排烟方式对大空间建筑火灾空气升温的影响

Effect of Smoke Emission System on Fire Temperature Rise in Large Space Structures

为了考察烟气排放对大空间建筑火灾温度场的影响,利用FDS程序仿真模拟了火灾场景,系统分析了不同排烟系统对温度场的影响。结果表明:烟气排放对温度的影响较大,最大降温幅度可达原最高温度的50%左右;降温幅度与建筑高度有密切联系;当建筑高度小于12m时,按规范设计的自然排烟系统下的火场温度低于机械排烟的火场温度;当建筑高度达到或超过12m时,自然排烟系统下的火场温度将接近或高于机械排烟的火场温度。

In order to find out effect of smoke emission on fire temperature field of large space structures, computer simulation was performed by FDS program for fire cases of different smoke emission systems. The results show that the smoke emission can result in large difference for fire temperature field.Maximum drop of temperature could reach 50%of primary highest fire temperature.And the range of temperature reduction is closely linked with the height of building.When the height is under 12 m,the fire temperature with natural smoke emission system is below that with mechanical emission system.However, when the height is over 12 m,the fire temperature with natural smoke emission system will be close to or higher than that with mechanical emission system.