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Article Dans Une Revue Flow, Turbulence and Combustion Année : 2012

Self-Turbulent Flame Speeds

Résumé

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
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Dates et versions

hal-01315949 , version 1 (13-05-2016)

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Joel Quinard, Geoff Searby, Bruno Denet, Jose Graña-Otero. Self-Turbulent Flame Speeds. Flow, Turbulence and Combustion, 2012, 89 (2), pp.231-247. ⟨10.1007/s10494-011-9350-3⟩. ⟨hal-01315949⟩
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