O3对甲烷／空气着火过程的影响  

Effects of O_3 on the Ignition of CH_4/Air Mixtures

作　　者：郭鹏[1] 陈正[1] 

机构地区：[1]北京大学,工学院,湍流与复杂系统国家重点实验室,北京100871

出　　处：《工程热物理学报》2011年第12期2160-2163,共4页Journal of Engineering Thermophysics

基　　金：北京市自然科学基金资助项目(No.3102016)

摘　　要：本文基于零维均质着火系统研究了非平衡等离子中臭氧(O_3)对甲烷/空气着火过程的影响,并通过化学反应路径分析揭示了O_3促进甲烷/空气着火的化学反应机理。研究结果表明,O_3促进甲烷/空气着火主要是通过化学反应动力学效应来实现的,热效应的影响十分有限。在不添加O_3时,甲基的氧化速率缓慢,从而导致甲烷/空气不易着火;在添加O_3后,甲基可以通过反应CH_3+O=CH_2O+H,CH_3+O=CO+H+H_2以及CH_3+HO_2=CH_3O+OH被迅速氧化,因此O_3能够促进甲烷/空气的着火。Numerical simulation of the homogeneous ignition process was conducted to assess the effects of O3 generated by non-equilibrium plasma on the ignition of methane/air mixture. Moreover, reaction-path analysis was conducted to find the kinetic mechanism of methane/air ignition enhancement by O3. It was found that the kinetic effect of O3 dominates in the ignition enhancement while tim thermal effect has little influence. The oxidization of CH3 is relatively slow without the addition of Oa which results in the slow ignition of methane/air. However, CH3 can be quickly oxidized through reactions CH3＋O=CH2O＋H, CH3＋O=CO＋H＋H2, and CH3＋HO2=CH3O＋OH when O3 is added. Therefore, Oaean accelerate the ignition of methane/air mixture.

关 键 词：着火 O3 甲烷/空气 化学反应路径分析 

分 类 号：TK412[动力工程及工程热物理—动力机械及工程]