SHIP RESISTANCE AND PROPULSION: MODEL/SHIP CORRELATION METHODS

This paper describes a reliable method for measuring ship thrust. The corrections that must be applied to the results for the model and the ship in order to bring them to a comparable basis are described separately. The associated changes in the efficiency, the revolutions and the thrust deduction action are given as functions of the change in propeller loading. A comparison of the most useful methods of transferring from the model results to the ship results using the frictional coefficients of Froude, Schoenherr, ITTC and Schultz-Grunow is made, and the accuracy of the different methods is given. Since all these methods give unsatisfactory results, a new correlation function for transferring the model values to the ship is developed for the viscous resistance. A new function for the wake fraction correlation between the model and the ship is also developed. The fundamentals underlying the correlation for the thrust deduction fractions are calculated. The thrust/torque ratio is found to be independent of the draft provided that the screw remains underwater in this case, and the correlation between the model and ship is likewise found to be independent of scale.

  • Supplemental Notes:
    • Report; Translation of Jahrbuch der Schiffbautechnischen Gesellschaft, Vol.61, 1967, pp.163-208
  • Authors:
    • Chirila, J V
  • Publication Date: 1967

Language

  • German

Media Info

  • Pagination: 84 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00661007
  • Record Type: Publication
  • Source Agency: Maritime Technical Information Facility
  • Report/Paper Numbers: BSRA-TRANS-3472
  • Files: TRIS
  • Created Date: Jul 21 1994 12:00AM