Study on influence of air curtain on temperature and flow field of subway tunnel fires

doi:10.16265/j.cnki.issn 1003-3033.2021.07.022

Abstract

Abstract: In order to explore influence of air curtain on temperature and flow field distribution in subway tunnel, longitudinal temperature, maximum temperature of vault and flow field distribution in tunnel under different HRR(heat release rates) of fire source, air curtain jet velocities and angles were studied by FDS (Fire Dynamics Simulator). The results show that jet velocity of air curtain should be at least 16, 18 and 20 m/s to ensure smoke control effect when HRR is 10, 15 and 20 MW. Increasing jet angle, in cases where it is smaller than 45°, can accelerate temperature attenuation of vault, but such effect will be little as it is more than 45°. Maximum temperature of vault decreases along with increase of jet velocity, but increases with that of jet angle which changes temperature distribution in tunnel by influencing vortex between fire source and air curtain.

Key words: tunnel fire, air curtain, temperature distribution, maximum temperature of vault, flow field

CLC Number:

X928.7

TAO Liangliang, ZENG Yanhua, LIU Zhenhan, PENG Junqin, ZHOU Xiaohan. Study on influence of air curtain on temperature and flow field of subway tunnel fires[J]. China Safety Science Journal, 2021, 31(7): 157-163.

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