摘要
我国综合管廊内燃气安全问题亟待研究和解决。为了研究管廊内燃气爆炸荷载特性,在0.11 m×0.11 m×6 m的小尺寸管道内进行甲烷-空气混合气体封闭爆炸实验,研究了在不同点火能量(电极点火-2 J;化学点火-5 J)下,甲烷浓度为7.5%~13.5%的爆炸波的传播规律。结果表明:燃气爆炸超压峰值随浓度的增大先增加后减少,在浓度为10.5%时超压峰值最高;点火能量提高时,超压峰值普遍提高。采用SIMTEC数值分析软件对实验进行模拟,选用大涡湍流模型和修改的涡耗散概念燃烧模型能够很好的验证管道内燃气爆炸最危险的情况(甲烷-空气充分燃烧爆炸情况)。
It is urgent to study and solve the problem of gas safety in comprehensive pipe gallery.In order to explore the gas explosion load characteristics in the utility tunnel,the methane-air mixed gas enclosed explosion experiment was conducted in a small size pipeline of 0.11 m×0.11 m×6 m.The propagation rule of explosive waves with methane concentration between 7.5%and 13.5%at different ignition energies(electrode ignition-2 J;chemical ignition-5 J)was studied.The results showed that the overpressure peak of gas explosion increased first and then decreased with the increase of concentration(reaching the peak value at 10.5%).In addition,with the increase of ignition energy,the overpressure peak generally increased.SIMTEC numerical analysis software was used to simulate the experiment.Meanwhile,the Large Eddy Simulation and the modified Eddy Dissipation Concept model were adopted,which could well verify the most dangerous case of gas explosion in pipeline(methane-air full combustion explosion).
作者
闫秋实
张亚楠
李述涛
孙庆文
YAN Qiu-shi;ZHANG Ya-nan;LI Shu-tao;SUN Qing-wen(Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Institute of Defense Engineering,AMS,PLA,Beijing 100036,China;China Academy of Building Research,National Center of Quality Supervision and Test of Building Engineering,Beijing 100013,China)
出处
《爆破》
CSCD
北大核心
2021年第1期140-146,共7页
Blasting
基金
北京市自然科学基金(8182009)
国家自然科学基金(51678018)。
关键词
综合管廊
超压
数值分析
甲烷爆炸
utility tunnel
overpressure
numerical analysis
methane explosion
