地下综合管廊燃气泄漏爆炸后温度场及压力场影响研究

Study on the influence of temperature and pressure field after gas leakage and explosion in underground utility tunnels

利用ANSYS Fluent软件建立内置障碍物综合管廊燃气仓模型,并使用均相湍流燃烧时均方程组、k-ε湍流模型和EBU-Arrhenius燃烧模型对管廊内甲烷空气预混气体爆炸过程进行模拟,探讨管廊内不同火源位置对内置障碍物综合管廊燃气仓内爆燃过程的影响。结果表明,在管廊竖向方向,当点火源高度相对于障碍物高度越高,受障碍物扰动越小,火焰传播进程越快。在水平方向,点火源与障碍物间距越小,管廊内压力上升越缓慢,管廊内火焰传播速度越慢。

The equal-equation equation of homogeneous turbulent combustion time, k-ε turbulence model and Ebu-Arrhenius combustion model in ANSYS Fluent software were used to simulate the explosion process of methane air premix gas in the gas bunker of integrated pipe gallery with built-in obstacles, and the influence of different fire source positions on the ignition process in the gas bunker of integrated pipe gallery with built-in obstacles was discussed. The results show that when the height of ignition source is lower than the level of obstacle in the vertical direction, the flame is disturbed the most and the flame propagates the slowest. In the horizontal direction, the smaller the distance between ignition source and obstacle, the slower the pressure rise rate.