Mesoscale Flames Exhibit Distinct Dynamical Regimes

A Feb 23, 2026 preprint by Akhil Aravind systematically examines flame regimes in a 5 mm quartz tube mesoscale combustor using premixed methane-air mixtures. Researchers recorded instantaneous OH* chemiluminescence, acoustic pressure, and high-speed imaging; applied recurrence quantification and spectral analyses, continuous wavelet transforms and phase plots; and trained a stacking-ensemble classifier to discriminate stable, repetitive extinction-ignition, and propagating regimes.