To effectively prevent and mitigate explosion hazards and casualties, relief venting of flammable gas explosions has been applied in production processes in a broad variety of industries. This work conducted fully vented experiments to investigate the influence of venting membrane thickness, and partially vented experiments to investigate the influence of baffle blocking rate on the explosion characteristics of 9.5 vol% methane-air mixtures in linked vessels with a 0.5 m long vented duct. Results indicate that the membrane thickness and blocking rate for the two types of vented explosions significantly affected the explosion overpressure. The smaller the membrane thickness and blocking rate, the lower the explosion overpressure. Secondary explosions were observed in the vented duct through experiments and a weaker explosion flame appeared at a small blocking rate of 20%. With the further increase in the blocking rate, the flame became extremely weak, and no secondary explosions occurred. The overpressure evolution process at different positions in the explosion duct and secondary explosion phenomenon in the vented duct were investigated. This work could probably serve as an important reference for the selection of technical parameters of explosion venting in the practical industrial processes.

为有效预防和减轻爆炸危险和人员伤亡，可燃气体爆炸泄压已应用于各行各业的生产过程中。这项工作进行了完全通风实验以研究通风膜厚度的影响，并进行了部分通风实验以研究挡板阻塞率对具有 0.5 m 长通风管道的连接容器中 9.5 vol% 甲烷-空气混合物爆炸特性的影响。结果表明，两种泄放式爆炸的膜厚度和阻塞率对爆炸超压有显着影响。膜厚和阻塞率越小，爆炸超压越低。通过实验观察到通风管道发生二次爆炸，以20%的小阻塞率出现较弱的爆炸火焰。随着阻断率的进一步提高，火焰变得极其微弱，没有发生二次爆炸。研究了爆炸管内不同位置的超压演化过程和通风管内的二次爆炸现象。该工作可能对实际工业过程中的泄爆技术参数的选择具有重要的参考价值。研究了爆炸管内不同位置的超压演化过程和通风管内的二次爆炸现象。该工作可能对实际工业过程中的泄爆技术参数的选择具有重要的参考价值。研究了爆炸管内不同位置的超压演化过程和通风管内的二次爆炸现象。该工作可能对实际工业过程中的泄爆技术参数的选择具有重要的参考价值。