The Propulsion of an Ice Going Ship Ahead and Astern

The propulsion coefficients, thrust deduction factor, wake fraction and thrust and torque coefficients are usually defined in open water conditions and the open water coefficients are also often used in calculations in ice conditions. Propeller hull interaction has been studied relatively little in ice conditions especially when the ship is navigating backwards i.e. the propeller is working in front of the hull. The interest on the thrust coefficients has came up because of the double acting concept, where the ship navigates ahead in open water and in light ice conditions and astern in heavy ice conditions. The aim of this study was to clarify if the methods in defining the propeller coefficients in open water model tests are adaptable to be used in ice conditions and to define the magnitude of these coefficients in level ice and in brash ice channels. One main aim was also to clarify the affect of ice on the thrust deduction with an ice thrust deduction factor. This paper describes the conducted model tests, main results of the tests and propulsion coefficients calculated out of the test results. The thrust coefficients mentioned above were found out to be able to be defined in over load conditions but in ice conditions, the sensitivity of the coefficients on inaccuracies in measurements caused scatter.

• Record URL:
  http://www.poac.com/Papers/POAC03_V2.zip
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9788274820623
• Supplemental Notes:
  • Abstract reprinted with permission of the International Conference on Port and Ocean Engineering Under Arctic Conditions (POAC).
• Corporate Authors:

  Port and Ocean Engineering under Arctic Conditions (POAC)

  ,    
• Authors:
  • Leiviskä, T
• Conference:
  • 17th International Conference on Port and Ocean Engineering under Arctic Conditions (POAC'03)
  • Location: Trondheim , Norway
  • Date: 2003-6-16 to 2003-6-19
• Publication Date: 2003

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; References; Tables;
• Pagination: 12p
• Monograph Title: POAC '03: Proceedings of the 17th International Conference on Port and Ocean Engineering under Arctic Conditions
• Serial:
  • Proceedings of the International Conference on Port and Ocean Engineering Under Arctic Conditions
  • Publisher: Port and Ocean Engineering under Arctic Conditions (POAC)
  • ISSN: 0376-6756
  • EISSN: 2077-7841
  • Serial URL: http://www.poac.com/PapersOnline.html

Subject/Index Terms

• TRT Terms: Ice navigation; Propulsion; Ship pilotage; Thrust; Torque
• Subject Areas: Marine Transportation; Operations and Traffic Management; Vehicles and Equipment; I73: Traffic Control; I90: Vehicles;

Filing Info

• Accession Number: 01583447
• Record Type: Publication
• ISBN: 9788274820623
• Files: TRIS
• Created Date: Dec 23 2015 8:09AM