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.

• Record URL:
  https://doi.org/10.1016/j.oceaneng.2021.109351
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S0029801821007678
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00298018
• Supplemental Notes:
  • © 2021 The Authors. Published by Elsevier Ltd. Abstract reprinted with permission of Elsevier.
• Authors:
  • Eslamdoost, Arash
  • 0000-0002-5395-919X
  • Larsson, Lars
  • 0000-0003-2645-0539
  • Brown, Matz
• Publication Date: 2021-9-1

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• 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