环境风对中庭自然排烟效果的影响研究

Study on influence of wind on the natural smoke exhaust of atrium

针对建筑火灾中环境风作用下自然排烟的问题,设置了不同的火灾场景,运用FDS软件模拟了火灾时步行街中庭内不同场景的烟气蔓延情况,分析了自然排烟窗的开启面积为26%,分别采用顶部、侧面及顶部加侧面3种开启方式在无风、风速5.6m/s和风速11.2m/s的条件时的火灾场景,获得了烟气温度、能见度和CO体积分数等参数,并对各个场景下的自然排烟效果进行了分析。结果表明,无风时,三种自然排烟方式的效果相差不大,外界侧向风对中庭侧窗自然排烟的影响较大。

Different fire scenarios were set to solve the natural smoke exhaust problem of building fire under environmental wind, and FDS was introduced to analysis the smoke movement during the building fire such as pedestrian street in the atrium. Three fire scenarios were designed, they have the same natural smoke exhaust windows as an open area 26%, and the open mode were set as top, side, and top-side, and the wind speed was set as 0, 5.6, 11.2 m/s. The flue gas temperature, visi- bility, the concentration of CO, and natural smoke exhaust effect of the various scenarios were simulated and analyzed. The results demonstrated that the three smoke exhaust modes with- out wind have no obvious difference, but the side wind has a huge effect on the side window natural smoke exhaust.