SUPERCAVITATING PROPELLERS, MOMENTUM THEORY

Abstract

Based entirely on momentum and other simple considerations a reasonably complete picture of the one dimensional pressure and velocity fields associated with heavily supercavitating propellers and drag discs was constructed. It is shown that the flow is very often retarded while approaching a heavily supercavitating propeller, so that the so-called ideal efficiency of such a propeller takes on values in excess of unity. The ideal efficiency actually increases with decreasing blade cavitational efficiency; however, the net efficiency at the same time decreases. This retardation causes a reduction of thrust deduction, or even a change in its sign. Charts are provided from which the inflow speed may readily be estimated. The effect of water tunnel boundaries are discussed, particularly the phenomena of choking.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1964
Accession Number
AD0611580

Entities

People

  • Marshall P. Tulin

Tags

Communities of Interest

  • Air Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Civil Engineering
  • Contracts
  • Control Surfaces
  • Fluid Dynamics
  • Hydrodynamics
  • Mechanics
  • Military Research
  • Model Basins
  • Navy
  • Propellers
  • Schools
  • Security
  • Ship Model Basins
  • Ship Models
  • Stratified Fluids
  • Supercavitating Propellers
  • Water Tunnels

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.
  • Systems Analysis and Design