不同形状障碍物对综合管廊燃气舱燃气爆炸影响研究

Investigation of the impact of various obstacles on gas explosions overpressure within the comprehensive pipe gallery

为深入了解城市地下综合管廊燃气舱内障碍物对燃气爆炸的影响规律,利用FLACS模拟软件,研究了不同形状障碍物对燃气爆炸超压变化的影响。结果表明:燃气管廊发生爆炸后,在管廊分区前段,三种形状障碍物对燃气爆炸的影响结果相差较小;在管廊分区中段,圆柱体障碍物所在位置超压峰值最大,最大超压峰值达到1234.716 kPa;在管廊分区末段,球体障碍物所在位置超压峰值最大,最大超压峰值达到2673.528 kPa。根据研究结论,在城市地下综合管廊燃气舱设计时通过改变燃气管廊分区前段、中段和末段的障碍物形状,降低障碍物对爆炸的影响,可以更准确地评估燃气入廊风险,完善燃气舱安全防护措施,降低燃气爆炸事故造成的影响。

To enhance comprehension of gas explosions within the urban underground comprehensive pipeline corridor,this study employs FLACS simulation software to examine the impact patterns of spherical,cylindrical,and square obstacles on gas explosion dynamics.As a result of the obstacles positioned within the gas chamber of the pipeline corridor,these impediments exert a distinct influence by both obstructing and exciting the gas explosion shock wave and flame.This study aims to elucidate the adverse effects stemming from various obstacle shapes on the propagation of gas explosions.The findings indicate that following an explosion within the underground integrated corridor gas chamber,the presence of spherical,cylindrical,and square obstacles in the corridor partition ahead leads to reduced gas explosion effects;when the spherical,cylindrical,and square obstacles are positioned within the central corridor partition,the location of the cylindrical obstacle has the most significant impact on the peak overpressure compared to the other two obstacles during the explosion;when the spherical,cylindrical,and square obstacles are positioned at the end of the pipe corridor partition,the overpressure curve graph indicates that the sphere obstacle's placement results in the highest impact value on the overpressure.The study results suggest that by altering the shape of obstacles at the front,middle,and end of the gas corridor partition,it is possible to mitigate the impact of obstacles on explosions.This approach enables a more precise assessment of gas ingress into the corridor,facilitating the enhancement of scientifically sound safety measures for gas chamber protection.Ultimately,this can reduce the occurrence and impact of gas explosion accidents,thus elevating the overall safety standards of the gas chamber,offering valuable theoretical insights for future improvements.