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An investigation into the effect on ship manoeuvring of a pre-swirl duct
Citation Link: https://doi.org/10.15480/882.9365
Publikationstyp
Conference Paper
Date Issued
2024-04-04
Sprache
English
Author(s)
IBMV Maritime Innovationsgesellschaft mbH (ibmv), Rostock, Germany
Ship Model Basin Potsdam (SVA), Potsdam, Germany
TORE-DOI
Start Page
589
End Page
598
Citation
8th International Symposium on Marine Propulsors (smp 2024)
Contribution to Conference
Publisher
Norwegian University of Science and Technology, Department of Marine Technology
ISBN
978-82-691120-5-4
Peer Reviewed
true
To date, pre-swirl ducts (PSDs) have been developed primarily from the viewpoint of improving propulsion efficiency. Such devices tend to add a substantial wetted surface area at the aft end of a vessel, but little is known on how this affects a vessel’s overall manoeuvring qualities. Becker Marine Systems (BMS), ibmv, SVA Potsdam and the Technische Universität Hamburg-Harburg (TUHH) have therefore initiated a joint research project to further investigate the influence of PSDs on the manoeuvring abilities of ships. The work has been focused on two key aspects. Firstly, the complex interaction between ship, PSD, propeller and rudder was studied via numerical simulations correlated against extensive wind tests for various configurations of propeller, rudder and PSD and different drift angles. Secondly, manoeuvring investigations were carried out to determine the influence of PSDs on the key manoeuvring parameters. This included testing in both the towing tank and free-running tests on a lake, with comparisons made against equivalent CFD simulations. To enable reasonable computation time the manoeuvring CFD simulations used a body-force propeller model. The measurement campaign encompassed turning circles, zig-zag tests (10°/10° and 20°/20°) as well as spiral manoeuvres, with and without various PSDs fitted. For this work the JBC model was selected.
The investigations show that the PSD only marginally influences the manoeuvring behaviour of full-form ships. The JBC hull is slightly unstable with respect to yaw. The yaw instability is primarily related to flow separation in the aft part of the ship above the propeller. In this case, PSDs are not able to impose significant changes to the unstable region.
The investigations show that the PSD only marginally influences the manoeuvring behaviour of full-form ships. The JBC hull is slightly unstable with respect to yaw. The yaw instability is primarily related to flow separation in the aft part of the ship above the propeller. In this case, PSDs are not able to impose significant changes to the unstable region.
Subjects
Energy-saving devices (ESD)
Pre-swirl ducts (PSD)
Manoeuvring
CFD
yaw instability
DDC Class
620: Engineering
Publication version
publishedVersion
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Leonard-AnInvestigationIntoTheEffectOnShipManoeuvringOfAPreswirlDuct-1192-1-final.pdf
Type
Main Article
Size
1.78 MB
Format
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