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基于详细化学反应机理的燃烧数值模拟存在很大的困难:详细化学反应机理会导致化学反应流涉及到广泛的时间尺度;随着燃料所含碳原子数目的增加,其详细化学反应机理中所含的组分数目与基元化学反应数目会呈指数增长,这都直接导致计算量的急剧增加。本文基于乙烯氧化的详细化学反应机理,采用反应路径分析法得到简化机理,并模拟了不同条件下乙烯/空气的着火过程与火焰传播过程,验证了简化化学反应机理的可靠性。
Numerical simulations of combustion based on a detailed chemical reaction mechanism present significant difficulties: a detailed chemical reaction mechanism can lead to a wide range of time scales involved in the chemical reaction flow; as the number of carbon atoms in the fuel increases, the detailed chemical reaction mechanism The number of components and the number of chemical reactions in the base will show an exponential growth, which led directly to a sharp increase in the amount of computation. In this paper, based on the detailed chemical reaction mechanism of ethylene oxidation, the simplified mechanism was obtained by the method of reaction path analysis, and the ignition process and flame propagation process of ethylene / air under different conditions were simulated. The reliability of simplified chemical reaction mechanism was verified.