Effects of ambient pressure on smoke movement and temperature distribution in inclined tunnel fires

被引：68

作者：

Ji, Jie ^{[1
,2
]}

Wang, Zhiyong ^{[1
]}

Ding, Long ^{[1
]}

Yu, Longxing ^{[1
]}

Gao, Zihe ^{[1
]}

Wan, Huaxian ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Fire Sci, JinZhai Rd 96, Hefei 230026, Anhui, Peoples R China

[2] Natl & Local Joint Engn Res Ctr Thermal Safety Te, Hefei 230026, Anhui, Peoples R China

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2019年 / 145卷

基金：

中国国家自然科学基金;

关键词：

Inclined tunnel fires; Ambient pressure; Smoke movement; Temperature distribution; Stack effect; Maximum smoke excess temperature; CEILING GAS TEMPERATURE; AIR ENTRAINMENT; ROAD TUNNEL; MAXIMUM TEMPERATURE; JET; SIMULATION; SIDEWALL; PROFILE; BENEATH; FLOW;

D O I：

10.1016/j.ijthermalsci.2019.106006

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A series of simulations with regard to inclined road tunnel were conducted to investigate the effect of ambient pressure on smoke movement and temperature distribution. The tunnel slope and ambient pressure were systematically changed. When a fire breaks out in an inclined tunnel, the thermal buoyancy induced by smoke temperature difference will induce an airflow through the tunnel due to the stack effect. The induced longitudinal airflow is a key factor in inclined tunnel fires. Under the combined effect of induced longitudinal airflow and ambient pressure, the smoke movement and temperature distribution pattern are presented firstly. Then the variation of induced longitudinal airflow velocity with tunnel slope and ambient pressure is explained. Finally, taking the tunnel slope, the ambient pressure and the velocity of resulted induced longitudinal airflow into account, a correlation predicting the maximum smoke excess temperature beneath the ceiling is proposed. Moreover, the correlation agrees well with previous experimental results at normal pressure. The results can provide an engineering reference for tunnel structural fire protection, smoke control and safe evacuation in inclined tunnels at different ambient pressures.

引用

页数：11

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