摘要
根据空间气相和表面催化详细化学反应机理,应用耦合计算流体力学软件Fluent和化学反应动力学软件Chemkin,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数值模拟,并讨论不同反应模型的燃烧特性以及导热壁、管壁材料(Pt,Si和Al)、预混合气体入口速度和当量比等因素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;在微型管道内,通过导热壁轴向间的传热,预热入口混合气体,使氢气燃烧更加充分;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;管壁材料和当量比对氢气的催化燃烧过程有重要的影响.计算结果为在微动力机电系统中实现催化燃烧以及扩展燃烧极限提供了理论依据.
Catalytic combustion of hydrogen and air mixture inside a micro-tube was numerically investigated by using the commercial CFD code Fluent, coupled with the chemical reaction dynamics subroutine Chemkin. Combustion characteristics for different reaction models and the influence of conducting wall, wall materials（Pt, Si and Al） , inlet velocity, and equivalent ratio of hydrogen/air mixture on surface catalytic combustion reaction were discussed. The computational results show that the surface catalytic combustion restrains the gas phase combustion. The conducting wall in micro-tube preheats the inlet mixture by axial heat transfer. The existence of conducting wall will help to reach full reaction in the microtube. As the inlet velocity increases, both the existence of the surface catalytic combustion and the gas phase combustion become the limiting factors on combustion. Wall material and equivalence ratio of hydrogen/air mixture have important influence on catalytic combustion of hydrogen. Some theoretical evidences are provided for the application of catalytic combustion to micro-electromechanical system and for the extension of the combustion limits.
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2010年第1期58-62,共5页
Journal of Jiangsu University：Natural Science Edition
基金
国家自然科学基金资助项目(50576032)
江苏大学博士生科研创新基金资助项目(CX07B-76X)
关键词
催化燃烧
微型管道
管壁材料
燃烧特性
微尺度
catalytic combustion
micro-tube
wall material
combustion characteristics
micro-scale
