Dynamic Wake Identification for Model- and Full-Scale Container Ship

Mogens Blanke, Rasmus Steffensen

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Abstract

Propeller performance prediction is traditionally based on open water calm model basin tests. In waves, and during vessel manoeuvring, inflow to the propeller changes significantly, i.e. the shape of the wake field will change and propeller load and efficiency are impacted. This paper focus on the changes in wake fraction that can be identified in dynamic conditions. The effects on wake fraction of ship maneuvering and the effects of waves’ orbital velocity are investigated from experimental data. Model basin tests with a free sailing container ship model provide data for identification of propeller load and mean wake fraction during manoeuvring and during passage of waves. The results are verified with analysis during maneuvering in calm sea with a scale model and with the full-scale version of a 45.000 m3 container ship. Experimental results show the wake fraction variation during maneuvering, and estimates of wake fraction derivatives are found with respect to the relative sway velocity at the propeller. The contribution of the paper is to provide evidence for the magnitude of propeller shaft loads that can be expected during passage in a seaway and during manoeuvring.
Original languageEnglish
Book seriesIFAC-PapersOnLine
Volume55
Issue number31
Pages (from-to)463-469
ISSN2405-8963
DOIs
Publication statusPublished - 2022
Event14th IFAC Conference on Control Applications in Marine Systems, Robotics and Vehicles - Technical University of Denmark, Kongens Lyngby, Denmark
Duration: 14 Sept 202216 Sept 2022
https://www.ifac-cams2022.dk/

Conference

Conference14th IFAC Conference on Control Applications in Marine Systems, Robotics and Vehicles
LocationTechnical University of Denmark
Country/TerritoryDenmark
CityKongens Lyngby
Period14/09/202216/09/2022
Internet address

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