An Advanced Study on the Development of Marine Lifting Devices Enhanced by the Blowing Techniques

  • Ahn Haeseong (Korea Ocean Research & Development Institute, KRISO/KORDI) ;
  • Yoo Jaehoon (Korea Ocean Research & Development Institute, KRISO/KORDI) ;
  • Kim Hyochul (Dept. of Naval Architecture & Ocean Engineering, Seoul National University)
  • Published : 2004.12.01

Abstract

High lifting devices used for control purposes have received much attention in the marine field. Hydrofoils for supporting the hull, roll stabilizer fins for developing the motion damping performance, rudders for maneuverability are the well-known devices. In the present study, the ability of the rudder with flap to produce high lift was analyzed. The boundary layer control, one of the flow control techniques, was adopted. Especially, to build the blown flap, a typical and representative type of a boundary layer control, a flapped rudder was designed and manufactured so that it could eject the water jet from the gap between the main foil and the flap to the flap surface tangentially. And it was tested in the towing tank. Simultaneously, to know the information about the 2-dimensional flow field, a fin model with similar characteristics as the rudder model applicable for the motion control was made and tested in the cavitation tunnel. In addition, local flow measurements were carried out to obtain physical information, for example, a surface pressure measurement and flow visualization around the flap. And CFD simulation was used to obtain information difficult to collect from the experiment about the 2-dimensional flow.

Keywords

References

  1. Ahn, H.S. 2003. An Experimental Study of the Coanda Effect on Flapped Control Surfaces. Ph. D thesis of Seoul Nat. Univ.
  2. Ahn, H.S. and H.C. Kim. 1999. An experimental study on the effects of water jet blowing on flapped rudder. J. Society of Naval Architects of Korea, 36, 1, 22-29
  3. Ahn, H.S. and RC. Kim. 2003. An experimental study of the coanda effect on flapped control surfaces. J. Society of Naval Architects of Korea, 40,5, 10-16
  4. Englar, Robert J. 1975. Circulation control for high lift and drag generation on STOL aircraft. J. Aircraft, 12, 5
  5. Lee, S.R, S.E. Kim, H.S. Ahn, J.K. Oh and H.C. Kim. 2003. Analysis of a Jet Controlled High-Lift Hydrofoil with a Flap. Ocean Engineering, 30, 16, 2117-2136
  6. Oh, J.K., H.S. Ahn, H.C. Kim, S.H. Lee and J.M. Lew. 2003. Application of coanda effect to a ship hydro foil. J. Ship and Ocean Technology, 7, 2, 29-39
  7. Williams, J. and S.FJ. Butler. 1963. Aerodynamic aspects of boundary layer control for high lift at low speeds. J. Royal Aeronautics Society, 67, 628, 201-223
  8. Wilson, M.B. and C. von Kerczek. 1979. An Inventory of Some Force Producers for Use in Marine Vehicle Control. DTNSRDC report, DTNSRDC-79/097