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通过耦合计算流体力学软件FLUENT和化学反应动力学软件CHEMKIN并采用空间气相和表面催化详细化学反应机理,对氢气和空气的预混合气体在微型管道内的催化燃烧过程进行了数值模拟,讨论了不同反应模型的燃烧特性以及当量比Φ和预混合气体入口速度对催化燃烧反应的影响。计算结果表明:表面催化反应对空间气相反应有抑制作用;当量比Φ对氢气的催化燃烧过程有重要影响;随着入口速度的增大,燃烧过程同时存在表面催化反应和空间气相反应两种控制因素;表面催化反应对空间气相反应的影响能被分成3种类型。计算结果为在微型动力系统中实现催化燃烧以及扩展燃烧极限提供了理论依据。
By coupling computational fluid dynamics software FLUENT and chemical reaction kinetics software CHEMKIN and adopting the detailed chemical reaction mechanism of space gas phase and surface catalysis, the catalytic combustion process of hydrogen and air pre-mixed gas in micro-pipe was numerically simulated, The combustion characteristics of the reaction model and the effect of equivalence ratio Φ and premix gas inlet velocity on the catalytic combustion reaction. The results show that the catalytic reaction on the surface can inhibit the gas-phase reaction in space. The equivalence ratio Φ has an important influence on the catalytic combustion of hydrogen. With the increase of the inlet velocity, both the surface catalytic reaction and the space gas-phase reaction Factors; The influence of surface catalysis on the space gas phase reaction can be divided into three types. The results provide a theoretical basis for achieving catalytic combustion and extending the combustion limit in a micro-power system.