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Convenient Laser Diagnostics for Aerodynamic and Chemical Study of Axisymetric Non Premixed Bluff-Body Burner Flames

  • A. Susset
  • K. Mokaddem
  • D. W. Kendrick
  • J. C. Rolon
  • D. Jaffre
  • D. Honore
  • M. Perrin
  • C. Gray
  • J. B. Richon
Conference paper

Abstract

This paper presents an experimental investigation of a turbulent, non premixed, methane/air flame, produced by an axisymetric Bluff-Body burner. Only a few experimental data exists on time and spatially resolved fuel concentration and velocity fields on such reacting flows, despite their interest for a better understanding of combustion processes, modelling and numerical calculations in turbulent combustion.

The aim of this work is to provide these experimental data by using instantaneous, multiple point and spatially resolved measurements of methane concentration images by planar Mie scattering technique, and instantaneous velocity fields by cross-correlated Particle Image Velocimetry (PIV).

Results of methane concentration imaging using several tracer particles are compared to those obtained elsewhere from probe measurements. The Teflon marker is revealed to be the more efficient methane tracer in flow as it is capable to follow the aerodynamic flow fluctuations and to characterize the zones corresponding to CH4 consumption in the flame by identifying the mean identical decomposition temperature of CH4 molecules and Teflon particles. In this work we show that Mie scattering on Teflon particles is an accurate tracer in both reactive and non reactive flows as it gives information on methane concentration and flame structure.

The PIV vector fields are related to that previously measured using Laser Doppler Velocimetry. Analysis of the fluctuating velocity components in the PIV measurements reveals differences with LDV results which are mainly caused by the limited spatial resolution of the PIV method. The exploitation of PIV specific information, i.e. the spatial correlation of measurements, makes it possible to quantitatively study the coherent structures present in the flow.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • A. Susset
    • 1
  • K. Mokaddem
    • 2
  • D. W. Kendrick
    • 2
  • J. C. Rolon
    • 2
  • D. Jaffre
    • 3
  • D. Honore
    • 3
  • M. Perrin
    • 3
  • C. Gray
    • 4
  • J. B. Richon
    • 4
  1. 1.Institut National des SciencesAppliquées de RouenMont Saint Aignan CedexFrance
  2. 2.Laboratoire EM2C — CNRS — EcoleCentrale de ParisFrance
  3. 3.Gaz de FranceResearch and Development Division, CERSTALa Plaine St DenisFrance
  4. 4.Optical Flow System Ltd.EdinburghScotland

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