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

The Society of Naval Architects of Korea (대한조선학회)
권호 표지
DOI QR코드

DOI QR Code

Experimental Assessment of the Drag Reduction Efficiency of the Outer-layer Vertical Blades

외부경계층 수직 날의 저항저감효과에 대한 실험적 연구

  • An, Nam-Hyun (Division of Shipbuilding and Marine Engineering, Koje College) ;
  • Chun, Ho-Hwan (ASERC (Advanced Ship Engineering Research Center), Pusan National University) ;
  • Lee, In-Won (ASERC (Advanced Ship Engineering Research Center), Pusan National University)
  • 안남현 (거제대학 조선선박기술계열) ;
  • 전호환 (부산대학교 첨단조선공학연구센터) ;
  • 이인원 (부산대학교 첨단조선공학연구센터)
  • Published : 2008.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

An experimental assessment has been made of the drag reducing efficiency of the outer-layer vertical blades, which were first devised by Hutchins (2003). The drag reduction efficiency of the blades was reported to reach as much as 30%. The assessment of the drag reducing efficiency is mainly restricted to the downstream region of the blades. Indeed, sufficient care has not been taken to such adverse effects as the increase in the wetted surface area and the flow disturbances due to the presence of the blades. In the present study, a series of drag force measurements in towing tank and circulating water channel has been performed toward the assessments of the total drag reduction efficiency of the outer-layer vertical blades.

Keywords

References

  1. Beckert, D.W. and Bartenwerfer, M., 1989, "The Viscous Flow on Surfaces with Longitudinal Ribs," J. Fluid Mechanics, Vol. 206, pp. 105-129 https://doi.org/10.1017/S0022112089002247
  2. Corbett, J.J. and Koehler, H.W., 2003, "Updated Emissions from Ocean Shipping," J. Geophysical Research, Vol. 108, No. D20, pp. ACH 9-1-9.13
  3. Hefner, J.N., Weinstein, L.M. and Bushnell, D.M., 1979, "Large-Eddy Breakup Scheme for Turbulent Viscous Drag Reduction," Paper of the Symposium on Viscous Drag Reduction, Nov. 7-8
  4. Hutchins, N., 2003, An Investigation of Largerscale Coherent Structures in Fully Developed Turbulent Boundary Layers, Ph.D. Thesis, University of Nottingham
  5. Jang, J. and Kim, H., 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, pp. 1-8
  6. Kim, D.S., Kim, H.T. and Kim, W.J., 2003, "Experimental Study of Friction Drag Reduction in Turbulent Flow with Microbubble Injection," Journal of the Society of Naval Architects of Korea, Vol. 40, No. 3, pp. 1-8
  7. Koo, B.G., Yoon, H.S. and Chun, H.H., 2004, "Turbulent Flow Analysis and Drag Reduction by Riblet Surfaces," Journal of the Society of Naval Architects of Korea, Vol. 41, No. 4, pp. 59-67 https://doi.org/10.3744/SNAK.2004.41.4.059
  8. Moffat, R.J., 1982, "Contributions to the Theory of Single-Sample Uncertainty Analysis," Trans. ASME J. Fluid Eng., Vol.104, pp. 250-260 https://doi.org/10.1115/1.3241818
  9. Schultz, M.P., 2004, "Frictional Resistance of Antifouling Coating System", Trans. ASME J. Fluid Eng., Vol.126, pp. 1039-1046 https://doi.org/10.1115/1.1845552
  10. White, F.M., 1991, Viscous Fluid Flow, 2nd Ed., McGraw Hill, p. 432
  11. Yoon, H.S. and Chun, H.H., 2005, "Drag Reduction in Turbulent Channel Flow with Periodically Arrayed Heating and Cooling Strips," Journal of the Society of Naval Architects of Korea, Vol. 42, No. 6, pp. 608-618 https://doi.org/10.3744/SNAK.2005.42.6.608