Citation: SHAO Ju-Xiang, TAN Ning-Xin, LIU Wei-Xiong, LI Xiang-Yuan. Influence of H2O and CO2 in Air on the Combustion of Ethylene (II)——Reaction Mechanismand Kinetics Simulation[J]. Acta Physico-Chimica Sinica, 2010, 26(02): 270-276. doi: 10.3866/PKU.WHXB20100140
空气污染组分H2O和CO2对乙烯燃烧性能的影响(II)——反应机理和动力学模拟
超燃冲压发动机在高空工作时, 以高温高速纯净空气作氧化剂使燃料燃烧. 但在地面实验中, 高温空气往往通过燃烧加热方式获得, 会使空气中含有H2O和CO2等污染组分. 本文用活塞流反应器进行动力学模拟, 研究在不同初温、压强和燃气比的条件下, H2O和CO2污染组分对乙烯燃烧的温度、压强和点火延迟时间等特性的影响. 模拟结果表明: 乙烯在含有H2O/CO2污染物的空气中燃烧, 相比纯净的空气而言, H2O对乙烯的点火有一定的促进作用, 而CO2有一定的抑制作用; 空气中含H2O和CO2污染物使乙烯燃烧的平衡温度和压强降低, 在污染物浓度相同时, CO2引起的下降幅度比H2O的大. 模拟结果能较好地解释现有的实验现象.
English
Influence of H2O and CO2 in Air on the Combustion of Ethylene (II)——Reaction Mechanismand Kinetics Simulation
Clean air at high temperature and velocity is used as the oxidant during fuel combustion in a hypersonic scramjet. In ground tests, however, the high-temperature air produced by combustion heating contains H2O and CO2 as contaminants. In this study, the influence of H2O and CO2 in air upon the equilibrium temperature and pressure, and the ignition delay time for ethylene combustion were investigated by a kinetics simulation method using a plug flow reactor. Different initial temperatures, pressures, and equivalence ratios were studied. We find that the presence of H2O promotes combustion whereas CO2 inhibits combustion. Both H2O and CO2 result in a decrease of the equilibrium temperature and pressure during ethylene combustion, and CO2 has a comparatively larger influence than H2O. The simulated result was used to interpret the experimental phenomena.
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Key words:
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Kinetics simulation
- / Plug flow reactor
- / Combustion of ethylene
- / Contaminant
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