隧道集中排烟速率对烟气层吸穿现象影响的试验研究

发布时间：2018-03-10 08:54

本文选题：排烟速率　切入点：集中排烟　出处：《中国安全科学学报》2014年09期 　论文类型：期刊论文

【摘要】：建立1∶20的缩尺寸隧道模型,以研究隧道集中排烟速率对烟气层吸穿现象的影响。分析对称开启的6个排烟口,排烟速率由0.045 m3/s逐渐增大到0.179 m3/s时,排烟口下方烟气层蔓延范围、厚度和温度的变化规律。在不同排烟速率下,邻近火源的排烟口L1和R1均未发生吸穿现象;而远离火源的排烟口L3和R3排出的几乎为空气;在排烟速率为0.112~0.179 m3/s时,处于中间位置的排烟口L2和R2发生吸穿过渡现象,后随排烟速率增大则发生完全吸穿现象。结果表明:当隧道集中排烟速率不断增大时,排烟口下方烟气层逐渐发生吸穿现象,且距火源越远的排烟口越容易发生吸穿现象。
[Abstract]:In order to study the influence of the concentrated exhaust rate of the tunnel on the smoke layer penetration phenomenon, a 1:20 tunnel model was established to study the smoke layer spread range under the smoke exhaust layer, when the smoke exhaust rate increased from 0.045 m3 / s to 0.179 m3 / s, and the smoke exhaust rate was increased from 0.045 m3 / s to 0.179 M3 / s. The variation of thickness and temperature. Under different exhaust rates, there was no penetration of L1 and R1 in the nearby smoke outlet, but the air was almost the air in the outlet L3 and R3 far away from the fire source, and when the smoke exhaust rate was 0.112 ~ 0.179 m3 / s, L2 and R2 in the middle position take place the phenomenon of sucking through, and then with the increase of the exhaust rate, the phenomenon of completely sucking through occurs. The results show that the smoke layer below the exhaust outlet gradually takes place when the rate of concentrated exhaust smoke in the tunnel increases. And the farther away from the fire, the more easily the smoke outlet will be sucked.
【作者单位】：武汉科技大学资源与环境工程学院;北京工业大学建筑工程学院北京100022;中国科学技术大学火灾科学国家重点试验室;中南大学土木工程学院;
【基金】：中国博士后科学基金资助(2013M540830) 北京市博士后科研活动经费资助项目(2013ZZ-02) 中国科学技术大学火灾科学国家重点试验室开放课题项目(HZ2013-KF01)
【分类号】：U453.5;U456

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