Flame quenching by a cold wall

✍ Scribed by Jósef Jarosiński

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 526 KB
• Volume: 50
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(83)90059-7

✦ Synopsis

Quenching of upward and downward propagating flames in narrow channels is studied. The speed and the instantaneous flame temperature were measured and Schlieren photography was used in experiments. The experiments were carried out in a vertical 50 x 50---mm 2 tube I m long, with channels. Flame characteristics of methane-air mixtures were determined over the entire burning range. The results of the experiments showed that the channel quenching distance is, over the entire range of mixture composition, twice as wide as the flame thickness. These conditions are equivalent to the Peclet number Pe = uD/a = 39, where u and D, determined empirically, are the burning velocity and the quenching distance, respectively, and a is the thermal diffusivity of the unburned mixture. The appropriate Peclet number determined earlier for tubes was Pe = 46 (Putnam and Jensen, Third Symposium on Combustion, 1949. p. 89).