上行通风火灾旁侧支路风流逆转FDS模拟研究

Validation of FDS for the flow reversal in bypass branch during ascensionally ventilated fire

以FDS模拟旁侧支路风流逆转,验证动态法的合理性。设计含有三条并联支路的通风网络为研究对象,一条为着火支路,另外两条为旁侧支路。根据支路长度和初始风速的不同组合方式,计算7个算例,比较各支路初始风速与长度的乘积与风流逆转时间的关系。结论:初始风速与长度的乘积小的旁侧支路先发生风流逆转。

The reversal of wind in bypass branch was simulated by FDS to confirm the reasonably of dynamic method.The object of simulation was vent net with 3 branch of an on fire branch and two bypass branches.7 samples were calculated with different length and wind speed.The relation between the product of length and wind speed was researched,and also the time of wind reversal. Result： The wind reversals first in the branch which has small product of length and wind speed.