EFFECT OF GAS INJECTION IN SEPARATED SUPERSONIC FLOWS

Abstract

An experi ental investigation has been made at a Mach number of 2.21 on the effect of air injection in separated supersonic flows using two-dimensional backward facing step models. This effect, in a laminar flow, was found to be in- dependent of the particular technique of injecti n when the rate of injecti n was small. Air injection raises the base pressure and decrea es the pressure gradient at reattachment. At high rates of injection, considerable differences are found between the results obtained for various techniques of injection. It was also shown that the increase of the base-pressure is larger in the turbulent case than for a laminar boundarylayer. When freon gas was injected, it produced the opposite effect, namely of decreasing the base-pressure at low rates of injection. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1962
Accession Number
AD0274762

Entities

People

  • Jean J. Ginoux

Tags

DTIC Thesaurus Topics

  • Base Pressure
  • Flow
  • Laminar Flow
  • Mach Number
  • Pressure Gradients
  • Supersonic Flow
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Fluid Mechanics and Fluid Dynamics.
  • Snow Cover Descriptors for Reptiles and Their Illustrations.

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flow