The Wake Velocity and Rudder Force on a Tanker Ship Model.

Abstract

A propeller tunnel had been fitted to a 33,000 t (32,500 ton) bulk carrier to cure cavitation, vibration and noise problems occurring previously. However, the ship's masters reported that the propeller tunnel had reduced manoeuverability especially when operating at low speed in shallow water. From a series of wind tunnel tests with a model, a set of vortex generators was developed which improved the flow over the stern and increased the side force produced by the rudder. It is anticipated that fitting corresponding generators to the ship, together with the propeller tunnel and a 0.3 m (1 ft) extension to the rudder, will improve the manoeuverability compared with the original hull, when the rudder is set at an angle greater than 25 deg with a 0.9 m (3 ft) underkeel clearance, and greater than 12 deg in a deep sea. (Author)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1978
Accession Number
ADA062572

Entities

People

  • N. Matheson

Tags

DTIC Thesaurus Topics

  • Cavitation
  • Clearances
  • Flow
  • Generators
  • Models
  • Propellers
  • Shallow Water
  • Ship Models
  • Ships
  • Tanker Ships
  • Vibration
  • Vortex Generators
  • Vortices
  • Wind Tunnel Tests
  • Wind Tunnels

Readers

  • Marine Hydrodynamics