热障效应对有顶步行街自然排烟的影响

发布时间：2018-10-17 18:18

【摘要】：为了研究热障效应对有顶商业步行街自然排烟的影响,采用理论分析与数值模拟相结合的方法,对不同高度及不同环境温度条件下有顶商业步行街自然排烟时顶棚附近的温度、能见度以及排烟效率进行了分析。结果表明:顶棚附近环境温度越高,自然排烟效果越差,自然排烟效率随顶棚热空气温度的升高呈现线性降低趋势;步行街高度越高,竖直方向的温度差越小,到达顶棚的烟气流速越小,排烟效率越低;当顶棚附近环境温度为45℃时,有顶商业步行街高度不宜超过35 m。
[Abstract]:In order to study the influence of thermal barrier effect on the natural smoke exhaust of commercial pedestrian street with roof, the temperature near the roof of commercial pedestrian street with roof under different height and different ambient temperature was studied by combining theoretical analysis and numerical simulation. Visibility and smoke efficiency were analyzed. The results show that the higher the ambient temperature near the roof, the worse the effect of natural smoke exhaust, and the lower the vertical temperature difference is, the lower the natural smoke exhaust efficiency is with the increase of the air temperature in the roof, and the higher the height of pedestrian street is, the smaller the vertical temperature difference is. When the ambient temperature near the ceiling is 45 鈩，

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