【摘要】 综合管廊应用广泛，泄漏燃气爆炸会对管廊造成严重破坏。利用燃气舱内潜在的泄爆体系，可降低爆炸冲击带来的危害，但是目前还缺乏这方面的定量研究。针对地下综合管廊中爆炸传播过程，利用Fluent软件建立了三维数值模型，模拟了不同破膜压力下火焰传播、爆炸超压、爆炸超温的变化情况。结果表明：随着破膜压力增加，舱内火焰最大传播速度、最大爆炸超压、最大初始温度逐渐增加，火焰在燃气舱内持续的时间增加、泄爆口处火焰速度减缓；当破膜压力小于60 kPa时，舱内最大超压为燃烧混合物泄放产生的峰值；当大于60 kPa时，外部爆炸的气体不足以阻碍内部已燃气体的泄放，舱内最大爆炸超压为二次爆炸产生的峰值。泄爆可以延缓并降低首次爆炸超温峰值的出现。研究结果将有助于深入了解泄爆作用下综合管廊内燃气爆炸的传播规律以及为燃气舱内逃生口的设计提供参考。更多还原

【Abstract】 The underground utility has been widely used. Explosions of leaked gas can cause serious damage to the underground utility. Utilizing the potential explosion venting system inside the gas cabin can reduce the harm caused by explosion shock. But there is currently a lack of quantitative research in this area. A three-dimensional numerical model established by Fluent software was applied for simulating the process of explosion propagation in a gas chamber. The variation patterns of flame propagation, explosion overpressure, and explosion overtemperature were investigated under different vent burst pressures. The results indicate that as vent burst pressure increases, the maximum flame propagation velocity, explosion overpressure, and initial temperature gradually increase within the chamber, and in contrast, the duration of flame inside the gas chamber and the flame velocity at venting port decrease. When vent burst pressure is less than 60 kPa, the maximum overpressure in the chamber is generated by the release of burning mixture. When it exceeds 60 kPa, gas from external explosion is insufficient to hinder the release of burning gas inside, and the maximum explosion overpressure in the chamber is caused by the secondary explosion. Explosion venting can delay and reduce the occurrence of the first explosion overtemperature peak, and a larger vent burst pressure is more conducive to monitoring temperature changes at each measuring point. The results can provide a reference for the study of gas explosion propagation within an underground utility tunnel, as well as for the design of an escape opening within the chamber.更多还原