DEVELOPMENT OF ANALYTIC METHODS IN B-SERIES PROPELLOR DESIGN FOR APPLICATION IN COMPUTER PROGRAMS

This thesis deals with the preliminary design of the propeller using the B-screw series. A brief description of the overall preliminary ship design process is given in order to show where the propeller design problem fits in the overall solution scheme. Then the B-screw series is described and its accuracy is evaluated. This analysis showed that the original test results were in the laminar flow condition which in turn introduced some inaccuracies. A method to correct this has been proposed and implemented. The modified results have proven to be within plus or minus 2% in open water efficiency when compared with results obtained in independent tests. Next the problem of selecting the number of propeller blades and the propeller expanded area ratio in order to avoid vibration and excessive cavitation is discussed. Then the classical optimization problem involving the propeller-hull and wake is stated in mathematical terms. Using this as a basis, the mathematical formulation is extended to include the machine and a statistical description of the environment. This now allows solving machine-propeller-hull-wake problem and defining more meaningful optimization criterion such as minimizing fuel consumption. Finally, this extended formulation is applied in the example of selecting a propeller for a containership operating in a specified route with a known engine.

  • Corporate Authors:

    Massachusetts Institute of Technology

    Sea Grant Program, 77 Massachusetts Avenue
    Cambridge, MA  USA  02139
  • Authors:
    • Triantafyllou, M S
  • Publication Date: 1977-2

Subject/Index Terms

Filing Info

  • Accession Number: 00159497
  • Record Type: Publication
  • Source Agency: Massachusetts Institute of Technology
  • Report/Paper Numbers: MS Thesis
  • Files: TRIS
  • Created Date: Aug 31 1977 12:00AM