Experimental study on wall fire behavior produced by n-heptane pools with different aspect ratios and orientations in arched tunnel

Xin Liu; Guoqing Zhu; Rongliang Pan; Gang Xu; Lu He

Case Studies in Thermal Engineering (Dec 2021)

Experimental study on wall fire behavior produced by n-heptane pools with different aspect ratios and orientations in arched tunnel

Xin Liu,
Guoqing Zhu,
Rongliang Pan,
Gang Xu,
Lu He

Affiliations

Xin Liu: Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, China; Institute of Public Safety and Fire Engineering, China University of Mining and Technology, Xuzhou, 221116, China
Guoqing Zhu: Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, China; Institute of Public Safety and Fire Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Corresponding author. School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
Rongliang Pan: Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, China; Institute of Public Safety and Fire Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Department of Civil Engineering, Aalto University, FI-00076, AALTO, Finland
Gang Xu: Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, China; Institute of Public Safety and Fire Engineering, China University of Mining and Technology, Xuzhou, 221116, China
Lu He: Jiangsu Key Laboratory of Fire Safety in Urban Underground Space, China University of Mining and Technology, Xuzhou, 221116, China; Institute of Public Safety and Fire Engineering, China University of Mining and Technology, Xuzhou, 221116, China

Journal volume & issue: Vol. 28
p. 101438

Abstract

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A series of experiments were carried out in an arched tunnel (50 m long, 2 m wide, 2.3 m high). Under the influence of aspect ratios (1, 2 and 3) of oil pool and pool orientation relative to sidewall, the flame length and temperature distribution under the arched ceiling was studied. Oil pools with 3 aspect ratios were placed in the center as a control group. Results show that the pool orientation relative to sidewall is a decisive factor affecting the fire behavior. The heat release rate decreases with the aspect ratio increases. According to the physical meaning of flame extending along arched ceiling, the heat release rate is modified and prediction formula of transverse flame length under arched ceiling is obtained. The transverse temperature decay rate of different sections is different because of buoyant force. By modifying the transverse travelling distance, the prediction formula of the transverse temperature distribution is obtained, and the prediction error is within ±15%.

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/

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