FORMATION OF THE GAS FLOW BEFORE THE FLAME FRONT,

Abstract

A study was made of the deflagration to detonation transition in hydrogen-oxygen mixtures using high-speed photography (94,000 frames/sec). Data were obtained on the gas flow in the quiescent medium before the flame front by introducing artificial optical inhomogeneities into the quiescent gas mixture, and then photographing their traces. These traces were then transformed into distance vs time diagrams. Plots of the flame speed vs time were also obtained. A comparison of the experimental data with data calculated by the method of characteristics showed that the state of the gas before the flame front can be calculated by this method. It was also shown that when the flame front moves with accelerated motion, the gas velocity, density, and pressure attain their maximums very close in front of the flame front. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 14, 1967
Accession Number
AD0677254

Entities

People

  • G. D. Salamandra

Organizations

  • National Air and Space Intelligence Center

Tags

DTIC Thesaurus Topics

  • Cameras
  • Deflagration
  • Detonations
  • Dynamics
  • Experimental Data
  • Flow
  • Gas Dynamics
  • Gas Flow
  • High Speed Photography
  • Hydrogen
  • Images
  • Method Of Characteristics
  • Optical Equipment
  • Photographic Equipment
  • Photographic Materials
  • Photographic Recording Media
  • Photography

Fields of Study

  • Physics

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Combustion and Flow Dynamics.