A device for reducing the resistance of transom stern hulls
A novel idea to reduce the resistance of a transom stern hull in displacement and semi-planing modes is investigated. By placing a spoon-shaped device in the recirculating zone behind the transom, the momentum of the forward-moving water will be absorbed, and a pushing force generated on the device. Numerical and experimental techniques are applied on a transom stern hull to optimize the shape and position of the device and to explore in detail the physics behind the gain. For the towed hull at a Froude number of 0.4, the maximum measured resistance reduction is 11%, while the computed maximum reduction is 17%. In self-propulsion with one propeller, the measured power reduction is 15%. The power cannot be computed with the applied propeller model, which is an axial body-force distribution in the propeller disk, but the reduction in thrust using the device is 11%. More significant gains are possible at smaller Froude numbers, while the effect is reduced at higher Froude numbers. Larger gains are achieved by splitting the thrust on two propellers.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00298018
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Supplemental Notes:
- © 2021 The Authors. Published by Elsevier Ltd. Abstract reprinted with permission of Elsevier.
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Authors:
- Eslamdoost, Arash
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0000-0002-5395-919X
- Larsson, Lars
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0000-0003-2645-0539
- Brown, Matz
- Publication Date: 2021-9-1
Language
- English
Media Info
- Media Type: Web
- Features: Figures; References; Tables;
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Serial:
- Ocean Engineering
- Volume: 235
- Issue Number: 0
- Publisher: Pergamon
- ISSN: 0029-8018
- EISSN: 1873-5258
- Serial URL: http://www.sciencedirect.com/science/journal/00298018
Subject/Index Terms
- TRT Terms: Hulls; Ocean engineering; Propellers; Propulsion; Ships; Sterns; Wave resistance
- Subject Areas: Marine Transportation; Vehicles and Equipment;
Filing Info
- Accession Number: 01777117
- Record Type: Publication
- Files: TRIS
- Created Date: Jul 23 2021 3:25PM