不活性ガスとの間の対向流伸長予混合火炎の消炎

概要

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Extinction characteristics of stretched flames established in a stagnation-point flow between premixed mixtures and inert gases have been experimentally investigated. The extinction limit was mapped as a function of fuel concentration and mixture velocity, and the flame location and the maximum flame temperature at the extinction limit have been measured. Methane and propane are used as fuels, and nitrogen, argon, carbon dioxide, and helium are used as inert gases. Results show that the flammable range becomes narrower than that of the adiabatic twin flame, especially for rich-propane flames. The flames are extinguished close to the stagnation surface for the lean methane/air mixture and rich-propane/air mixture, but the flames are extinguished at some distance from the stagnation surface for the rich methane/air mixture and lean propane/air mixture. Such flame behavior at the extinction limit is similar to that of the adiabatic twin flame. The flame temperature at the extinction limit is almost the same for the flames which are extinguished close to the stagnation surface, but different for the flames which are extinguished at a finite distance from the stagnation surface. The flame which is extinguished at a finite distance from the stagnation surface is insensitive to the nature of the stagnation surface.
社団法人日本機械学会の論文
1994-03-25