Citation:
HOU Ling-Yun, YANG Jin, MA Xue-Song, LIU Wei. Effects of Species in Vitiation Air on Methane-Fueled Supersonic Combustion[J]. Acta Physico-Chimica Sinica,
;2010, 26(12): 3150-3156.
doi:
10.3866/PKU.WHXB20101204
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Based on a detailed chemical reaction mechanism, a reduced reaction mechanism with 18 species and 24 steps was used to simulate the supersonic combustion of methane. Heated air calculations showed that seven main vitiated species, i.e., H2O, CO2, O, OH, CO, H, and H2, were present in ethanolfueled heated air. We analyzed the effects of these species on methane-fueled supersonic combustion using chemical kinetics and thermodynamics. H2O inhibits the combustion process, decreases the combustion efficiency, and decreases the specific thrust. The relatively large molecular weight of CO2 contributes to an increase in the mean molecular weight of the fuel gas, which is a negative factor in the mechanism of specific thrust. Free radicals O, OH, H can effectively promote the combustion process and thus increase the combustion efficiency. Intermediate products CO and H2 increase the combustion efficiency, and this is a function of the additional fuel.
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