This paper discusses several aspects of ducted propellers that are important in ship propulsion. Possibly the most important aspect and the one about which least is known is the ducted propeller/hull interaction problem. The first section describes some of the empirical observations made in this area at NPL in the course of testing VLCC forms. The advantages to be gained with a steerable ducted propeller system are mentioned. The following sections deal with the effect that diffusers downstream of the rotor have on performance and the losses associated with tip clearance. Finally, the results of an extensive flow survey in the exit plane of a ducted propeller are given. This survey tends to confirm some of the earlier findings and shows good agreement with the velocities predicted using a simple analysis procedure. (Author)

  • Supplemental Notes:
    • Also published in the Royal Institution of Naval Architects; Symposium on Ducted Propellers, pp 20-34, 1973, Paper No. 3.
  • Corporate Authors:

    National Physical Laboratory, England

    Ship Division
    Teddington, Middlesex,   England 
  • Authors:
    • English, J W
    • Rowe, S J
  • Publication Date: 1974-4

Media Info

  • Pagination: 19 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00071708
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: NPL-Ship-178
  • Files: TRIS
  • Created Date: Nov 6 1974 12:00AM