THE COANDA EFFECT AT DEFLECTION SURFACES WIDELY SEPARATED FROM THE JET NOZZLE

Abstract

The flow phenomenon in both liquids and gases of the adherence of a jet or jet sheet to a solid surface has been named the Coanda effect. The report discusses an experimental investigation, which shows that the Coanda effect is not limited to attached deflection surfaces or to inclined single or multiple flat-plate surfaces. The horizontally ejected subsonic and overchoked jet sheets successfully bridged horizontal and vertical gaps of 32 and 10 times the nominal jet sheet thickness (t = 1/16 inch) respectively; for t = 1/4 inch, the corresponding ratios were eight and two. The vertical gap was increased until the flow detached from the deflection surface. Vertical and horizontal forces acting on three different deflection surfaces were measured with a strain gauge balance. The configurations were tested at nominal pressure ratios of 1. 1, 1.2, 1.7, and 2.2, and the surface pressures were recorded.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1964
Accession Number
AD0610525

Entities

People

  • S. D. Benner

Organizations

  • University of Toronto

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Aircrafts
  • Barometric Pressure
  • Coanda Effect
  • Compressed Air
  • Compressible Flow
  • Equations
  • Leading Edges
  • Measurement
  • Pressure Distribution
  • Pressure Gradients
  • Static Pressure
  • Strain Gages
  • Test Facilities
  • Two Dimensional
  • United States
  • Universities

Readers

  • Aerodynamics/Aeronautics.
  • Combustion and Flow Dynamics.