PROPELLER VORTEX CAVITATION INCEPTION STUDIES

Abstract

Three TMB propellers were tested to determine the effect of pitch distribution on hub cavitation inception. Three fairwaters of varying geometry were also evaluated for their effect on inception of this type of cavitation. Observation of inception speeds on tip-vortex cavitation were also made. The propellers tested in the 24-inch variable pressure water tunnel were TMB Propellers No's. 2963, 2964, and 2965. Fairwater geometries evaluated were 5 deg diverging and 5 deg converging truncated cones, and a conventional ogive configuration. The tests were performed at several cavitation indices over a range of speed coefficients. It was found that reduction of the pitch at the tip delayed tip vortex cavitation inception, whereas inception at the hub occurred earlier. Hub-vortex cavitation inception was delayed the most when the 5 deg diverging conical fairwater was used.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1963
Accession Number
AD0404864

Entities

People

  • John M. Coon

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Blades
  • Cavitation
  • Coefficients
  • Diameters
  • Fluid Dynamics
  • Geometry
  • Marine Propellers
  • Observation
  • Photographs
  • Physics Laboratories
  • Propeller Blades
  • Propellers
  • Reynolds Number
  • Test Facilities
  • Tunnels
  • Variable Pressure
  • Water Tunnels

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Marine Hydrodynamics
  • Marine Propulsion Engineering and Naval Architecture