有机玻璃方管内可燃气体爆燃压力分布研究

Study on the Pressure Distribution for Combustible Gas Flame Propagation in Plexiglass Tube with Quadrate Cross Section

为了研究管内甲烷/空气预混气体爆燃压力随位置和时间的变化情况,在1.5m长半封闭有机玻璃方管上布置6支压力传感器,测试不同甲烷浓度、不同重复障碍片以及不同封口约束条件下管内可燃气体爆燃压力分布规律。实验结果表明:(1)各测点处爆燃峰值压力先增加后减小,在管道约2/3处压力出现最大值,管道中段处有压力脉动现象。(2)最佳浓度附近爆燃压力最大,而内置重复障碍片使得爆燃压力明显增加。(3)爆燃压力的大小与封口材料的厚度和抗拉强度有关,材料越厚、抗拉强度越大管内爆燃压力值越大。

In order to study the premixed methane-air flame deflagration pressure and its relation with location and time, six piezoelectric pressure sensors were fixed at the semi-enclosed plexiglass tube with quadrate cross section and 1.5 meters long, and the laws of defiagration pressure distribution were investigated experimentally under the condition of different methane concentrations, different repeat baffles, and different sealing materials at open end, respectively. The experimental results showed that： （1） the peak-pressure at testing points increased firstly, then decreased, and the maximum pressure presented at about 2/3 location of the tube, pressure pulsation showed at the middle section of the tube. （2） the maximum pressure appeared at near the optimal concentration, and the repeat baffles can accelerate the deflagration pressure significantly. （3）the deflagration pressure was linked with the thickness and tensile strength of sealing materials, and the bigger thickness or tensile strength was, the greater deflagration pressure was.