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首页> 外文会议>US National Combustion Meeting >Rate-Ratio Asymptotic Analysis of the Influence of Addition of Hydrogen on the Structure and Mechanisms of Extinction of Nonpremixed Methane Flame
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Rate-Ratio Asymptotic Analysis of the Influence of Addition of Hydrogen on the Structure and Mechanisms of Extinction of Nonpremixed Methane Flame

机译：率比率渐近分析氢气对非增殖甲烷火焰灭绝结构的影响及机理

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摘要

Rate-ratio asymptotic analysis is carried out to elucidate the influence of hydrogen on the structure and mechanisms of extinction of methane flames in laminar nonpremixed flows. Steady, axisymmetric, laminar flow of two counterflowing streams toward a stagnation plane is considered. One stream, called the fuel stream, is made up of a mixture of methane, hydrogen, and nitrogen. The other stream, called the oxidizer stream is made up of a mixture of oxygen, and nitrogen. A reduced four-step chemical kinetic mechanism is employed. Chemical reactions are presumed to take place in a thin reaction zone that is established in the vicinity of the stagnation plane. On either side of this thin reaction zone, the flow field is inert. These inert regions are called the outer structure. The outer structure is analyzed first. It gives the matching conditions that is required in the analysis of the reaction zone. In the thin reaction zone chemical reactions are presumed to take place in two layers - an inner layer and an oxidation layer. In the inner layer methane is consumed and hydrogen and carbon monoxide are formed. In the oxidation layer oxygen, carbon monoxide and hydrogen are consumed. Critical conditions of extinction are predicted and are compared with experimental data and with results of numerical computation.
机译：进行率比率渐近分析，以阐明氢对层状非浸入流动甲烷火焰灭火结构和机制的影响。考虑稳定，轴对称，两个逆流朝向停滞平面的逆流流的层流。一种称为燃料流的流由甲烷，氢和氮的混合物组成。称为氧化剂流的另一个流由氧气和氮的混合物组成。采用减少的四步化学动力学机制。预测化学反应将在薄的反应区中进行，该反应区是在停滞平面附近建立的。在该薄反应区的两侧，流场是惰性的。这些惰性区域称为外部结构。首先分析外部结构。它给出了在反应区分析中所需的匹配条件。在薄的反应区中，预测化学反应将在两层 - 内层和氧化层中进行。在内层甲烷中被消耗，形成氢和一氧化碳。在氧化层氧中，消耗一氧化碳和氢气。预测临界灭绝条件，并与实验数据和数值计算结果进行比较。

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