水电站电缆竖井细水雾灭火性能数值模拟研究

水电站电缆竖井是用于给水电站铺设供电电缆或通信电缆的竖直高层通道，高度可达百米。如若封堵不严或无封堵，火灾将沿着电缆竖井迅速蔓延。本文以某水电站电缆竖井为研究对象，采用FDS 数值模拟软件，研究了高压细水雾喷头纵向间距、同时启动的楼层数、喷头流量系数和喷雾角度4 种因素对灭火效果的影响。确定了各因素临界值，以有效发挥灭火作用，该结果可为水电站电缆竖井灭火系统设计提供参考。

Numerical simulation study of water mist fire extinguishing performance in cable shaft of hydropower station

The cable shaft of a hydropower station is a vertical high-rise channel, up to 100 meters high, used for laying power supply cables or communication cables for a hydropower station. If it is not well sealed or not sealed, the fire will spread quickly along the cable shaft. Taking the cable shaft of a hydropower station as the research object and using FDS numerical simulation software, this paper studies the influence of four factors, including longitudinal distance of high pressure water mist nozzles, number of simultaneous starting floors, nozzle flow coefficient and spray angle, on the fire- extinguishing effect. The critical values of each factor are established to effectively play the role of fire extinguishing. The results can provide reference for the design of fire extinguishing system of cable shaft of hydropower station.