综合管廊燃气舱内天然气泄漏扩散数值模拟

Numerical Simulation of Gas Leakage Diffusion in Gas Compartment of Utility Tunnel

分析燃气管道圆形孔口泄漏量,建立了一段长200m、宽2m、高3m的燃气舱模型,机械进风口、排风口分别设置在燃气舱的两端,用Fluent软件进行数值模拟,分析泄漏孔距排风口水平距离分别为0.1m、50m、100m、150m、199.9m时,燃气舱内燃气泄漏扩散的规律。泄漏孔距离排风口越远,燃气泄漏后的扩散范围越大,危险度也越高,泄漏扩散区城大部分处于爆炸危险状态。提出降低燃气舱危险度的建议。

In order to analyze the leakage rate of the circular orifice of the gas pipeline,a gas compartment model with a length of 200 m,a width of 2 m and a height of 3 m was established.The mechanical air inlet and air outlet were respectively set at the two ends of the gas compartment,and the numerical simulation was performed by Fluent software.The law of gas leakage diffusion in the gas compartment is analyzed when the horizontal distances between the leakage hole and the air outlet are 0.1 m,50 m,100 m,150 m and 199.9 m respectively.The farther the leakage hole is from the air outlet,the larger the diffusion range after gas leakage,and the higher the risk.The leakage diffusion area is mostly in an explosion hazard state.Suggestions to reduce the risk of gas compartment are proposed.