Self-Turbulent Flame Speeds |
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Authors: | Joel Quinard Geoff Searby Bruno Denet Jose Gra?a-Otero |
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Institution: | 1. CNRS and Aix-Marseille Universit??, Marseille, France 2. Thermodynamics Departement, ETSI Aeronauticos, Universidad Polit??cnica de Madrid, Madrid, Spain
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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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