Abstract:

According to the characteristics of the canteen, the FLACS software was used to build a three?dimensional model for a university canteen. On the basis of considering the jet direction, obstacles and other factors, the leakage and explosion of natural gas were simulated, and the diffusion process of gas cloud, the development law of explosion shock wave and temperature in a specific scene were studied. The results show that when the gas leaks vertically upward, the gas accumulates in the small booth due to the obstruction of the canteen roof. When the natural gas leaks horizontally, the volume fraction of natural gas cloud in the dining area is higher. At the initial stage of the explosion, the explosion pressure shock wave centered on the ignition point first appears, and the pressure shock wave travels outward in a circular arc. The leakage direction has little effect on the maximum over pressure generated by the explosion.The temperature distribution is greatly affected by the direction of leakage. When vertical injection is carried out, the high temperature is concentrated in the small booth. When horizontal injection is carried out, the temperature is distributed from high to low.

Key words: School canteen, FLACS software, Leak, Explosion

摘要：

针对食堂的特点，利用FLACS软件对某大学食堂进行三维建模，在考虑喷射方向、障碍物等因素的基础上，模拟天然气的泄漏及爆炸情况，研究了特定场景下气体云团的扩散过程、爆炸冲击波和温度的发展规律。结果表明，当天然气垂直向上泄漏时，因食堂屋顶的阻碍作用，天然气在小型摊位发生堆积；当天然气水平泄漏时，天然气在用餐区域体积分数较高；爆炸初期，首先出现以点火点为中心的爆炸压力冲击波，压力冲击波以圆弧形向外传递，泄漏方向对爆炸产生的最大超压影响较小；温度分布受泄漏方向的影响较大，垂直喷射时高温集中在小型摊位处，水平喷射时温度沿喷射方向由高到低分布。

关键词: 学校食堂, FLACS软件, 泄漏, 爆炸