Abstract
Ionization probes were used to obtain time-dependent information on the transition regionof propane-air jet flames stabilized on a 25.4 mm diameter burner. Processing of the fluctuating ionization signal, which characterizes very closely the flame location and movement, provided statistical information on the flame geometry. The results confirmed the description of the flame as beginning near the burner with a laminar, steady surface where instabilities develop which lead to the formation, further downstream, of an ensemble of flamelets. Gas sampling and analysis for CO, CO 2 and O 2 gave basic mean composition data. A progress variable was used for reducing these results and is shown to be also useful, although not so effective, for reducing the mean ionization data.
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