摘要
地下综合管廊应用广泛,燃气泄漏致爆的冲击荷载会对管廊结构内外造成严重破坏。为降低地下综合管廊燃气舱内的爆炸危害,利用Fluent软件对内置多孔结构燃气舱内甲烷/空气预混气体的爆炸过程进行模拟,从管廊内燃气舱结构抗爆角度研究孔隙率分别为40%、50%、60%时的爆炸传播规律、温度抑制效应及爆炸超压衰减效应。基于熄爆参数指标,从爆炸超压和火焰温度两方面综合评估多孔结构对爆炸的抑制效果。结果表明:当多孔结构的孔隙率大于58.4%时,其对爆炸传播的抑制机制占主导作用,能有效抑制爆炸的传播;抑制效果与孔隙率参数存在线性关系,内置孔隙率越大的多孔结构工况对爆炸扰动越显著,最大温度可抑制8%,最大超压可衰减38%,最大速度可降低33%。
The underground utility tunnel has been widely used.In the pipeline leakage accident,the explosive load can cause serious damage to the utility tunnel structure.Aiming at reducing the threat of gas explosion in the utility tunnel,the porous structure barrier property of the underground utility tunnel with explosion process of methane/air premixed gas is simulated and analyzed by Fluent software.The effects of porous structure with porosity of 40%,50%and 60%on explosion propagation,temperature reduction,explosion overpressure attenuation was studied.Based on the evaluation indicator,the paper comprehensively evaluated the barrier effect of porous structure on explosion in points of explosion over pressure and flame temperature.The results show that the porous structure shows good explosion suppression when the explosion suppression mechanism of the porous structure more than 58.4%is dominated,and there is a linear relationship between the internal porosity of the porous structure and the explosion suppression effect,the larger the porosity of the built-in porous structure is,the more significant the explosion suppression effect is.The maximum temperature can be reduced by 8%,the maximum overpressure can be attenuated by 38%,and the maximum velocity can be decreased by 33%.
作者
王皓楠
戚承志
陈昊祥
罗伊
Wang Haonan;Qi Chengzhi;Chen Haoxiang;Luo Yi(School of Civil and Traffic Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Future Urban Design Advanced Innovation Center,Beijing 100044,China;Beijing International Cooperation Base for Urban Transport Infrastructure Construction,Beijing 100044,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第2期164-171,共8页
Fire Science and Technology
基金
国家自然科学基金资助项目(51774018,12172036)
北京建筑大学内涵发展青年基金资助项目(X2102080921019)。
关键词
燃气舱
爆炸
多孔结构
孔隙率
抑爆效应
gas tank
explosion
porous structure
porosity
barrier property
