Journal of the Korean Society for Marine Environment & Energy (한국해양환경ㆍ에너지학회지)

The Korean Society for Marine Environment and Energy (한국해양환경•에너지학회)
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Hydrodynamic Aspects on Three-dimensional Effects of Vertical-axis Tidal Stream Turbine

조류발전용 수직축 터빈의 유체동력학적 3차원 효과에 관한 연구

  • Hyun, B.S. (Div. of Naval Architecture & Ocean Systems Eng., Korea Maritime Univ.) ;
  • Lee, J.K. (Div. of Naval Architecture & Ocean Systems Eng., Korea Maritime Univ.)
  • 현범수 (한국해양대학교 조선해양시스템공학부) ;
  • 이정기 (한국해양대학교 조선해양시스템공학부)
  • Received : 2012.10.15
  • Accepted : 2013.05.13
  • Published : 2013.05.25
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Abstract

Hydrodynamic aspects on three-dimensional effects were investigated in this study for simple and convenient conversion of tidal stream energy using a Vertical-Axis Turbine (VAT). Numerical approach was made to reveal the differences of flow physics between 2-D estimation and rigorous 3-D simulation. It was shown that the 3-D effects were dominant mainly due to the variation of tip vortices around the tip region of rotor blade, causing the loss of lift for steadily translating hydrofoil and the reduction of torque for rotating turbine blade. The 3-D effect was found to be rather prominent for the typical VATs considered in this paper. Simple and yet efficient 2-D approach with the correction of its three-dimensionality was also proposed for practical design and analysis of VAT.

조류발전용 수직축터빈(VAT)의 3차원적인 유체동력학적 성능을 효과적으로 예측할 수 있는 연구를 진행하였다. 수치해석은 2차원과 3차원으로 수행하였으며 이를 통해 물리적 유동현상의 차이를 파악하였다. 3차원 효과는 주로 날개 끝단에서 발생하는 날개끝 보오텍스가 주된 원인으로서, 이로 인해 터빈 날개가 내어주는 양력이 손실되고 회전하는 터빈은 토크가 감소하였다. 이러한 현상은 본 연구에서 채택한 통상적인 수직축 터빈의 스팬-직경비 범위에서 상당한 수준으로 나타남을 확인하였다. 본 연구에서는 대상 터빈을 선정하고 2차원으로 성능해석 후 3차원 효과를 보정하는 비교적 간단하고 효과적인 방법을 제안하였다.

Keywords

References

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  2. Study on Performance Variation According to the Arrangements of Adjacent Vertical-Axis Turbines for Tidal Current Energy Conversion vol.19, pp.2, 2016, https://doi.org/10.7846/JKOSMEE.2016.19.2.151