不同泄压条件对方管内爆炸压力特性的影响

Influence of different pressure relief conditions on explosion pressure in square pipeline

为研究泄压膜约束条件对甲烷/空气预混气体爆炸压力特性的影响,在方形火焰燃烧传播测试管道中布置压力传感器,开展不同泄压膜材料、泄压膜层数及泄压口位置实验。结果表明:牛皮纸和聚丙烯薄膜约束泄爆过程中,每增加一层泄压膜,管道内最大泄爆压力平均上升11.2%和12.3%。各强度泄压膜约束条件下,管道内最大泄爆压力随着泄压口位置接近点火端,均呈现Z形规律,当泄压口设置在距尾部端面0.25 m时,各曲线达到最小值,当泄压口设置在距尾部端面0.50 m时,各曲线出现最大值。

In this work we carried out vented explosion experiments with different pressure relief membrane material and layers and different venting locations in the square flame propagation test pipeline and investigated the influence of pressure relief membrane constraints on explosion pressure’s characteristics of premixed methane/air gas using the pressure sensor to measure the peak overpressure under various experimental conditions in the pipeline and comparing their venting effects.The results showed that there is a linear relationship between the maximum explosion pressure and the number of relief membrane layers made of the same material.The maximum explosion pressure in the pipeline increased by 11.2%and 12.3%respectively for each additional pressure relief membrane layer of kraft paper and polypropylene film.As the venting location approached the ignition end,the maximum explosion pressure in the pipeline showed a“Z”pattern with different pressure relief membrane strengths.When the venting location was set at 0.25 m from the trailing end,the minimum value was observed for each curve.When the venting location was set at 0.50 m from the trailing end,each curve reached its maximum value.