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Role of H_2/CO Addition to Flame Instabilities and Their Control in a Stepped Microcombustor

机译：Role of H_2/CO Addition to Flame Instabilities and Their Control in a Stepped Microcombustor

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摘要

The effect of H-2/CO addition on flame dynamics of propane-air mixtures in a stepped microcombustor with heat recirculation was investigated experimentally. Unstable flame propagation regimes and their transition modes were observed for a range of mixture velocities (5-8 m/s) and equivalence ratios (0.6-0.95). Up to 60 H-2 addition to lean propane-air mixtures helps improve the flame stability range in the combustor. The suppression of these flame instabilities with H-2 addition is attributed to the increase in the overall mixture reactivity and burning velocity. The enhancement in OH intensity with H-2 addition indicated a change in the elementary reactions, thereby affecting the flame dynamics. Contrary to H-2 addition, CO addition does not show any noticeable effect on the formation of stable flame modes. The change in mixture properties and burning velocity leads to a change in the flame behavior and alters the heat release rate due to H-2 addition to propane-air mixtures. A higher percentage of H-2 addition led to the reappearance of the unstable (rotating) flames in the microcombustor. Intrinsic flame instabilities appeared at higher H-2 percentages due to differential diffusion and increased thermal-wall coupling effects.

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