管道内不同浓度甲烷爆炸传播特性的实验研究

Experimental Study on Explosion Propagation Characteristics of Varied Density Methane in Duct

在水平管道式气体爆炸装置中,选取5种不同浓度的甲烷进行爆炸实验,研究在甲烷爆炸传播过程中,最大爆炸压力、压力上升速率及压力峰值时间随甲烷浓度及传播距离的变化规律。研究结果表明:甲烷浓度对最大爆炸压力、压力上升速率和压力峰值时间的影响显著:甲烷浓度越接近化学当量浓度,最大爆炸压力和压力上升速率越大,压力峰值时间越短。随着传播距离的增大,最大爆炸压力和压力上升速率先增大再减小,压力峰值时间则依次延长。甲烷浓度偏离化学当量浓度越多,压力峰值时间成倍延长。

Five kinds of density methane was selected and tested in the horizontal pipeline gas exploding device to research the change rule of the maximum explosion pressure, the maximum rate of pressure rise and the arrival peak time with the methane concentration and propagation distance. The results show that the influence of methane concentration on the maximum explosion pressure, the maximum rate of pressure rise and the arrival peak time is remarkable. The closer to the chemical equivalent concentration the methane is, the larger the explosion pressure and the rate of pressure rise are, the shorter the arrival peak time is. With the extension of propagation distance, the explosion pressure and the rate of pressure rise for methane increasing firstly and decreasing subsequently, the arrival peak time extends with the distance. The more methane concentration deviate from the chemical equivalent concentration, the more expand arrival peak time is.