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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。
The effects of natural makeup air and mechanical makeup air on the flue gas control effect in the atrium were investigated by numerical simulation. For the natural make-up, change the total area of the make-up air outlet is 4,8,12,16 m2, for mechanical make-up air, change the mechanical make-up air volume to 25%, 50%, 75% and 100% Effect of Area and Replenishment Air Volume on Smoke Exhaust Efficiency. Based on the analysis of the results of the air supply, air supply, temperature distribution in the atrium and the height of the flue gas layer under different conditions, it can be concluded that the larger the air outlet area is, the better the exhaust effect is. Wind conditions, up to 75% of the amount of exhaust gas to achieve the best smoke exhaust effect.