水喷淋作用下建筑通道烟气蔓延特性模拟研究

采用数值模拟研究在单喷淋作用下建筑通道内烟气的蔓延特性,并对不同喷淋压力条件下烟气质量流量、温度及CO体积分数随时间的变化进行对比,对引起喷淋作用下烟气蔓延速度及烟气成分浓度变化的主要原因进行了分析。结果表明,增加喷淋压力对烟气的降温作用增强,降低了烟气在通道内的蔓延速度;同时,喷淋引起的烟气拥塞增加了流出喷淋覆盖区的烟气的CO体积分数,使得烟气毒性加大。

Numerical Investigation on Smoke Spreading Character under Sprinkler Spray in Building Corridor

Numerical simulations were carried out for investigating the spreading character of fire smoke in building corridor under water spray. By changing the operating pressure of sprinkler, the spray model, mass flux, temperature and CO concentration of the smoke were recorded. Based on the simulation results, the impact of sprinkler spray on smoke spreading velocity as well as CO concentration was analyzed. The results show that the cooling effect of the sprinkler spray increases with the increasing of the operating pressure, which leads to the decrease of smoke temperature and the drop of the velocity of smoke flow in corridor. Simultaneously, the CO concentration will rise in spray region due to the congestion of the smoke caused by the spray.