Smoke movement in a tunnel of a running metro train on fire
来源期刊：中南大学学报(英文版)2015年第1期
论文作者：ZHOU Dan(周丹) TIAN Hong-qi(田红旗) ZHENG Jin-li(郑晋丽) YAN Xin(颜鑫)
文章页码：208 - 213
Key words：subway tunnel; train catching fire; moving fire source; smoke movement; ventilation control
Abstract: Research on the distribution of smoke in tunnels is significant for the fire emergency rescue after an operating metro train catches fire. A dynamic grid technique was adopted to research the law of smoke flow diffusion inside the tunnel when the bottom of a metro train was on fire and to compare the effect of longitudinal ventilation modes on the smoke motion when the burning train stopped. Research results show that the slipstream curves around the train obtained by numerical simulation are consistent with experimental data. When the train decelerates, the smoke flow first extends to the tail of the train. With the decrease of the train’s speed, the smoke flow diffuses to the head of the train. After the train stops, the slipstream around the train formed in the process of train operation plays a leading role in the smoke diffusion in the tunnel. The smoke flow quickly diffuses to the domain in front of the train. After forward mechanical ventilation is provided, the smoke flow inside the tunnel continues to diffuse downstream. When reverse mechanical ventilation operates, the smoke in front of the train flows back rapidly and diffuses to the rear of the train.
ZHOU Dan(周丹)1, TIAN Hong-qi(田红旗)1, ZHENG Jin-li(郑晋丽)2, YAN Xin(颜鑫)1
(1. Key Laboratory of Traffic Safety on Track of Ministry of Education
(School of Traffic and Transportation Engineering, Central South University), Changsha 410075, China;
2. Shanghai Tunnel Engineering & Rail Transit Design and Research Institute, Shanghai 200235, China)
Abstract:Research on the distribution of smoke in tunnels is significant for the fire emergency rescue after an operating metro train catches fire. A dynamic grid technique was adopted to research the law of smoke flow diffusion inside the tunnel when the bottom of a metro train was on fire and to compare the effect of longitudinal ventilation modes on the smoke motion when the burning train stopped. Research results show that the slipstream curves around the train obtained by numerical simulation are consistent with experimental data. When the train decelerates, the smoke flow first extends to the tail of the train. With the decrease of the train’s speed, the smoke flow diffuses to the head of the train. After the train stops, the slipstream around the train formed in the process of train operation plays a leading role in the smoke diffusion in the tunnel. The smoke flow quickly diffuses to the domain in front of the train. After forward mechanical ventilation is provided, the smoke flow inside the tunnel continues to diffuse downstream. When reverse mechanical ventilation operates, the smoke in front of the train flows back rapidly and diffuses to the rear of the train.
Key words:subway tunnel; train catching fire; moving fire source; smoke movement; ventilation control
