Prediction method of heat exhaust efficiency of centralized smoke exhaust system during tunnel fire

doi:10.16265/j.cnki.issn1003-3033.2023.07.2276

Abstract

Abstract:

In order to explore the impact of heat removal efficiency on the smoke exhaust performance of tunnel smoke exhaust systems during fires, this paper proposed a theoretical prediction method for the heat exhaust efficiency of tunnel centralized smoke exhaust system under fire conditions. The influences of various parameters on heat exhaust efficiency were analyzed. A series of experiments were carried out in a 1:20 scale model tunnel to verify the accuracy of the theoretical prediction results. Research shows that increasing the smoke exhaust volume of the centralized smoke exhaust system is the most effective means to improve the smoke exhaust capacity of the system. As the increase of the ignition sources power, the heat removal efficiency of the smoke exhaust system gradually decreases. The total heat removal efficiency of the system is less affected by parameters such as the spacing and size of smoke exhaust valves, cross-sectional area of smoke exhaust ducts and frictional resistance. However, in actual design and construction, it is necessary to consider the issue of reducing resistance and sealing to avoid excessive system resistance and reduce the smoke exhaust volume.

Key words: tunnel fire, centralized smoke, heat exhaust efficiency, ventilation network, smoke exhaust velocity

HE Lu, ZHANG Xiaojin, WANG Dongwei, ZHU Guoqing, YUAN Diping, XU Zhisheng. Prediction method of heat exhaust efficiency of centralized smoke exhaust system during tunnel fire[J]. China Safety Science Journal, 2023, 33(7): 113-120.

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排烟阀尺寸/m²	排烟阀间距/m	排烟道沿程阻力系数^[20]	排烟道截面积/m²	火源功率/ MW	总排烟量/ ( kg·s^-1)
2	20	0.02	5	10	60
4	40	0.07	10	20	120
6	60	0.12	15	30	180
8	80	0.17	20	40	240
10	100	0.22	25	50	300