A THEORY FOR THE PROPELLER-RUDDER INTERACTION

Abstract

The propeller-rudder interaction problem is studied by means of the unsteady lifting-surface theory. Both surfaces of arbitrary geometry are immersed in a nonuniform flowfield (i.e., hull wake) of an ideal incompressible fluid. The boundary-value problem yields a pair of surface integral equations, the inversion of which is achieved by the so-called 'generalized lift operator' technique, a new approach developed by the authors, in conjunction with the presently used 'mode-collocation' method. The analysis demonstrates the mechanism of the interaction phenomenon by exhibiting the filtering effects of the propeller on the harmonic constituents of the wake which allow the rudder to be exposed only to the blade harmonic and multiples thereof. A numerical procedure adaptable to the CDC 6600 computer was developed which furnishes information about (1) the steady and time-dependent pressure distribution on both lifting surfaces, and (2) the resultant hydrodynamic force and moments. A limited number of calculations exhibits the importance of some parameters such as axial clearance, number of blades, and harmonic components of the hull wake.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1968
Accession Number
AD0700944

Entities

People

  • M. R. Ali
  • S. Tsakonas
  • William Jacobs

Organizations

  • Stevens Institute of Technology

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aspect Ratio
  • Bending Moments
  • Coordinate Systems
  • Flow
  • Geometry
  • Hydrodynamics
  • Hydromechanics
  • Infinite Series
  • Integral Equations
  • Kernel Functions
  • Legendre Functions
  • Naval Architecture
  • Pressure Distribution
  • Propeller Blades
  • Steady State
  • Surfaces
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Calculus or Mathematical Analysis