电力电缆隧道机械通风防护技术研究

Numerical Study of Protection Strategy by Using Mechanical Ventilation in Electric Cable Tunnel Fires

对电力电缆隧道火灾情况下的机械通风防护策略进行了研究。结果表明,合理的隧道纵向通风设置能够使得隧道通风侧火灾环境恢复至初始水平,适用于配合消防人员进入火场开展灭火任务,而在消防任务无法进入火场条件下隧道横向通风适用于隧道内结构及设备的防护。隧道纵向通风在较低的通风量条件下对隧道的防护效果很差,甚至会加剧隧道火灾发展,同时在较大的排烟气流速度条件下横向排烟可能会导致烟气吸穿,造成燃烧不稳定。

The large eddy simulation was adopted in this study, to inveterate the protection strategy by using mechanical ventilation in electric cable tunnel fires. The results indicated that appropriate longitudinal ventilation could return the fire environment of ventilated side of the tunnel to the initial level, to make it suitable for firefighters to enter the scene to put out the fire. A transverse tunnel ventilation is conducive to decrease the overall tunnel fire risk greatly, and is suitable for protection of tunnel structure and equipment, when the firefighters could not reach the fire. In addition, it was found that the effects of tunnel longitudinal ventilation on the protection of tunnels in lower ventilation conditions were limited, and even exacerbate the fire risk of the tunnel. The transverse ventilation in larger exhaust air velocity conditions may cause smoke aspiration, and resulted in combustion instability.