Investigation on temperature distribution under the coupling action of transverse position and fire sealing of linear fire in tunnel

Gang Xu; Guoqing Zhu; Rongliang Pan; Xin Liu

Case Studies in Thermal Engineering (Aug 2021)

Investigation on temperature distribution under the coupling action of transverse position and fire sealing of linear fire in tunnel

Gang Xu,
Guoqing Zhu,
Rongliang Pan,
Xin Liu

Affiliations

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
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
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

Journal volume & issue: Vol. 26
p. 101032

Abstract

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By sealing the portal at one end of tunnel and changing the transverse location of linear fire source in tunnel, the hot smoke layer, longitudinal temperature distribution and maximum temperature of linear fire source were investigated. It is found that the flame will bend under the influence of curved ceiling and hot smoke layer will be thicker when the linear fire source approaches to the side wall. The variation law of heat release rate is analyzed by considering the limiting effect of side wall and thermal feedback. By modifying the previous formula of effective ceiling height, an empirical formula for predicting longitudinal temperature distribution of linear fire sources with different aspect ratios is proposed, and the ventilation coefficient is obtained to characterized the temperature under sealing and without sealing. Moreover, the accuracy of predicted temperature under sealing is verified by using the ventilation coefficient. Based on dimensional analysis, it's concluded that the maximum temperature mainly depends on the heat release rate, and an empirical formula is proposed to predict the maximum temperature rise of linear fire sources with different aspect ratios in several transverse positions. The error of predicted values and actual values is within 13%.

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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