1. State Key Lab of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing　 100083,China;2. School of Resource & Safety Engineering,China University of Mining and Technology(Beijing),Beijing　 100083,China

为研究瓦斯/空气预混气体爆炸火焰传播速度特征,利用瓦斯爆炸实验系统开展了9.5%体积分数下的瓦斯爆炸实验,通过高速摄影系统拍摄了爆炸火焰传播图像;分析提出了利用图像相关系数法计算瓦斯爆炸火焰传播速度的基本原理和方法,计算分析了9.5%体积分数瓦斯爆炸全过程中的火焰传播速度动态变化规律。结果表明:爆炸火焰处于加速、减速、反向传播,再加速、减速直至熄灭的过程,火焰不断震荡。进一步地对爆炸火焰进行了细化分析,通过对预处理图像进行横向和纵向的等分,计算视窗中不同部分的火焰传播速度,并与按整体计算的速度进行对比验证。利用该方法可以计算瓦斯爆炸火焰充满整个管道时的传播速度,为研究瓦斯或者其他气体爆炸火焰传播规律提供了一种新途径。

A gas explosion at 9. 5% concentration was performed in an experimental system and the images of propaga- ting flame were shot by a high-speed photography system in order to investigate the flame velocity of premixed gas / air mixture explosion. A new computational method of methane explosion flame propagation velocity was proposed based on the correlation coefficient between two adjacent flame images. Variation of gas explosion flame velocity of the whole process was obtained and the characteristics of dynamic changes were analyzed. The results indicate that the explosion flame undergoes a process of acceleration, deceleration, reverse acceleration, and reverse deceleration until it is quenched. Further research was performed by analyzing the details of explosion flame images and the flame propagation velocity of different regions in observation window. Comparison of two kinds of results proves that this method is accu- rate and reliable. The process of calculating the propagation velocity of gas explosion can be applied to the condition that flame is full of pipe.

北京理工大学重点实验室开放基金资助项目(KFJJ12-10M)；中央高校基本科研业务费资助项目(2009KZ03)；

Nie Baisheng,Yang Longlong,Meng Junqing,et al. Characteristics of flame propagation velocity of gas explosion in duct based on image processing[J]. Journal of China Coal Society,2016,41(4):884-891.