纵向通风与侧壁开口竖井自然排烟协同作用下烟气运动模拟

为探究山岭隧道火灾烟气运移特性,采用数值模拟的方法,选取两种典型火源功率(20 MW及50 MW),分析不同纵向风速下火源位置对隧道顶棚下方沿程温度分布规律、烟气运移速率及竖井内烟气质量流量的影响规律.研究结果表明,纵向风速低于3m/s时,不同火源位置时,火源上游沿程温度均随纵向风速增加逐渐降低,而下游沿程温度随纵向风...

Simulation on the smoke movement under the synergistic effect of longitudinal ventilation and natural smoke exhaust of sidewall opening shaft

In order to explore the characteristics of fire smoke transport in mountain tunnel, two typical fire source powers (20 MW and 50 MW) were selected by numerical simulation method to analyze the influence of fire source position on temperature distribution under tunnel roof, smoke transport rate and mass flow rate in shaft smoke under different longitudinal wind speeds. The results show that when the longitudinal wind speed is lower than 3 m/s, the temperature along the path of the upstream of the fire source decreases gradually with the increase of the longitudinal wind speed, while the temperature along the path of the downstream of the fire source shows an opposite trend with the increase of the longitudinal wind speed. When the fire source is near the shaft, the smoke spreading speed in the upstream and inside the shaft is higher than that in the far end of the shaft. When the fire source was far away from the shaft, the mass flow of smoke in the shaft reached the peak value of about 2 m/s with the longitudinal ventilation, while when the fire source was close to the shaft, the mass flow of smoke in the shaft reached a higher level when the longitudinal wind speed was low.