隧道车用压缩天然气动态泄漏扩散与燃爆特性  

Dynamic Leakage Diffusion and Combustion Characteristics of Compressed Natural Gas for Tunnel Vehicles

作　　者：漆琦 黄小美 阳东 吕山 陈刘洋 Qi Qi;Huang Xiaomei;Yang Dong;LüShan;Chen Liuyang(School of Civil Engineering,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《燃烧科学与技术》2024年第6期626-634,共9页Journal of Combustion Science and Technology

基　　金：国家重点研发计划资助项目(2021YFC3002000).

摘　　要：为探索隧道中车用压缩天然气泄漏扩散过程中浓度场演化与燃爆后果特性,采用计算流体力学方法研究不同车辆CNG泄漏总量、障碍物条件以及典型泄漏口朝向对车用压缩天然气动态泄漏扩散浓度分布特性的影响.基于泄漏扩散形成的等效化学计量气云体积变化曲线,通过数值模拟计算隧道空间形成最大等效化学计量气云时刻的点火燃爆后果.结果表明:当泄漏口朝上时在泄漏初期形成体积最大等效化学计量气云,而泄漏口朝下时等效化学计量气云体积峰值的形成有延时;车辆障碍物的存在会延缓燃气爆炸超压力的泄放,但对超压力没有明显增强作用.To explore the dynamic leakage diffusion concentration field evolution of automotive CNG in tunnels and the consequences of explosion,the computational fluid dynamics method was used to study the total amount of CNG(compressed natural gas)leakage from different vehicles,and the dynamic leakage diffusion concentration distribution characteristics of automotive CNG under obstacle conditions and typical leakage port orientation conditions.Based on the volume change curve of the equivalent stoichiometric gas cloud formed by leakage diffusion,the ignition and explosion consequences at the time when the maximum equivalent stoichiometric gas cloud is formed in the tunnel space are calculated by numerical simulation.The results show that when the leakage port is facing upwards,the equivalent stoichiometric gas cloud reaches the largest volume at the beginning of the leakage,and when the leakage port is facing downwards,the formation of the peak volume of the equivalent stoichiometric gas cloud has a delay.The presence of vehicle obstacles will delay the release of gas explosion overpressure,but it has no obvious enhancement effect on overpressure.

关 键 词：隧道 压缩天然气 泄漏 等效化学计量气云 燃爆 

分 类 号：TK16[动力工程及工程热物理—热能工程]