南京长江隧道火灾数值模拟

以南京长江隧道为研究背景,运用火灾动力学模拟软件PYROSIM建立实体物理模型,并将空间划分为0.1 ×0.1 ×0.1m3的网格,对南京长江隧道火灾过程中的纵向通风进行模拟计算.定量分析了不同通风速率条件下火灾及烟气蔓延的规律,并得到隧道拱顶附近温度和烟气分布状况.模拟结果显示较小风速下烟气会产生回流,但随着风速增大烟气扩散速率随之加快,通过对3种不同风速的分析比较,选择3.0m/s纵向通风作为临界风速.进一步结合南京长江隧道现有的消防设施及应急救援系统,分析该临界风速下烟气温度对隧道结构和毒害气体对人员疏散救援的影响.结果显示此临界风速下隧道结构安全,且在疏散及时、救援有效的基础上,基本能保证人员疏散安全.

The numerical simulation on the Nanjing YANGTZE river tunnel fire

With the NANJING YANGGZR river Tunnel as the research background,The Fire Dynamics Simulator（PYROSIM） is utilized to establish the physical model in this paper.The software divides the space into 0.1×0.1×0.1m3 grid to simulate the longitudinal ventilation in NANJING YANGTZE river Tunnel fire.Quantitative Analysis the laws of fire and smoke flow propagation under different longitudinal ventilation velocities and finally obtains the distribution of the flue gas and the temperature near the vault.The result shows that the smoke flow will reflow when the speed too small while along with the increase of ventilation velocity,the rate of diffusion of smoke flow is significantly increase.By analyzing the distribution of the temperature of the vault and smoke flow in the tunnel,3 m /s well be the best choice for the ventilation velocity.The further study analysis that under the critical speed,the influences of the smoke temperature on the tunnel structure as whlie as the influence of the Poison smoke on the save evacuation according to the fire facility and emergency rescue system of NANJING YANGTZE river Tunnel.The result shows that on this critical speed,the structure of tunnel can keep safety as while people in the tunnel could basically evacuate safely only if the rescue in time and effective.