隧道内埋地燃气管道泄漏数值模拟研究

Numerical Simulation of Leakage from Buried Natural Gas Pipelines in Tunnel

利用FLUENT软件模拟研究,分析不同管道入口压力、泄漏孔尺寸和隧道风速等因素对隧道内燃气管道泄漏量和扩散范围的影响。结果表明:(1)管道入口压力、泄漏孔尺寸越大,泄漏孔附近甲烷浓度越高,甲烷泄漏量越大,进入隧道空气区域甲烷质量分数越高,甲烷扩散范围越广,泄漏危险区域越大。(2)隧道一侧设有风速时,泄漏的甲烷跟随风流流至隧道另一出口,泄漏孔附近甲烷呈非球状向周围土壤和隧道空间区域扩散;隧道内风速越大,风速入口方向上泄漏扩散的甲烷越少,被风吹至另一侧甲烷越多。

The FLUENT software was used to simulate and study the influences of different pipeline inlet pressure,leakage hole size,pipeline burial depth and tunnel wind speed on the leakage amount and diffusion range of gas pipeline in the tunnel.The results show that:(1)The larger the inlet pressure of the pipeline and the size of the leak hole,the higher the methane concentration near the leak hole,the larger the methane leakage amount,the higher the methane mass fraction in the air area of the tunnel,the wider the methane diffusion range,and the larger the leakage danger area.(2)When there is wind speed on one side of the tunnel,the methane leakage follows the wind flow to the other exit of the tunnel,and the methane near the leakage hole diffuses to the surrounding soil and tunnel space in a non-spherical manner;The greater the wind speed in the tunnel,the less methane will leak and diffuse in the direction of wind speed inlet,and the more methane will be blown to the other side.