非均匀分布可燃气云爆炸威力分析

 以高斯分布气云为例，研究了非均匀分布气云爆炸的威力与机理，并与相同泄漏量的均匀分布可燃气云爆炸进行了对比分析。结果表明：当高斯分布可燃气云爆炸时，由于其可燃气体浓度偏离最危险浓度，燃烧速率降低，火焰维持不了自加速运动，对火焰阵面前的气体扰动较小，不会产生较强的冲击波。泄漏量为2228.2m³的乙炔形成的2种高斯分布气云爆炸时，最高超压分别为4.3、1.8kPa，最多具有使玻璃窗破碎的破坏能力。当同样泄漏量的乙炔形成半径20m、乙炔体积分数为13.3%的均匀分布气云爆炸时，可产生42.3kPa的最大超压，具有使砖墙倒塌的破坏能力。因此，在工业现场发生可燃气体泄漏时，首要任务是避免泄漏气体形成混合良好的均匀可燃气云。

ANALYSIS ON EXPLOSION POWER OF NON-HOMOSPHERE FLAMMABLE GAS CLOUD

Taking Gaussian distribution cloud for example, study on explosion power and mechanics of non-homosphere flammable cloud which was compared with homosphere flammable cloud involving same leakage amounts was conducted. The results showed that, due to the deviation of flammable gas from the most dangerous concentration, burning rate decreased and flame could not maintain self-acceleration motion. The powerful shock wave was not built in such cloud explosion because the influence to the gas in front of flame surface was weak. The maximum overpressure was 4.3 and 1.8 kPa respectively in explosion of two Gaussina distribution clouds involving 2228.2 m3 ethyne. The homosphere flammable gas cloud with 20m radius, in which ethyne concentration was 13.3%, was formed with same ethyne amounts. The maximum overpressure of 42.3 kPa produced in the cloud explosion might destroy brick wall. Hence, the most importance thing is to avoid forming mix well flammable cloud when flammable gas is leakage at industry scenes.