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Resistance Reduction of a High Speed Small Boat by Air Lubrication

Jang Jin-Ho    (SSMB, Shipbuilding & Plant Research Institute, Samsung Heavy Industries Co., LTD.   ); Kim Hyo-Chul    (RIMSE, Department of Naval Architecture & Ocean Eng., Seoul National University  );
  • 초록

    The resistance reduction by an air lubrication effect of a large air cavity covering the hull bottom surface and the similarity relations involved have been investigated with a series of towing tank tests of three geometrically similar models. The test results of geometrically similar models have indicated that a large air cavity was formed beneath the bottom having a backward-facing step by artificially supplying air is effective for resistance reduction. The areas of air cavity and the required flow rates of air are directly related to the effective wetted surface area. The traditional extrapolation methods seem to be applicable to the estimation of the resistance in the tested range if corrections are made to account the changes in the frictional resistance caused by the changes in the effective wetted surface area. To investigate the effectiveness of air lubrication in improving the resistance performance of a practical ship, a small test boat having a backward-facing step under its bottom has been manufactured and speed trials in a river have been performed. Air has been supplied artificially into the downstream region of the bottom step to form a large air cavity covering the bottom surface. The results have confirmed the practical applicability of air lubrication for the resistance reduction of a small high-speed boat.


  • 주제어

    air lubrication .   air cavity .   frictional resistance .   resistance reduction .   bottom step .   geometrically similar models .   test boat .   speed trial.  

  • 참고문헌 (10)

    1. ITTC. 2002. Report of The Resistance Committee Proc. 23rd ITTC, Venice, Italy 
    2. Kim, K.-H., H. Kim and S.-H. Lee. 1997. Effects of Air Injections on the Resistance Reduction ofa Semi-Planing Hull. Proc. HSMV 97, Napoli, Italy 
    3. Yokoo, K. and H. Takahashi. 1960. Tank Experiments on a Hydroplane Model. Transportation Technical Research Institute, Report No. 42 
    4. Jang, J. H. and H. Kim. 1999. On the Reduction of a Ship Resistance by Attaching an Air Cavity to Its Flat Bottom. Journal of the Society of Naval Architects of Korea, Vol. 36, No.2 
    5. Butuzov, A.A. 1997. A Review of the State-of-the-Art in Air Lubricated Bottom Ship Development. Technical Report, KSRI/STEPI-03-F, Krylov Ship Research Institute 
    6. Jang, J. H., H. Kim and S.-H. Lee. 1999. On the Drag Reduction of a Passenger Ship with Air Cavity. Journal of Ship and Ocean Technology, Vol. 3 
    7. Knapp, R.T., J.W. Daily and F.G. Hammitt 1970. Cavitation, McGraw-Hill, USA 
    8. Bushnell, D.M. and J.N. Hefner(Editors). 1990. Viscous Drag Reduction in Boundary Layers. The American Institute of Aeronautics, Inc., Washington, DC, USA 
    9. Sato, T., T. Nakata, M. Takeshita, Y. Tsuchiya and H. Miyata 1997. Experimental Study on Friction Reduction of a Model Ship by Air Lubrication. Journal of the Society of Naval Architects of Japan, Vol. 182 
    10. Tanaka, H., M. Nakato, Nakatake, K., T. Ueda and S. Araki. 1991. Cooperative Resistance Tests with Geosim Models of a High-Speed Semi-Displacement Craft. Journal of the Society of Naval Architects of Japan, Vol. 169 

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