补风方式对中庭类大空间建筑机械排烟效果的影响

Influence on the mechanical smoke exhaust effect by different air supply modes in large space building with atrium

采用数值模拟的方法研究机械排烟作用下自然补风和机械补风对中庭内烟气控制效果的影响。对于自然补风,改变补风口的总面积为4、8、12、16m2,对于机械补风,改变机械补风量为排烟量的25%、50%、75%和100%,分别研究补风口面积和补风量对排烟效果的影响。根据对不同工况下补风量、补风速度、中庭内温度分布以及烟气层高度等结果的分析可以得出:自然补风条件下,补风口面积越大,排烟效果越好;机械补风条件下,补风量达到排烟量的75%时能达到最好的排烟效果。

Numerical study was conducted on the mechanical smoke exhaust effect in atrium with natural air supply and me- chanical air supply, respectively. The area of natural air supply was changed as 4,8,12 and 16 m^2 , the volume of mechanical air supply was changed as 25%, 50%, 75% and 100% of smoke exhaust volume. Based on the analysis of air supply volume, air supply velocity, temperature distribution and smoke interface layer height, the conclusion was obtained that the larger the ar- ea of air supply, the better the smoke exhaust for natural air supply mode. While for mechanical air supply mode, when the volume of mechanical air supply was 75% of smoke exhaust volume, the smoke control results in the atrium are the best.