摘要
通过小尺度实验,研究了半封闭空间甲烷爆炸火焰前沿位置、传播速度随时间和空间的变化规律,以及甲烷浓度对其的影响。研究得出:在时间分布上,甲烷爆炸初期火焰前沿位置和传播速度随时间近似呈指数型增长,传播速度存在波动性;甲烷浓度越大,火焰初始传播速度越大。在空间分布上,在火焰前沿达到管道长径比4～6之前,传播速度在20m/s以下,达到4～6处,速度开始明显增大;在管径相同的管道中,甲烷在化学当量比附近由燃烧达到爆炸的距离最短;当甲烷浓度向大小两个方向变化时,由燃烧达到爆炸的距离逐渐增大。
The variation law of the front position and propagation speed of methane explosion flame within semi-closed space with the change of time and space was studied by small-scale experimentation. The study concluded that in time distribution,the front position and propagation speed of flame increased exponentially with the time at the initial stage of methane explosion,and the propagation speed presented the fluctuation property. The higher the concentration of methane,the greater the initial propagation speed of the flame is; in spatial distribution,the speed is less than 20 m/s before the flame front got to the point where length-diameter ratio of laneway was 4-6, starting the obvious increase of speed; in the laneway with same diameter, the distance of methane getting to explosion from combustion was shortest with the stoichiometric concentration of methane, and it got longer with the increase or decrease of methane concentration.
出处
《山东科技大学学报（自然科学版）》
CAS
2011年第6期20-24,共5页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(51104164)
灭火救援技术公安部重点实验室青年基金项目(QF201105)
关键词
半封闭空间
甲烷爆炸
火焰传播
semi-closed space
methane explosion
flame propagation
