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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