Journal of Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회논문집)

Korean Society of Coastal and Ocean Engineers (한국해안·해양공학회)
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Analysis of Flow Field Characteristics Inside a Shroud for Rotor Positions

로터 위치에 따른 쉬라우드 내부 유동장 특성 분석

  • Bak, Da In (Department of Mechanical Engineering, Wonkwang University) ;
  • Han, Seok Jong (Department of Mechanical Engineering, Wonkwang University) ;
  • Lee, Uk Jae (Department of Civil and Environmental Engineering, Wonkwang University) ;
  • Lee, Sang Ho (Department of Mechanical Engineering, Wonkwang University) ;
  • Choi, Hyuk Jin (Coast and Ocean Technology Research Institute) ;
  • Im, Jong Seok (Hwajin Enterprise)
  • Received : 2019.11.19
  • Accepted : 2020.02.17
  • Published : 2020.02.28
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Abstract

Numerical analysis was carried out to analyze the flow fields and mechanical output of a rotor for various positions and inlet flow rates in a shroud, and it was compared with experimental data. Rotor and seawater current largely affects the flow field characteristics in the shroud system. Especially the mechanical output of the rotor increased with axial position near the center of the cylinder, and it gradually decreased close to the entrance and exit. Also, the rotor output increased with the inlet velocity. Axial and angular momentum of flow along the cylinder region rapidly increased and reached a peak, and then decreased as it passed through the rotor, while there was no significant change in the cylinder region. It is expected that these results can be used as applicable design data for the development of the tidal power generation system.

로터 위치 및 쉬라우드 입구 유속 변화에 따른 쉬라우드 내부 유동장 및 기계적 출력 분석을 위해 수치해석을 수행하였고 이를 실험결과와 비교하였다. 로터와 해수의 유동조건은 쉬라우드 조류발전 시스템 내 유동장 특성에 많은 영향을 미치게 된다. 특히 실린더 내 축 방향 위치에 따른 로터의 기계적 출력은 실린더 중앙 이후까지 점차 증가하며, 입·출구 부근에서는 감소하였다. 또한 쉬라우드 입구 유속이 증가함에 따라 로터 출력량이 점차 증가하였다. 축 방향 운동량과 각운동량은 로터를 통과하면서 급격하게 증가 및 감소하였으며, 전방을 포함한 그 외 영역에서의 큰 변화는 없었다. 이러한 결과들은 조류발전 시스템 개발의 기초 자료로 다양하게 활용될 수 있을 것으로 기대된다.

Keywords

References

  1. ANSYS Inc. (2018). FLUENT User's Guide.
  2. Dassault System Inc. (2018). Solidworks User'Manual.
  3. Fleming, C.F. and Willden, R.H. (2016). Analysis of bi-directional ducted tidal turbine performance. International Journal of Marine Energy, 16, 162-173. https://doi.org/10.1016/j.ijome.2016.07.003
  4. Han, S.J., Lee, U.J., Park, D.I., Lee, S.H., Jeong, S.T. and Lee, S.S. (2019). Experimental performance analysis using a compact scale model for shroud tidal current power generation system. Journal of Korean Society of Coastal and Ocean Engineers, 31(4), 221-228 (in Korean). https://doi.org/10.9765/KSCOE.2019.31.4.221
  5. Jo, C.H., Lee, K.H., Yim, J.Y. and Chae, K.S. (2009). Performance evaluation of TCP device with upstream duct installation. Journal of the Korean Society for Marine Environment and Energy, 77-80 (in Korean).
  6. Kim, J.W. and Lee, S.H. (2012). A study on seawater flow characteristics inside the shrouds used in tidal current generation systems for various geometric angles under constant tidal current velocity. Journal of Korean Society of Coastal and Ocean Engineers, 24(2), 77-83 (in Korean). https://doi.org/10.9765/KSCOE.2012.24.2.077
  7. Lee, U.J., Han, S.J., Jeong, S.T. and Lee, S.H. (2019). Analysis of flow velocity change in blade installed shroud system for tidal current generation. Journal of Korean Society of Coastal and Ocean Engineers, 31(1), 9-16 (in Korean). https://doi.org/10.9765/KSCOE.2019.31.1.9
  8. Lee, U.J., Lee, S.H., Han, S.J., Jeong, S.T., Choi, H.J. and Ko, D.H. (2018). Numerical analysis for the optimum design of shroud tidal stream generation system. Journal of Korean Society of Coastal and Ocean Engineers, 30(3), 134-141 (in Korean). https://doi.org/10.9765/KSCOE.2018.30.3.134
  9. Lee, J.K. and Hyun, B.S. (2016). Study on performance variation according to the arrangements of adjacent vertical-axis turbines for tidal current energy conversion. Journal of the Korean Society for Marine Environment & Energy, 19(2), 151-158. https://doi.org/10.7846/JKOSMEE.2016.19.2.151
  10. Orszag, S.A., Yakhot, V., Flannery, W.S., Boysan, F., Choudhury, D., Maruzewski, J. and Patel, B. (1933). Renormalization group modeling and turbulence simulations. International Conference on Near-Wall Turbulent Flows. 1031-1046 (in Elsevier, Amsterdam).
  11. Zhou, J.W., Wang, D.Z. and Li, Y.N. (2013). Optimization and Flow Analysis of Ducted Tidal Stream Turbine. Trans Tech Publications Ltd, 1, 694-697.