Journal of the Society of Naval Architects of Korea (대한조선학회논문집)

The Society of Naval Architects of Korea (대한조선학회)
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Study on the Evaluation of Frictional Drag Reduction by Air Lubrication and the Arrangement of Air Injection Parts for a Liquefied Natural Gas Carrier

공기윤활에 의한 액화천연가스운반선의 마찰저항저감 평가 및 공기 분사부 배치에 대한 연구

  • Kim, Hee-Taek (Samsung Heavy Industries Co., Ltd.) ;
  • Kim, Hyoung-Tae (Department of Naval Architecture & Ocean Engineering, Chungnam National University) ;
  • Kim, Hyun-Joe (Samsung Heavy Industries Co., Ltd.) ;
  • Kim, Jung-Joong (Korea Research Institute of Ships and Ocean Engineering (KRISO))
  • Received : 2021.02.26
  • Accepted : 2021.03.20
  • Published : 2021.06.20
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Abstract

Brake Horse Power (BHP) reduction ratios by air injection to the underside of the hull surface in an actual ship are predicted using an unstructured finite-volume CFD solver and compared with the sea trial results. In addition, air lubrication system installed on the existing vessel is investigated to find a good solution for additional drag reduction. As a results, it is found that the thickness of the air layer should be minimized within a stable range while securing the area covered by the air layer as much as possible. Furthermore, the amount of frictional drag reduced by air injection is found to be independent of surface roughness and still effective on rough surface. Based on the results of this study, it is expected that systematic and reliable air lubrication system can be designed and evaluated using the proposed method.

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References

  1. ABS, 2019. Air Lubrication Technology.
  2. Antal, S. P., Lahey, R. T. & Flaherty, J. E., 1991. Analysis of phase distribution in fully developed laminar bubbly two-phase flow. International Journal of Multiphase Flow, 17, pp.635-652. https://doi.org/10.1016/0301-9322(91)90029-3
  3. Foreship, 2016. A smoother path to air lubrication - article in 'The Naval Architect', The Royal Institution of Naval Architects, pp.61-62.
  4. Kim, H. T., 2020. Study on drag reduction technique with air layer Injection to commercial ships based on computational fluid dynamics simulation. Ph.D. thesis, Naval Architecture and Ocean Engineering, Chungnam National University, Daejeon, Korea.
  5. Kim, H.T., Kim, H.T. & Lee, D.Y., 2019. Study on the skin-frictional drag reduction phenomenon by air layer using CFD technique. International Journal of Naval Architects and Ocean Engineering, 56(4), pp.361-372.
  6. Larsson, L. & Raven, H.C., 2010. The principles of naval architecture series: ship resistance and flow. The Society of Naval Architects and Marine Engineers.
  7. Lee, J.D., et al., 2017. Full scale applications of air lubrication for reduction of ship frictional drag. SNAME Maritime Convention 2017, Houston, USA, 23-28 October 2017.
  8. Mizokami, S. et al., 2010. Experimental study of air lubrication method and verification of effects on actual hull by means of sea trial. Mitsubishi Heavy Industries Technical Review, 47(3), pp.41-47.
  9. Naval Ship's Technical Manual. 2002. Waterborne Underwater Hull Cleaning of Navy Ships, Publication #S908-CQ-STM-010/CH-081R4. Naval Sea Systems Command.
  10. Nikuradse, J., 1933. Stromungsgesetze in rauhen Rohren. VDI-Forschungsheft 361.
  11. Schiller, L., & Naumann, A., 1933. Uber die grundlegenden Berechnungen bei der Schwerkraftaufbereitung. VDI Zeits, 77(12), pp.318-320.
  12. Schlichting, H., 1979. Boundary layer theory. Springer.
  13. Schultz, M.P., 2004. Frictional drag of antifouling coating system. ASME Journal of Fluids Engineering, 126:1039-1047. https://doi.org/10.1115/1.1845552
  14. Silberschmidt, N., Tasker, D., Pappas, T. & Johannesson, J., 2016. Silverstream system - air lubrication performance verification and design development. Conference of Shipping in Changing Climate, Newcastle, UK, 10-11 November 2016.
  15. Tanaka, T., 2011. Green technologies featuring the Mitsubishi air lubrication system. 1st World NAOE Forum, Osaka, Japan, 25 November 2011.
  16. Tomiyama, A., Tamai, H., Zun, I. & Hosokawa, S., 2002. Transverse migration of single bubbles in simple shear flows. Chemical Engineering Science, 57, pp.1849-1858. https://doi.org/10.1016/S0009-2509(02)00085-4