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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 change of deflagration pressure of the premixed methane / air tube with position and time in the tube, six pressure sensors were arranged on the semi-closed plexiglass tube of 1.5m in length to test different methane concentrations, different repetitive barrier sheets and different sealing constraints Pressure distribution of combustible gas in lower pipe. The experimental results show that: (1) The peak pressure of deflagration first increases and then decreases at each measuring point, and the maximum pressure appears at about 2/3 of the pipeline pressure pulsation in the middle of the pipeline. (2) The deflagration pressure is the best near the optimum concentration, and the deflagration pressure is obviously increased by the built-in repetitive barrier plates. (3) The size of the deflagration pressure is related to the thickness and tensile strength of the sealing material. The thicker the material is, the larger the tensile strength is.