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Extinction limits of nonadiabatic, catalyst-assisted flames in stagnation-point flow

机译：驻点流中非绝热催化剂辅助火焰的消光极限

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摘要

An idealized geometry corresponding to a premixed flame in stagnation-point flow is used to investigate the effects of catalysis on extending the extinction limits of nonadiabatic stretched flames. Specifically, a surface catalytic reaction is assumed to occur on the stagnation plane, thereby augmenting combustion in the bulk gas with an exothermic surface reaction characterized by a reduced activation energy. Assuming the activation energies remain large, an asymptotic analysis of the resulting flame structure yields a formula for the extinction limit as a function of various parameters. In particular, it is demonstrated that the presence of a surface catalyst can extend the burning regime, thus counterbalancing the effects of heat loss and flame stretch that tend to shrink it. The analysis is relevant to small-volume combustors, where the increased surface-to-volume ratio can lead to extinction of the nonadiabatic flame in the absence of a catalyst.
机译：一个理想的几何形状对应于驻点流中的预混火焰，用于研究催化作用对扩展非绝热拉伸火焰的消光极限的影响。具体地，假定在停滞面上发生表面催化反应，从而通过特征在于活化能降低的放热表面反应增强了本体气体中的燃烧。假设活化能仍然很大，则对所得火焰结构进行渐近分析，得出消光极限的公式，该公式是各种参数的函数。特别地，已经证明表面催化剂的存在可以延长燃烧状态，从而平衡了热收缩和火焰收缩的效果，而热损失和火焰拉伸往往使表面收缩。该分析与小体积燃烧器有关，在没有催化剂的情况下，增加的表面体积比可能导致非绝热火焰熄灭。

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