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Self-Turbulent Flame Speeds

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Abstract

This paper reports an experimental investigation of premixed propane and methane-air flames propagating freely in tubes 1.5 m long and with diameters ranging from 26 to 141 mm. The thermo-acoustic instability was eliminated by means of a novel acoustic absorber placed at the closed end of the tube. We first remark that the flame can adopt different shapes either quasi-axisymmetric and normal to the mean direction of propagation, or inclined with a larger propagation speed because of the increase in flame surface area. The minima of the propagation speeds, corresponding to non-tilted flame propagation, are then analyzed using analytical models for the self-turbulent flame propagation. The concept of a cut-off wavelength appears to be relevant to explain the different behaviors observed on the rich side of methane-air and propane-air flames.

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Authors and Affiliations

  1. CNRS and Aix-Marseille Université, Marseille, France

    Joel Quinard, Geoff Searby & Bruno Denet

  2. Thermodynamics Departement, ETSI Aeronauticos, Universidad Politécnica de Madrid, Madrid, Spain

    Jose Graña-Otero

Authors
  1. Joel Quinard
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  2. Geoff Searby
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  3. Bruno Denet
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  4. Jose Graña-Otero
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Correspondence to Joel Quinard.

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Quinard, J., Searby, G., Denet, B. et al. Self-Turbulent Flame Speeds. Flow Turbulence Combust 89, 231–247 (2012). https://doi.org/10.1007/s10494-011-9350-3

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  • DOI: https://doi.org/10.1007/s10494-011-9350-3

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