Premixed flames, where fuel and oxidizer are mixed prior to combustion, are widely used, for example in gas turbines or internal combustion engines like vehicle gasoline engines, as they give a practical mean to control the rate of combustion and pollutant formation. However, thermal and hydrodynamical effects distort the global flame front, which presents a collection of cells, separated by cusps, merging and birthing at random, and having a broad distribution of sizes.
Thanks to an original experimental facility that allows quantitative imaging, the shape and dynamics of these flames propagating between two glass plates separated by a thin gap of 5mm in width is analyzed. We study both the formation and merging of the cells to understand the steady statistical features of the front, features which sets its propagation speed and may influence the formation of pollutants.
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