Upstream Islands of Flame in Lifted-Jets Partially Premixed Combustion

Abstract

Contemporary interest exists in understanding the roles of leading edge flow deflection, secondary jet instabilities and islands of ignited gases in permitting lifted flames to stabilize. To assess these issues, elements of the leading-edge of a lifted turbulent jet flame have been investigated using laser-imaging techniques. Images of flame position, morphology and dynamics are presented primarily from CH planar laser-induced fluorescence (CH-PLIF) measurements. In particular, evidence of flame islands, or flame fragments, upstream of the bulkflame leading edge are reported and discussed. This evidence is presented in the form of sequential CH-PLIF images and well as CH-PLIF=Rayleigh scattering images. Images showing thermal characteristics of the regions surrounding the edge flame are also described.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2007
Accession Number
ADA486369

Entities

People

  • C. D. Carter
  • Jeffrey M. Donbar
  • K. A. Watson
  • K. M. Lyons

Organizations

  • North Carolina State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Air Force Facilities
  • Air Force Research Laboratories
  • Chemical Reactions
  • Combustion
  • Diffusion
  • Flame Propagation
  • Flames
  • Fluorescence
  • High Temperature
  • Jet Flames
  • Laser Induced Fluorescence
  • Lasers
  • Leading Edges
  • Military Research
  • North Carolina
  • Rayleigh Scattering

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Mechanics and Fluid Dynamics.
  • Urban Planning and Geography.

Technology Areas

  • Directed Energy