INTERFEROMETRIC OBSERVATION OF FLAME ACCELERATION IN AN EXPLOSIVE GAS

Abstract

Flash photographs of the transition from deflagration to detonation were obtained by means of the Mach-Zehnder interferometer. Experiments were performed using stoichiometric hydrogenoxygen mixtures in a 1.0 by 1.5 inch detonation tube with three methods of ignition: spark discharge, pilot flame, and glow coil. In all cases the ignitor was located at the closed end of the tube. For each set of operating conditions, a series of flash interferograms were taken, one on each experiment, which were pieced together on a single time-space plane to yield a cinematographic representation of the process. The individual interferograms revealed considerable information on the shape of the flame front and on the structure of the reaction zone, while the sequence of photographs yielded an insight into the breakdown of the combustion front from a laminar to a turbulent flame.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1962
Accession Number
AD0273684

Entities

People

  • A. J. Laderman
  • A. K. Oppenheim
  • P. A. Urtiew

Organizations

  • University of California, Berkeley

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Barium Titanates
  • Boundary Layer
  • Cameras
  • Ceramic Materials
  • Combustion
  • Combustion Products
  • Diagrams
  • Ignition
  • Light Sources
  • Measurement
  • Photographs
  • Photography
  • Refraction
  • Refractive Index
  • Spark Ignition
  • Spark Plugs

Fields of Study

  • Physics

Readers

  • Combustion and Flow Dynamics.
  • Optical Physics and Photonics.
  • Rocket Propulsion.

Technology Areas

  • Space
  • Space - Hall-Effect Thruster