Study on smoke flow characteristics in immersed tunnel fires with lateral centralized exhaust: Considering the effect of the slope

Yuyang Ming; Guoqing Zhu; Lu He; Yuhang Zhou; Xin Liu; Xinyu Wang; Guangyuan Wang; Jinhu Ding

Case Studies in Thermal Engineering (Nov 2023)

Study on smoke flow characteristics in immersed tunnel fires with lateral centralized exhaust: Considering the effect of the slope

Yuyang Ming,
Guoqing Zhu,
Lu He,
Yuhang Zhou,
Xin Liu,
Xinyu Wang,
Guangyuan Wang,
Jinhu Ding

Affiliations

Yuyang Ming: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China
Guoqing Zhu: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China; Corresponding author. School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
Lu He: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China
Yuhang Zhou: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China
Xin Liu: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China
Xinyu Wang: School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China
Guangyuan Wang: First Company of China Construction Eighth Engineering Division Ltd, LiXia District, Jinan, 250014, China
Jinhu Ding: Property Branch of Huaibei Mining (Group) Co., Ltd, Huaibei, 235000, China

Journal volume & issue: Vol. 51
p. 103511

Abstract

Read online

In the case of fires in inclined immersed tunnels, smoke flow patterns differ from those of horizontal tunnels, and require a unique approach to lateral centralized smoke exhaust. In this study, we propose a prediction model for the exhausted mass flow rate near each vent and use Fire Dynamics Simulator (FDS) to analyze the flow field and components. Our findings indicate that temperature and smoke velocity distributions follow exponential decay with varying slopes, with exhaust efficiency and entrainment coefficient first increasing then decreasing at 1% and 2% slopes, and continuously decreasing at 3%, 4%, and 5% slopes. Only at a 6% slope can the smoke reach the nearest vent. Exhausted mass flow rate and exhaust volume have a positive correlation, and calculated values and simulated results agree well. This study can guide the design and management of lateral centralized smoke exhaust systems for inclined tunnels.

Published in Case Studies in Thermal Engineering

ISSN: 2214-157X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/case-studies-in-thermal-engineering/

About the journal

Abstract

Keywords