Abstract
In this study, the onset of flame acceleration because of Darrieus–Landau and diffusive–thermal instability in propane–oxygen mixtures was investigated using experiments and analysis. Using the soap bubble method, the unstretched laminar burning velocity Su0 and critical flame radius rc at which flame acceleration occurs of the propane-oxygen mixture were evaluated. The experimental values of Su0 and critical Péclet number Pec agreed qualitatively with the calculated values, and Pec tended to decrease with increasing equivalence ratios. In addition, the dependency of Pec on the Markstein number Mab and the critical Karlovitz number Kac on Mab for the propane–oxygen flame was compared with that for other fuel–air mixtures. The comparison revealed that the decreasing trend of Kac with Mab for the propane-oxygen flame was qualitative consistent with other fuel-air mixtures, in contrast to the different slopes of the Pec-Mab relationship.
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