کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7049972 | 1457163 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Measuring fire size in tunnels
ترجمه فارسی عنوان
اندازه گیری اندازه آتش در تونل ها
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کلمات کلیدی
آتش تونل، تهویه اندازه آتش، ایمنی آتش،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
A new measure of fire size Qâ² has been introduced in longitudinally ventilated tunnel as the ratio of flame height to the height of tunnel. The analysis in this article has shown that Qâ² controls both the critical velocity and the maximum ceiling temperature in the tunnel. Before the fire flame reaches tunnel ceiling (Qâ²Â < 1.0), Froude number Fr increases with Qâ², which is the typical trend of small tunnel fire. Once the flame height exceeds the height of tunnel (Qâ²Â > 1.0), Fr approaches a constant value. This is also a well-known phenomenon in large tunnel fires. Tunnel ceiling temperature shows the opposite trend. Before the fire flame reaches the ceiling, it increases very slowly with the fire size. Once the flame has hit the ceiling of tunnel, temperature rises rapidly with Qâ². The good agreement between the current prediction and three different sets of experimental data has demonstrated that the theory has correctly modelled the relation among the heat release rate of fire, ventilation flow and the height of tunnel. From design point of view, the theoretical maximum of critical velocity for a given tunnel can help to prevent oversized ventilation system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 59, Issues 1â2, 25 September 2013, Pages 101-105
Journal: Applied Thermal Engineering - Volume 59, Issues 1â2, 25 September 2013, Pages 101-105
نویسندگان
Xiaoping Guo, Qihui Zhang,