energy, 170, 92-100 https://doi.org/10.1016/j.apenergy.2016.02.116
  11. Yuce, M.I., and Muratoglu, A., 2015, "Hydrokinetic energy conversion systems: a technology status review", Renew. Sustain. Energy Rev., 43, 72-82. https://doi.org/10.1016/j.rser.2014.10.037
  12. Sun, H., Kim, E.S., Nowakowski, G., Mauer, E., and Bernitsas, M.M., "Effect of mass-ratio, damping, and stiffness on optimal hydrokinetic energy conversion of a single, rough cylinder in flow induced motions", Renew. Energy, 99, 936-959. https://doi.org/10.1016/j.renene.2016.07.024
  13. Sun, H., Kim, E.S., Bernitsas, P.M., and Bernitsas, M.M., 2015, "Virtual spring-damping system for flowinduced motion experiments", J. Offshore Mech. Arct. Eng., 137(6), 061801. https://doi.org/10.1115/1.4031327
  14. Sun, H., Kim, E.S., Nowakowski, G., Mauer, E., and Bernitsas, M.M., 2019, "Flow-induced vibration of tandem circular cylinders with selective roughness: Effect of spacing, damping, and stiffness", Eur. J. Mech. B Fluids, 74, 219-241. https://doi.org/10.1016/j.euromechflu.2018.10.024