Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (12): 3150-3156.doi: 10.3866/PKU.WHXB20101204

• THERMODYNAMICS,THERMOCHEMISTRY AND SOLUTION CHEMISTRY • Previous Articles     Next Articles

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

HOU Ling-Yun1, YANG Jin1, MA Xue-Song2, LIU Wei2   

  1. 1. School of Aerospace, Tsinghua University, Beijing 100084, P. R. China;
    2. Beijing Power Machinery Research Institute, Beijing 100074, P. R. China
  • Received:2010-05-10 Revised:2010-08-13 Published:2010-12-01
  • Contact: HOU Ling-Yun E-mail:lyhou@tsinghua.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50306011).

Abstract:

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.

Key words: Supersonic combustion, Chemical reaction mechanism, Vitiation air, Species

MSC2000: 

  • O643