Flow Separation, Reattachment, and Ventilation of Foils with Sharp Leading Edge at Low Reynolds Number

Abstract

Two two-dimensional foils (a wedge and a modified Tulin two-term foil) were used to study the ventilation of foils with sharp leading edges at low Reynolds number. Flow visualization by dye injection techniques and by tufts was used to determine the reattachment point of the separated streamline in nonventilated flow. The results indicate that if air is forced into a separated region, it is possible to achieve a fully developed cavity. This can be accomplished at speeds too low for any cavitation to occur by resorting to relatively high angles of attack. Hence, it is possible to go directly from noncavitating flow to fully developed cavity flow. Results of pressure measurements over the surface of the curved foil are included.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1974
Accession Number
AD0787500

Entities

People

  • Goodwin Ober
  • Richard Hecker

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Air Pressure
  • Air Supplies
  • Buoyancy
  • Cavitation
  • Flow
  • Flow Separation
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Mechanics
  • Geometry
  • Leading Edges
  • Measurement
  • Physics Laboratories
  • Pressure Measurement
  • Reynolds Number
  • Test And Evaluation
  • Test Equipment

Fields of Study

  • Physics

Readers

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