Influence of mechanical smoke exhaust on smoke spread in underground tunnel

The model of a tunnel in Beijing is established, and the smoke reflux, the smoke reflux length and the influence of longitudinal wind speed on temperature distribution of the tunnel vault are studied using numerical simulation method. The length of the tunnel is 150 m, the cross section is circular,...

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Main Authors:	Hai jun Tao, Guoqing Zhu, Yu Xia, Yongchang Zhao
Format:	Article
Language:	English
Published:	Elsevier 2018-09-01
Series:	Case Studies in Thermal Engineering
Online Access:	http://www.sciencedirect.com/science/article/pii/S2214157X17302599

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spelling	doaj-85ff89979fc041129bcb895031f285542020-11-24T21:13:40ZengElsevierCase Studies in Thermal Engineering2214-157X2018-09-01124754Influence of mechanical smoke exhaust on smoke spread in underground tunnelHai jun Tao0Guoqing Zhu1Yu Xia2Yongchang Zhao3School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Fire Research institute, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Corresponding author at: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China.School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Fire Research institute, China University of Mining and Technology, Xuzhou 221116, Jiangsu, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Fire Research institute, China University of Mining and Technology, Xuzhou 221116, Jiangsu, ChinaSchool of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Key Laboratory of Gas and Fire Control for Coal Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China; Fire Research institute, China University of Mining and Technology, Xuzhou 221116, Jiangsu, ChinaThe model of a tunnel in Beijing is established, and the smoke reflux, the smoke reflux length and the influence of longitudinal wind speed on temperature distribution of the tunnel vault are studied using numerical simulation method. The length of the tunnel is 150 m, the cross section is circular, the height of the tunnel is 6.3 m and the width is 6 m. The simulation results show that the smoke reflux length of the subway tunnel fire decreases with the increase of the longitudinal positive pressure wind speed, and the reflux length decreases linearly with the increase of wind speed when the reflux length is more than 10 m. The gradient of the reflux length decreases with the increase of the wind speed when the distance from the fire source decreases. The temperature curve of tunnel vault is consistent. Under the same fire source heat release rate, the flue gas temperature decreases with the increase of ventilation wind speed, and the distance between the highest temperature of the ceiling and the fire source decreased with the increase of the longitudinal ventilation wind speed. Keywords: Smoke spread, Reflux length, Numerical simulationhttp://www.sciencedirect.com/science/article/pii/S2214157X17302599
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Hai jun Tao Guoqing Zhu Yu Xia Yongchang Zhao
spellingShingle	Hai jun Tao Guoqing Zhu Yu Xia Yongchang Zhao Influence of mechanical smoke exhaust on smoke spread in underground tunnel Case Studies in Thermal Engineering
author_facet	Hai jun Tao Guoqing Zhu Yu Xia Yongchang Zhao
author_sort	Hai jun Tao
title	Influence of mechanical smoke exhaust on smoke spread in underground tunnel
title_short	Influence of mechanical smoke exhaust on smoke spread in underground tunnel
title_full	Influence of mechanical smoke exhaust on smoke spread in underground tunnel
title_fullStr	Influence of mechanical smoke exhaust on smoke spread in underground tunnel
title_full_unstemmed	Influence of mechanical smoke exhaust on smoke spread in underground tunnel
title_sort	influence of mechanical smoke exhaust on smoke spread in underground tunnel
publisher	Elsevier
series	Case Studies in Thermal Engineering
issn	2214-157X
publishDate	2018-09-01
description	The model of a tunnel in Beijing is established, and the smoke reflux, the smoke reflux length and the influence of longitudinal wind speed on temperature distribution of the tunnel vault are studied using numerical simulation method. The length of the tunnel is 150 m, the cross section is circular, the height of the tunnel is 6.3 m and the width is 6 m. The simulation results show that the smoke reflux length of the subway tunnel fire decreases with the increase of the longitudinal positive pressure wind speed, and the reflux length decreases linearly with the increase of wind speed when the reflux length is more than 10 m. The gradient of the reflux length decreases with the increase of the wind speed when the distance from the fire source decreases. The temperature curve of tunnel vault is consistent. Under the same fire source heat release rate, the flue gas temperature decreases with the increase of ventilation wind speed, and the distance between the highest temperature of the ceiling and the fire source decreased with the increase of the longitudinal ventilation wind speed. Keywords: Smoke spread, Reflux length, Numerical simulation
url	http://www.sciencedirect.com/science/article/pii/S2214157X17302599
work_keys_str_mv	AT haijuntao influenceofmechanicalsmokeexhaustonsmokespreadinundergroundtunnel AT guoqingzhu influenceofmechanicalsmokeexhaustonsmokespreadinundergroundtunnel AT yuxia influenceofmechanicalsmokeexhaustonsmokespreadinundergroundtunnel AT yongchangzhao influenceofmechanicalsmokeexhaustonsmokespreadinundergroundtunnel
_version_	1716748431969484800

Influence of mechanical smoke exhaust on smoke spread in underground tunnel

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