The Influence of Wake Pattern on the Rudder Force of a Ship Model in a Deep Sea,

Abstract

The results of wind tunnel tests are given which were aimed at overcoming a steering problem on a 33000 tonne bulk carrier. The ship, as originally built, suffered from vibration and cavitation problems caused by the propeller working in non-uniform flow. A propeller tunnel had been fitted which satisfactorily overcame these problems, but it made the ship much less manoeuvrable, especially at low speed in shallow water. It was considered that vortex generators could offer an alternative to the propeller tunnel for improving the flow into the propeller without introducing any adverse affects on the steering. Several vortex generator sets were evolved which increased the sideforce produced by the rudder, by up to 44%, but none of them produced an equal or more uniform velocity distribution of the flow into the propeller compared with the tunnel. Since the most important requirement was to eliminate vibration and cavitation, it was concluded that the propeller tunnel could not be replaced by vortex generators. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1979
Accession Number
ADA079955

Entities

People

  • N. Matheson

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Cavitation
  • Engineering
  • Engineers
  • Flow
  • Fluid Flow
  • Fluids
  • Generators
  • Naval Architecture
  • Propeller Shafts
  • Propellers
  • Shallow Water
  • Ship Models
  • Vortex Generators
  • Water
  • Wind Tunnel Tests
  • Wind Tunnels

Readers

  • Aerodynamics.
  • Aerodynamics/Aeronautics.
  • Systems Analysis and Design