Flame propagation experiments in confined geometries reveals extensive insights for the fundamental understanding of combustion phenomena, the characterization of fuel properties, and addressing practical challenges in micro-scale combustion systems. A flame propagation experiment in an open-closed combustion tube shows the premixed flame behavior and response to self-excited thermoacoustic instabilities. At sufficiently high acoustic fluctuation amplitudes, a planar flame spontaneously forms cellular flames that oscillate twice the period of the acoustic standing due to self-induced parametric excitation. This transition from a planar flame to cellular flame caused by acoustic acceleration leads to a violent turbulence. By studying the cellular flame structures at the onset of parametric instability, the influence of flame stretch and curvature on flame stability can be quantified.Credits: Bush Week - Nihilore, https://www.nihilore.com/synthwave (Creative Commons Music)
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