Propeller Wake Flow Visualization Near a Free Surface.

Abstract

Propeller wake flow visualization was carried out for several depths of submergence below a free surface. The wake was visualized by laser light sheet illumination of the blade tip vortex helix seeded with fluorescein dye. Instability in the helix was apparent at much shorter distances downstream than has previously been observed in cavitation experiments. Effects of the free surface on the propeller wake were seen at the shallower submergence depths. Select video frames are presented with preliminary comments. A more complete analysis will follow ina later report. Keywords: Marine propeller wake; Vortex helices; Propeller blades; Flow visualization. (edc)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1988
Accession Number
ADA195879

Entities

People

  • James N. Blanton
  • Scott Fish

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Blade Tips
  • Blades
  • Classification
  • Depth
  • Dyes
  • Flow
  • Flow Visualization
  • Instability
  • Lasers
  • Photographs
  • Propellers
  • Security
  • Shallow Depth
  • Video
  • Video Frames
  • Video Recording
  • Visualizations

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Marine Hydrodynamics

Technology Areas

  • Directed Energy