甲醇中低温着火延迟时间的计算模型  

Computational Model of Low-to-Intermediate Temperature Ignition Delay Time for Methanol-Air Mixture

作　　者：杨浩林[1] 霍杰鹏[1] 蒋利桥[1] 汪小憨[1] 赵黛青[1] Yang Haolin Huo Jiepeng Jiang Liqiao Wang Xiaohan Zhao Daiqing(Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China)

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》2016年第6期522-526,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51336010)

摘　　要：研究了甲醇在中低温条件下的氧化特性,通过对详细反应机理的分析,得到一个九步的骨干机理,在1,500,K下其着火延迟时间预测值与详细机理的预测值基本一致.通过理论分析着火感应期内占主导作用的自由基行为,最后得到了一条能用于估算甲醇中低温着火延迟时间的显式公式.该公式显示甲醇在中低温下的着火延迟时间主要取决于CH3OH+HO_2→CH_2OH+H_2O_2的反应速率.该反应对甲醇在中低温下氧化特性有重要的影响.The oxidation characteristics of methanol-air mixture at low-to-intermediate temperatures were investi- gated numerically in this work. Based on the analysis of the detailed kinetic mechanism of methanol, a nine-step skeletal model was developed and validated by comparing the computational ignition delay time under 1 500 K with that from detailed mechanism. With further analysis of auto-ignition behavior in a homogeneous adiabatic system, an explicit formula for ignition delay time was derived, which had a simple form and showed good agreement with numerical results. It was indicated that the ignition delay time of methanol-air mixture at low-to-intermediate temperatures was mainly controlled by the reaction rate of CH3OH ＋ HO2→CH2OH ＋ H2O2, which has a dominant effect on the oxidation behavior of methanol within this temperature range.

关 键 词：甲醇 着火延迟 中低温 反应动力学 

分 类 号：TK16[动力工程及工程热物理—热能工程]