室外风对火灾烟气影响的试验研究  

Experimental study on the influence of outside wind on fire smoke

作　　者：梁振涛 Liang Zhentao(Changchun Fire and Rescue Division,Jilin Changchun 130000,China)

机构地区：[1]长春市消防救援支队,吉林长春130000

出　　处：《消防科学与技术》2023年第6期768-772,共5页Fire Science and Technology

基　　金：国家自然科学基金项目(51278493)。

摘　　要：为研究室外风对火灾烟气的影响,设计并搭建了多功能火灾烟气流动与控制试验台,通过模拟产生不同风速的室外风,开展室外风对烟气层温度、烟气生成量和烟气沉降情况影响的试验研究。研究结果表明:当室外风速小于0.75 m/s时,烟气层温度随风速的增加下降很快,但室外风速继续增大,烟气层温度下降速度变慢;顶棚烟气最高温度出现在下风向0.10~0.17个无量纲距离内,火源下风向的温度总体比上风向温度高;室外风会使烟气生成量明显增加,但随着室外风速的增加烟气生成量增加的速率越来越小;随着室外风速的增大,烟气层分界面的最大温度梯度逐渐减小,烟气层分界面越来越不清晰,烟气将充满整个空间。In order to study the influence of outside wind on fire smoke,multi-functional smoke movement and control experimental system was built.The effects of outside wind on smoke layer temperature,smoke production and smoke deposition were studied by simulating different wind speeds.The results showed that:when the wind speed is less than 0.75 m/s,the temperature of the smoke layer decreases rapidly with the increase of the wind speed,but when the wind speed increases again,the temperature of the smoke layer does not decrease slowly.The maximum temperature of smoke occurred in the range of 0.10~0.17 dimensionless distances in the downwind,and the temperature in the downwind of the fire source was generally higher than that in the upwind.The wind will greatly increase the smoke production,but with the increase of wind speed,the increasing rate of smoke production will become smaller and smaller.With the increase of wind speed,the maximum temperature gradient of the smoke layer interface decreases gradually,the smoke layer interface becomes more and more unclear,and the smoke will fill the whole space.

关 键 词：室外风 烟气层温度 烟气生成量 烟气层高度 高层建筑 

分 类 号：X913.4[环境科学与工程—安全科学] X932