INVESTIGATION INTO THE PROPULSIVE PERFORMANCE OF SUPER TANKERS WITH BULBOUS BOW--SCALE EFFECT AND AFT BODY SHAPES OF TWIN-SCREW SHIPS

The report deals with research into the scale of resistance and self-propulsion factors, as well as the effect of the stern shape upon the propulsive performance for extremely full hull forms with twin screws. The main results obtained from the test are as follows: 1. Variation of form factors due to Froude number differs in tendency for each of the test conditons, and though the values of the wake and thrust deduction coefficients vary with Reynolds numbers, the values of the relative rotative efficiency are almost constant over the test range. 2. Remarkable differences are not found in the propulsive performance for such full aft bodies and aft frameline shapes. 3. Wake gain may be expected by designing the bossing properly or choosing a proper direction of propeller rotation. Accordingly, it may be necessary to investigate precisely the characteristics of the wake by 5-hole pitot tubes for instance. In Japanese.

• Corporate Authors:

  Ship Research Institute, Tokyo

  38-1, 6-chome, Shinkawa, Mitaka-shi
  Tokyo,   Japan 

  Ship Research Institute, Tokyo

  38-1, 6-chome, Shinkawa, Mitaka-shi
  Tokyo,   Japan 
• Authors:
  • Yokoo, K
  • TAKAHASHI, H
  • Kawakami, Y
• Publication Date: 1971-3

Media Info

• Features: Figures; Tables;
• Pagination: p. 51-58
• Serial:
  • Ship Research Institute, Report of
  • Volume: 8
  • Issue Number: 2
  • Publisher: Ship Research Institute, Tokyo

Subject/Index Terms

• TRT Terms: Bows; Froude number; Performance; Propulsion; Resistance tests; Tests
• Uncontrolled Terms: Scale effect
• Old TRIS Terms: Bulbous bows; Effects; Propulsive performance; Self propulsion
• Subject Areas: Design; Marine Transportation;

Filing Info

• Accession Number: 00033659
• Record Type: Publication
• Source Agency: Ship Structure Committee
• Files: TRIS
• Created Date: Jul 28 1973 12:00AM