【摘要】 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预混合气体入口速度、当量比Φ和管径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;随着入口速度的增大,燃烧过程同时存在着表面催化反应和空间气相反应两种控制因素;当量比Φ和管径对氢气的催化燃烧过程有重要的影响。更多还原

【Abstract】 Catalytic combustion of hydrogen/air mixture inside micro-tubes was numerically investigated by using the commercial fluid dynamics code FLUENT coupled with the chemical reaction dynamics subroutine CHEMKIN and detailed chemical reaction mechanisms.Combustion characteristics for different reaction models and the influence of inlet velocity,equivalence ratio of hydrogen /air in mixture and tube diameter on surface catalytic combustion reaction were discussed.Computational results indicate that the surface catalytic combustion restrains the gas phase combustion.As the inlet velocity increases,the existence of the surface catalytic combustion and the gas phase combustion has two controlling factors on combustion.Equivalence ratio of hydrogen /air in mixture and tube diameter have important influence on catalytic combustion of hydrogen.更多还原