Study of Twin- and Triple-Screw Systems for Icebreakers

Abstract

A parametric study of twin and triple-screw propulsion systems for large icebreakers is conducted with respect to technical properties and feasibility limits. The study is devoted to the following aspects in particular: Bollard thrust, ahead, conventional propeller; Bollard thrust, astern, conventional propeller; Bollard thrust ahead and astern, special compromise propeller, designed for astern operation; Propulsive efficiency at advance speed of 1 knot; Propulsive efficiency, free running at 18 knots; Radial and axial clearances between propellers and hull; Steering and maneuverability; Propeller excited hull and shaft vibrations; Propeller strength; Cavitation--further, the effect of the following parameters had to be considered: Blade number, three versus four blades; Hub size, solid and detachable blade screws; Propeller diameter; Area and power splitting ration, 1:1:1 versus 1:2:; Powering (SHP).

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1966
Accession Number
AD0849061

Entities

People

  • Harjit S. Chopra
  • Horst Nowacki
  • Jacob Arbel

Organizations

  • University of Michigan

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Coast Guard
  • Department Of Veterans Affairs
  • Equations
  • Marine Engineering
  • Molecular Dynamics
  • Naval Architecture
  • Propeller Blades
  • Propellers
  • Propulsion Systems
  • Rdx
  • Reliability
  • Screws
  • Shape
  • Test And Evaluation
  • Thrust
  • Trailing Edges
  • Vibration

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Marine Hydrodynamics