机械补风对体育场馆烟气运动的影响

Effects of mechanical air compensation on the smoke movements in large stadiums

基于FDS研究不同火源热释放速率下的补风口位置和补风量变化对大型体育场馆内烟气运动的影响。结果表明,适当提高补风量能够延缓烟气层下降速度,使场馆内达到的最高温度降低;补风口位于场馆下部时,顶棚区域所能达到的最高温度较低,烟气层下降速度较慢。此外,在实际烟气控制系统设计时,应注意补风气流不宜对火灾流场造成较大的扰动。

The effects of air compensation holes location and air compensation quantity on the smoke movements with different heat release rate in the large stadium were analyzed based on FDS.The results showed that the smoke layer would decline more slowly for the case of more air compensation,and lower the peak temperature in the stadium;the peak temperature near the stadium ceiling would be smaller when the air compensation holes are at lower positions,and the smoke layer would also decline more slowly.Finally,it should be noted that the air compensation should disturb the fire fume as little as possible.