두 원형실린더의 유동유발진동 현상을 이용하는 해양신재생에너지 변환기의 발전 효율에 발전기의 감쇠비가 미치는 영향에 관한 연구
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
1
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
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<U*<U or 0.45<U<0.9 m/s). This indicates that this tidal converter can work efficiently, even at low flow speeds, and will enable the use of more tidal energy.
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<U*<U or 0.45<U<0.9 m/s). This indicates that this tidal converter can work efficiently, even at low flow speeds, and will enable the use of more tidal energy.
참고문헌 (14)
- 변영호, "신･재생에너지 분야 국제공동연구현황 분석과 함의", 신재생에너지, 14(1), pp.4~11 (2018), 한국신·재생에너지학회[DOI]
- "Global trend of car sales ban on internal combustion Engines" (2018)[URL]
- 윤성권, "재생에너지 변동성 대응을 위한 전기차 활용 방안 연구", 신재생에너지, 15(2), pp.74~80 (2019), 한국신·재생에너지학회[DOI]
- Byun, D. S., "Tidal current energy resource off the south and west coasts of Korea : preliminary observation-derived estimates", Energies, 6(2), pp.566~578 (2013)
- 전우영, "태양광 및 풍력 확률모형을 이용한 2030 재생에너지 순수요 불확실성 추정 연구", 신재생에너지, 15(4), pp.28~38 (2019), 한국신·재생에너지학회[DOI]
- Bernitsas, M. M., "The VIVACE converter : model tests at high damping and Reynolds number around 105, 000", J. Offshore Mech. Arct. Eng, 131(1), pp.011102~ (2009)
- Bernitsas, M. M., "Fluid motion energy converter, US Patent No. 7,493,759", ~ (2009)
- Bernitsas, M. M., "Enhancement of vortex induced forces and motion through surface roughness control, US Patent No. 8,042,232", ~ (2011)
- Kim, E. S., "Multi-cylinder flow induced motions : Enhancement by passive turbulence control at 28, 000 < Re < 120, 000", J. Offshore Mech. Arct. Eng, 135(2), pp.021802~ (2013)
- Kim, E. S., "Performance prediction of horizontal hydrokinetic energy converter using multiple-cylinder synergy in flow induced motion", Appl. Energy, 170, pp.92~100 (2016)
- Yuce, M. I., "Hydrokinetic energy conversion systems : a technology status review", Renew. Sustain. Energy Rev, 43, pp.72~82 (2015)
- Sun, H., "Effect of mass-ratio, damping, and stiffness on optimal hydrokinetic energy conversion of a single, rough cylinder in flow induced motions", Renew. Energy, 99, pp.936~959
- Sun, H., "Virtual spring-damping system for flowinduced motion experiments", J. Offshore Mech. Arct. Eng, 137(6), pp.061801~ (2015)
- Sun, H., "Flow-induced vibration of tandem circular cylinders with selective roughness : Effect of spacing, damping, and stiffness", Eur. J. Mech. B Fluids, 74, pp.219~241 (2019)