阻塞比对甲烷火焰传播特性影响的数值模拟研究  

Numerical Simulation on Effects of Obstacle Blockage Ratio on Methane Flame Propagation Characteristics

作　　者：郑雨 戴文元[1] 王国大[1] 黄燕晓[1] 程关兵[1] ZHENG Yu;DAI Wen-yuan;WANG Guo-da;HUANG Yan-xiao;CHENG Guan-bing(Aeronautical Engineering College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学航空工程学院,天津300300

出　　处：《装备制造技术》2018年第1期7-10,共4页Equipment Manufacturing Technology

基　　金：教育部留学回国人员科研启动基金资助(教外司留【2015】-311-49)

摘　　要：分别采用标准k-ε湍流模型和六步反应机制,利用Fluent软件对常温常压下甲烷火焰在具有不同阻塞比的障碍物管道中的传播特性进行数值模拟研究,分析了障碍物阻塞比对火焰传播速度、火焰结构形态、火焰到达位置和时刻等参数的影响。计算结果表明:在起初阶段,火焰传播速度逐渐增加,但火焰在流经障碍物过程中其速度大小呈振荡变化特点;在障碍物附近时,火焰速度增加,在相邻障碍物间时火焰速度下降。障碍物阻塞比越高,火焰传播速度越高,加速能力也越强,加速时间越短,火焰传播距离也越长。火焰加速传播主要是火焰与障碍物、管道壁面以及压缩波相互作用的结果。Abstract:The present paper examined methane flame propagation characteristics at normal pressure and room tem原perature in an obstructed channel with various blockage ratios by means of software Fluent.Both normal k-着tur原bulence model and six-step kinetic mechanisms were employed,accordingly.Effects of the obstacle blockage ra原tios on flame propagation velocity,structure shape,and flame propagation position and moment were investigated.The numerical results show that the flame propagation velocity increases in the initial stage of the flame accelera原tion.Meanwhile,the flame velocity oscillates along the obstacles.The flame velocity increases gradually in the proximity of each obstacle and slows down in two adjacent obstacles.When the obstacle has higher blockage ratio,the flame velocity is higher.The flame capacity to accelerate is more effective to shorten the acceleration time and increase the acceleration distance.The flame acceleration is originated from the interaction among the flame and the obstacle,channel surface and compression waves.

关 键 词：甲烷 火焰传播 阻塞比 k-ε湍流模型 六步反应机制 

分 类 号：TK16[动力工程及工程热物理—热能工程]