表面催化反应对小尺度空间内气相燃烧的影响  

Effect of Surface Catalytic Reaction on Gas Phase Combustion Inside Miniscale Combustor

作　　者：徐侃[1] 刘明侯[1] 张先锋[1] 陈义良[1] 

机构地区：[1]中国科学技术大学热科学和能源工程系,合肥230027

出　　处：《燃烧科学与技术》2009年第2期187-191,共5页Journal of Combustion Science and Technology

基　　金：国家高技术研究发展计划(863)资助项目(2007AA05Z236)

摘　　要：表面催化燃烧是微、小尺度空间内组织燃烧的重要手段.采用表面催化反应动力学方法,基于FLUENT软件自主开发了仿效CHEMK IN的催化反应动力学模型,实现了化学反应和流动的同步模拟.通过验证算例发现,该模型可获得与DETCHEM软件一致的计算结果,且与实验结果符合较好.采用该数值模型,对小尺度二维渐扩通道内Pt表面催化时CH4/空气燃烧进行研究.计算结果表明,不同当量比时表面催化反应都显著缩小了气相燃烧的熄火距离;气相燃烧火焰面增厚,火焰前沿处温度梯度变小.此外,表面催化对贫燃料燃烧的影响更显著.Surface catalytic reaction is an important way to organize effective and stable combustion inside a micro or miniscale combustor. The surface catalytic kinetics was applied to develop a numerical method based on FLUENT software package, which imitates CHEMKIN surface catalytic kinetics model. This numerical method, which can couple the catalytic o reaction with hydrodynamics, was evaluated by comparing the simulative results with those of DETCHEM software package and the experimental data. Using the method, the effect of Pt surface catalytic reaction on homogeneous lean fuel premixed combustion of CHJAir in a 2-D mini-scale expanding channel was studied. Compared with homogeneous combustion, catalytic reaction could achieve reduced extinction distance, thicker flame and lower temperature gradient near flame front. Besides, the effect of surface catalytic reaction on gas phase combustion is more sensitive to low equivalence ratio.

关 键 词：反应动力学 催化燃烧 熄火距离 

分 类 号：O643.3[理学—物理化学]