PROBLEMS OF SCALE EFFECT ON HULL WAKE IN THE OPTIMISATION OF PROPELLER DESIGN. THEORETICAL/EXPERIMENTAL METHODS OF INVESTIGATION USED BY CETENA

Scientifically rigorous prediction of the wake-field velocities in which the propeller has to function is not yet possible, but they can be determined by several theoretical/experimental for semi- empirical methods that take into account, with various degrees of of reliability, the scale effect in the model-to-ship wake correlation. In this paper <presented at the NAV-82 Conference, Naples, Dec. 1982>, the Authors discuss this scale-effect problem and describe the theoretical/experimental methods adopted at CETENA for carrying out wake surveys and analysing and processing the data. The importance of adopting a technique, even if approximate, for correcting for the scale effect is illustrated in a comparison and discussion of two calculated solutions for the design of a wake-adapted propeller for the same ship <a ro/ro container-ship>. The ITTC 1978 method is used for one solution; for the other, the method described by Sasajima and Tanaka in a 1966 paper is used. The relevance of this scale-effect problem to fluctuating propeller loads and to cavitation is also discussed.

  • Supplemental Notes:
    • Marina Ital., 80 <1982>, p.24 <No.11-12> (11 pp., 10 ref., 2 tab., 5 graphs, 3 diag.)
  • Authors:
    • Colombo, A
    • Allieri, E
  • Publication Date: 1982

Language

  • Italian

Subject/Index Terms

  • Subject Areas: Marine Transportation;

Filing Info

  • Accession Number: 00684622
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Aug 14 1995 12:00AM