摘要
采用CFD方法运用κ-ε双方程模型对半敞开式隧道着火时烟气扩散情况进行模拟,比较不同季节时的自然通风效果。结果表明,冬夏两季时隧道采用自然通风的排烟模式是切实可行的,都能起到很好的排烟作用。火灾前期烟气扩散速度远大于火灾后期,冬季烟气水平扩散速度高于夏季,但烟气沉降冬季比夏季严重,且冬季自然排烟效率比夏季提高了3.5%;夏季隧道顶部最高温度高于冬季,且火源两侧高温区域大于冬季。
In the tunnel fires,the most immediate threat to passengers＇ life is not the direct exposure to fire,but the smoke inhalation because it contains hot air and toxic gases,so it＇s important to research the efficient smoke control models.In this paper,the smoke diffusion was simulated in the half-open-tunnel fire by CFD and usingκ-εtypes of three-dimension turbulence model,effects of natural ventilation in different seasons were compared.And the results indicated that the natural ventilation worked well in different seasons.In the prophase the smoke diffused faster than in the anaphase.In the winter the velocity of smoke diffusion was bigger than in the summer,and the efficiency of smoke-exhausting was also raised by 3.5%,but the smoke fell lower than in the summer.The temperature on the top of the tunnel in the summer was higher than in the winter,so was the bilateral area of high temperature.
出处
《建筑科学》
北大核心
2009年第3期88-90,100,共4页
Building Science
关键词
隧道
火灾
烟气
自然通风
tunnel
fire
smoke
natural ventilation
作者简介
诸德志（1962-），男，博士生，高级工程师 laotian886@163．com
