Study on the effect of tunnel dimensions on the smoke layer thickness in naturally ventilated short tunnel fires

Lu He, Zhisheng Xu, Frank Markert, Jiaming Zhao, En Xie, Qiulin Liu, Haowen Tao, Sakepa Tagne Sylvain Marcial, Zhenhua Wang, Chuangang Fan*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Smoke layer thickness is a key parameter in tunnel fire research. In this paper, the effects of the dimensions of the tunnel cross-section and Heat Release Rate (HRR) in naturally ventilated short tunnel fires were studied. A series of numerical simulations with Fire Dynamics Simulator (FDS) were carried on, and some tunnel model experiments were conducted in a 1/10 scaled short tunnel model to verify the results of the numerical simulation. The thickness of smoke layer in the simulations and experiments was determined by the integral ratio method, which is more subjective and has been applied in FDS. The effects of different tunnel lengths and widths were studied. The results show that the smoke layer thickness increases with the increment of tunnel length, and conversely,
with the increased tunnel width, the thickness decreases. The HRR is also a main factor influencing the smoke
layer thickness, and with the increase in the HRR, the thickness increases. In addition, a prediction model of the
smoke layer thickness was proposed, which presented a good agreement with the results of simulation and
experiment.
Original languageEnglish
Article number103941
JournalTunnelling and Underground Space Technology
Volume112
Number of pages9
ISSN0886-7798
DOIs
Publication statusPublished - 2021

Keywords

  • Short tunnel fire
  • Natural ventilation
  • Smoke layer thickness
  • Integral ratio method
  • Numerical simulation
  • Model experiment

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