Abstract
AbstractAn experimental investigation of premixed propane-air flames propagating in long, narrow tubes open at both ends was performed in order to establish flame phenomenology and make comparisons to theoretical predictions. Fuel-air equivalence ratios of 0.8, 1.0, 1.2, and 1.4 were studied, and the effect of tube length was investigated using lengths of 59.1 and 104 cm. Quantitative comparisons to theoretical studies provided support to the hypothesis that a pressure gradient is established in the tube because of the Poiseuille flow induced in the gas by the flame, leading to flow away from the flame in both directions. Several regimes of propagation were established, including initial smooth propagation at constant speed, regions of high-amplitude oscillation accompanied by flame acceleration, and regions of small-amplitude oscillation during which the mean propagation speed was nearly uniform. The most intense flame oscillations and consequent acceleration occurred in mixtures with equivalence ratios ...
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