Fire smoke spread characteristics of T-shaped bifurcated tunnel under longitudinal ventilation

doi:10.16265/j.cnki.issn1003-3033.2022.10.1590

Abstract

Abstract:

In order to study the characteristics of fire smoke spread in T-shaped bifurcated tunnels under longitudinal ventilation， a full-scale numerical model of the bifurcated tunnel was established using fire dynamics simulation（FDS） numerical simulation software. By changing different longitudinal ventilation and heat release rates， the temperature distribution and smoke flow characteristics were studied. The results show that： With the increase of longitudinal ventilation， the upstream fire smoke temperature in the bifurcated tunnel decreases first and then increases， and the velocity field in the bifurcated tunnel changes from inclined to upstream of the fire source to inclined to downstream of the fire source. The maximum smoke temperature in the main tunnel increases first and then decreases with the increase of longitudinal ventilation. The turning longitudinal ventilation speed is 2 m/s， and the maximum temperature of fire smoke is basically near the fire source. The smoke spread front in the main tunnel gradually moves downstream with the increase of longitudinal ventilation speed. When the longitudinal ventilation speed is 3 m/s， the smoke spread front is close to the fire source area.

Key words: longitudinal ventilation, T-shaped bifurcated tunnel, smoke spread, temperature distribution, numerical simulation

YAO Yongzheng, SONG Kebin, SHI Congling, REN Fei, LI Jian, CHE Honglei. Fire smoke spread characteristics of T-shaped bifurcated tunnel under longitudinal ventilation[J]. China Safety Science Journal, 2022, 32(10): 115-120.

Figures/Tables 10

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工况序号	热释放速率/MW	纵向通风风速/（m·s^-1）
1—4	5	0， 1， 2， 3
5—11	7.5	0， 1， 2， 3， 5， 10， 11
12—15	10	0， 1， 2， 3

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