POWER SAVING THROUGH A SHIP FORM THAT INFLUENCES BOUNDARY- LAYER WAKE

Some of the energy dissipated in the formation of the boundary layer around a moving ship can be recovered by the propeller converting it into thrust. The Author gives an account of tests on a ship model with a form designed to direct the detached boundary-layer towards the propeller, with the object of recovering more of this energy. The model, a "fish" form without parallel sides and a full forebody combined with a very fine afterbody, represented a single-screw, 253-m long, 16-knot cargo-ship. Its form was developed by distorting that of a model of good conventional shape, and of known performance, whose wake has been surveyed by measuring pressure losses in the water, well behind the model (1/4L astern of the AP). Similar surveys were carried out on the fish-form model. The article includes body plans and principal particulars of both hull-forms, and also diagrams giving the results of the surveys of each form with loaded propeller and without propeller; the survey results are discussed. The results of performance tests on the fish-form model are compared, in some detail, with those from the conventional model, and show, inter alia, that at 16 nots the fish form has about 5.8% less resistance and requires about 5.6% less power. These results, and their significance, are discussed. This work was carried out at the Hamburg tank, as part of the SFB 98 program.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0036603X
• Corporate Authors:

  Seehafen-Verlag Erik Blumenfeld

  Celsiusweg 15, Postfach 1347
  2000 Hamburg 50,   Germany 
• Authors:
  • Andersson, G O
• Publication Date: 1976-10

Media Info

• Features: References;
• Pagination: 4 p.
• Serial:
  • Schiff und Hafen
  • ISSN: 0036-603X

Subject/Index Terms

• TRT Terms: Boundary layer; Energy consumption; Fluid resistance; Fuel conservation; Hulls; Vehicle design; Wakes
• Uncontrolled Terms: Hull resistance; Ship design
• Old TRIS Terms: Boundary layer theory; Model testing; Power prediction; Wake analysis
• Subject Areas: Design; Energy; Marine Transportation;

Filing Info

• Accession Number: 00153102
• Record Type: Publication
• Source Agency: British Ship Research Association
• Files: TRIS
• Created Date: May 11 1977 12:00AM