Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire

Li, J, Li, Y, Li, J, Zhong, H ORCID: https://orcid.org/0000-0001-9604-4523, Zhao, J and Xu, D, 2023. Experimental analysis of the effect of the ramp slopes on the maximum exceedance temperature in a branched tunnel fire. Tunnelling and Underground Space Technology, 131: 104829. ISSN 0886-7798

Preview

Text 1620029_Zhong.pdf Download (7MB) | Preview

Abstract

This research aims to establish a series of small-scale experiments to analyze the effect of ramp slopes on the temperature distribution of Liquefied Petroleum Gas (LPG) fire in a model branched tunnel under longitudinal ventilation. The heat release rate under experimental conditions reached 2.57 kW to 7.70 kW and five ramp slopes of 0 %, 3 %, 5 %, 7 % and 9 % were conducted. For a specific given bifurcation angle, the maximum exceedance temperature of the fire in the expanding region before the bifurcation angle is measured and analysed. Results show that the maximum exceedance temperature in the main tunnel increases as the ramp slope decreases, which is mainly because the stack effect enhances the entrainment of the air and accelerates the smoke flow. Furthermore, the modified model of the maximum exceedance temperature, which could consider the influence of ramp slope for a branch tunnel fire is established according to the experimental results. The predicted results agree well with those of the experimental study for the main tunnel. The results could provide a reference and contribute to the knowledge of smoke extraction strategies designed for branched tunnels.

Item Type:	Journal article
Publication Title:	Tunnelling and Underground Space Technology
Creators:	Li, J., Li, Y., Li, J., Zhong, H., Zhao, J. and Xu, D.
Publisher:	Elsevier
Date:	January 2023
Volume:	131
ISSN:	0886-7798
Identifiers:	Number Type 10.1016/j.tust.2022.104829 DOI S0886779822004692 Publisher Item Identifier 1620029 Other
Rights:	© 2022 the authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Divisions:	Schools > School of Architecture, Design and the Built Environment
Record created by:	Jonathan Gallacher
Date Added:	22 Nov 2022 13:32
Last Modified:	22 Nov 2022 13:33
URI:	https://irep.ntu.ac.uk/id/eprint/47471

Actions (login required)

Edit View

Statistics

Views

Downloads