大坡度隧道临界风速的数值模拟和实验研究

发布时间：2018-09-08 20:56

【摘要】：为解决坡度隧道临界风速存在的争议,以城市交通隧道的典型坡度构成为研究对象,通过数值模拟和搭建1∶8的坡度隧道模型实验台,对火灾工况中车辆沿坡度下行时的临界风速进行了研究,并与现有的较有影响力的2个临界风速模型"Kennedy模型和WuBakar模型的计算值进行了对比.研究结果表明:车辆沿坡度下行时,控制烟气回流所需的临界风速大于相同火灾场景中平直隧道的临界风速,且随着隧道坡度的增加,车辆沿坡度下行时的临界风速逐渐增大.综合数值模拟和模型实验的研究成果,对现有多数规范中推荐使用的Kennedy临界风速模型中的坡度修正系数进行了修正,得到了新的坡度修正系数.当隧道坡度在5%以上时,建议使用WuBakar临界风速模型进行烟气控制系统设计.
[Abstract]:In order to solve the controversy of critical wind speed in slope tunnel, taking the typical slope of urban traffic tunnel as the research object, the 1:8 slope tunnel model test bench was built through numerical simulation. In this paper, the critical wind speed of vehicle downhill along the slope is studied and compared with the calculated values of two influential critical wind speed models (Kennedy model and WuBakar model). The results show that the critical wind speed required to control flue gas reflux is greater than that of the straight tunnel in the same fire scene when the vehicle is descending along the slope, and with the increase of the slope of the tunnel, the critical wind speed increases gradually when the vehicle is descending along the slope. Based on the research results of numerical simulation and model experiments, the slope correction coefficient of Kennedy critical wind speed model, which is recommended for most of the existing specifications, is modified, and a new slope correction coefficient is obtained. When the tunnel slope is above 5%, it is suggested that the WuBakar critical wind speed model be used to design the flue gas control system.
【作者单位】：北京工业大学北京城市交通协同创新中心;绿色建筑环境与节能技术北京市重点实验室;天津市市政工程设计研究院;
【基金】：国家自然科学基金资助项目(51278018、51378040) 北京市自然科学基金资助项目(8132011)
【分类号】：U453.5

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