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 shu

Effects of Species in Vitiation Air on Methane-Fueled Supersonic Combustion

1.
1. School of Aerospace, Tsinghua University, Beijing 100084, P. R. China;
2. Beijing Power Machinery Research Institute, Beijing 100074, P. R. China

Received Date: 10 May 2010
Available Online: 26 October 2010
Fund Project: 国家自然科学基金(50306011)资助项目 (50306011)

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.
- Supersonic combustion,
- Chemical reaction mechanism,
- Vitiation air,
- Species
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