壁面反应对微小空间内甲烷/空气着火特性的影响  

Effect of Surface Reaction on Ignition Characteristics of Methane/Air Mixture in a Micro-Scale Combustor

作　　者：杨浩林[1] 霍杰鹏[1] 蒋利桥[1] 汪小憨[1] 赵黛青[1] 

机构地区：[1]中国科学院广州能源研究所,中国科学院可再生能源重点实验室,广州510640

出　　处：《燃烧科学与技术》2015年第3期196-202,共7页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51336010);国家重点基础研究发展计划(973计划)资助项目(2014CB239601)

摘　　要：通过对微小空间内甲烷/空气预混气着火过程的数值模拟,考察了壁面反应对着火特性的影响,并对主要基元反应进行了敏感性分析.结果表明,壁面反应对甲烷/空气预混气的着火有抑制作用,并主要取决于壁面对CH3自由基的吸附能力;提高初始温度、初始压力以及化学当量比能有效减少壁面反应的影响,缩短着火延迟时间;壁面吸附系数和比表面积的乘积可以表征壁面反应的强度,这个量越大,壁面反应对着火的抑制作用越显著.The ignition process of premixed methane/air in a micro-scale chamber is simulated in combination with surface chemistry. The effect of surface reaction on ignition characteristics is analyzed and the sensitive analysis of main elementary reactions is performed. It is found that the ignition of the mixture is inhibited by surface reaction, which depends on the sticking ability of the surface on CH3 radical. The ignition inhibition caused by surface reaction can be reduced and the ignition delay time shortened by increasing the initial temperature,initial pressure and equiva-lence ratio. Finally,the product of sticking coefficient and surface-area-to-volume ratio is found to measure the inten-sity of surface reaction. The larger the product is,the stronger the inhibition of ignition by surface reaction will be.

关 键 词：壁面反应 着火延迟 微燃烧 比表面积 吸附系数 

分 类 号：TK16[动力工程及工程热物理—热能工程]