着火房间窗口宽度对烟溢流行为影响研究

Influence of the window's width of the fire room on the smoke overflow behavior

为探究窗口宽度对高层建筑火灾窗口烟溢流行为变化的影响规律,以南京市某写字楼为模型,应用FDS对此高层建筑室内火灾时窗口烟气溢流的行为进行研究。火源位于房间中央,功率为1 500kW。改变窗口宽度,设置6个工况,分析窗口处气体的质量流率、温度、速度的变化。结果表明,不同窗口宽度下烟气溢流的行为符合一定的变化规律。随着窗口宽度的减小,窗口处中性面的高度抬升,流出烟气的质量流率减小,温度降低,并且发生烟溢流的时间推迟。通过理论分析计算验证了模拟结果。

In order to explore the influence of the window＇ width on the change of smoke overflow in high-rise buildings fires, an office building in Nanjing was selected as the model background. FDS was used to simulate the change rule of the smoke overflow in the high-rise building fires. The fire source with 1 500 kW located at the middle of room. Six scenarios with different width of window were set to analyze the change of mass flow rate, temperature and current velocity. The result showed that the behavior of flue gas overflow under different o- penings had certain regularity. With the decrease of the window width, the neutral surface of window raised up, and the mass flow rate of smoke outflow reduced gradually, the temperature decreased gradually and smoke outflow time delayed gradually. Through theoretical analysis and calculation, the simulation re sults were validated.