Abstract
Blowoff data have been obtained for methane-air flames stabilized on the edge of a thin plate forming a common long side of twin rectangular slits. Good correlations of the data, using the concepts of critical boundary velocity gradient and Karlovitz flame stretch factor, are possible, but different correlations are obtained for each stabilization plate thickness. The values obtained with very thin plates probably approximate the true values most closely, and with these plates blowoff tends to occur at a constant value of flame stretch factor independent of mixture composition. The results thus provide additional support for the flame stretch theory of blowoff. It is suggested that twin-slit inverted flame burners with extremely thin stabilization plates should permit the accurate determination of critical values of Karlovitz flame stretch factor.
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