Ship powering prediction from self-propulsion load varying tests
conference contribution
posted on 2023-05-23, 16:48authored byMolloy, S, Neil Bose
A method is presented for predicting full-scale ship powering performance from model load-varying test data. The method follows the recommendations for powering prediction of the Specialist Committee on Unconventional Propulsors of the 22nd IITC: specifically, that ship models fitted with unconventional propulsors should be tested as a unit and not broken down into component tests of hull, propulsor, rotor and stator components, and that extrapolation of full scale powering should be done using self propulsion load varying tests of the geometrically similar ship model and geometrically similar propulsor. Values of a form factor, a resistance and a thrust deduction fraction are found from an analysis of the under/overload tests. The full scale torque and thrust coefficients are estimated from the model propeller data in the behind condition. Results are presented for a conventional twin screw icebreaker for which self-propulsion data and full scale trials results were available. Comparisons are made between the results and an extrapolation done using the IITC 1978 method. The effects of using different friction lines are discussed and included in the analysis. A discussion of the choice of appropriate correlation coefficients is included.
History
Publication title
SP2001, Lavrentiev Lectures [possibly not a conference publication????]
Editors
[refereed? can't find information to justify F1]
Pagination
133-142
Department/School
Australian Maritime College
Publisher
St. Petersburg State Marine Technical University
Place of publication
Russia
Event title
SP2001, Lavrentiev Lectures
Event Venue
St. Petersburg, Russia
Date of Event (Start Date)
2001-06-19
Date of Event (End Date)
2001-06-21
Repository Status
Restricted
Socio-economic Objectives
Oceanic processes (excl. in the Antarctic and Southern Ocean)