Jet Flames Stabilized by a Counter Air Stream

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This paper deals with the jet flames of rich propane-air mixtures in a counter air stream. At a constant jet nozzle pressure a stable combustion can be obtained within the appropriate ranges of the air-fuel ratio of the jets and the velocity of the counter air streams. In order to examine the fundamental characteristics of the flames, the behaviour of some typical flames within the stability curve is studied by means of visual observation and temperature and concentration measurements. A concept of similar flame based on the temperature profile at the maximum temperature section is introduced and confirmed experimentally. By using this concept a dimensionless flame stability curve can be obtained. The temperature, concentration and heat release rate profiles give a good explanation of the estimated relationship between the flame and flow pattern.
一般社団法人日本機械学会の論文