管廊风速对细水雾系统灭火效果影响研究

建立等比例综合管廊数值模型，采用FDS模拟了通风风速为0、0.4、0.8、1.2 m/s下电缆舱着火工况的细水雾灭火效果，分析风速对灭火效果的影响以及纵向通风与细水雾共同作用下的烟气蔓延情况。结果表明，随着通风风速的增加，尽管管廊内部的含氧量增加，但火源及正上方温度下降，很大程度上减缓了火源竖向发展趋势。研究结果证明了高压细水雾灭火系统的有效性。城市综合管廊采用细水雾系统时，施加不高于1.2 m/s风速的通风气流对细水雾灭火更为有利。

Influence of wind speed on fire suppression of water mist in pipe gallery

Numerical model of equal proportion comprehensive pipe gallery was established and the fire suppression of the cable cabin fire by water mist under the ventilation speeds of 0, 0.4, 0.8 and 1.2 m/s was simulated by FDS. The influence of wind speed on fire extinguishing and the smoke spread under the combined action of longitudinal ventilation and water mist were researched. The results showed that with the increase of longitudinal ventilation wind speed, although the oxygen content in the tunnel increases, the temperature at and above the fire source drops, which greatly reduces the vertical development trend of the fire source. The effectiveness of the high pressure water mist fire extinguishing system is proved by the results. When the water mist system is used in the urban comprehensive pipe gallery, it is more advantageous to apply the ventilation airflow with the wind speed no higher than 1.2 m/s to extinguish the fire by water mist.