L 型挡烟垂壁的防烟效果研究

摘要

To study the best effect of L -type hang-wall ,in this paper ,the FDS is used to simulate 20 cases .Two impor-tant parameters of L -type hang-wall that are the length of horizontal part of L -type hang -wall and distance between smoke exhaust port and the hang -wall are studied .Under the premise of not increasing the amount of smoke ,the smoke prevention effects are compared in different length of horizontal part of L -type hang-wall and distance between the exhaust port and the L-type hang-wall .The simulation shows that case 15 is optimal ,that is ,the length of horizontal part of L -type hang -wall is 0 .9 m and the distance between smoke exhaust port and the hang -wall is 1 .5 m .In this case ,the smoke temperature at the height of the human eye (1 .6 m) is in safe .Compared with the traditional hang -wall ,named case 3 ,under the same conditions ,case 15 can reduce the heat going into the atria by 40% .%为研究L型挡烟垂壁的最佳挡烟效果，采用FDS模拟了20种工况，对L型挡烟垂壁的两个关键参数，即挡烟垂壁的下部延伸长度和排烟口到挡烟垂壁之间的距离进行研究。在不增加排烟量的前提下，比较不同的挡烟垂壁下部延伸长度和排烟口到挡烟垂壁之间的距离的防烟效果。由各种模式下的模拟结果可知，最佳工况为工况15，即下部延伸长度为0．9m，排烟口到挡烟垂壁之间的距离为1．5m，在此工况下走廊在人眼特征高度处的烟气温度始终处于安全范围内。对比相同条件下的传统挡烟垂壁即工况3，工况15可以减少40％的热量进入前室。