REDUCTION OF PROPELLER-INDUCED PRESSURE FLUCTUATIONS BY AN AIR LAYER AT THE HULL

By establishing a layer of air at the hull surface above the propeller, the propeller-induced pressure fluctuations on the hull can be reduced. A theoretical calculation of the air layer thickness necessary to obtain a significant reduction of the pressure amplitudes is presented. By keeping the air in a cluster of "honeycomb" cells with vertical axes and with their lower ends open, little or no air needs to be continuously supplied. The results of model experiments with such a system are presented and compared with the calculations. It is concluded that the system may be useful for reducing cavitation noise and local structural damage in the aft peak area. Reduction of afterbody and superstructure vibrations in general will require very large parts of the afterbody hull surface to be protected by air.

  • Corporate Authors:

    Royal Norwegian Council for Scientific & Indus Res

    Radhusgaten 8, Sentrum
    Oslo,   Norway 
  • Authors:
    • Huse, E
    • Nielsen, F G
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: p. 16-23
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00177411
  • Record Type: Publication
  • Source Agency: Royal Norwegian Council for Scientific & Indus Res
  • Files: TRIS
  • Created Date: Jul 19 1978 12:00AM