Active Control of High Speed Jet Flames Using Counterflow

Abstract

Countercurrent flow control was applied as a novel flame stabilization technique on a premixed jet flame. In the experimental setup a converging nozzle burner was placed concentrically in a suction collar to generate suction driven countercurrent flow. Flame blow off velocity was measured at different suction velocity and equivalence ratio values. Tests show that by applying countercurrent flow around the periphery of a jet flame it can be stabilized up to jet exit velocity of 40 m/s. Particle Image Velocimetry (PIV) measurements and shadowgraph visualizations reveal that, application of suction changes the shear layer structure. An optical temperature measurement technique, refereed to as Laser Speckle Displacement (LSD) was developed for instantaneous temperature field measurements. It is shown that the technique is easy to implement and can be used in conjunction with PIV for simultaneous velocity and temperature measurements in reacting flows.

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Document Details

Document Type
Technical Report
Publication Date
Apr 24, 2003
Accession Number
ADA413063

Entities

People

  • Anjaneyulu Krothapalli
  • Esin Koc-alkislar
  • Luiz M. Lourenco

Organizations

  • Florida State University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Combustion
  • Computational Science
  • Flames
  • Flow
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Jet Flames
  • Laser Beams
  • Lasers
  • Measurement
  • Optics
  • Three Dimensional
  • Turbulent Mixing
  • Visualizations

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Fluid Dynamics.
  • Fluid Mechanics and Fluid Dynamics.

Technology Areas

  • Directed Energy