Experimental study on combustion parameters and temperature distribution of linear fire under different oxygen concentration in tunnel

Gang Xu, Guoqing Zhu*, Rongliang Pan, Xin Liu

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Many cables are placed in the underground utility tunnel, which are with greater fire hazards. Once fire occurs in an enclosed tunnel, thermal radiation may ignite the adjacent cables, which will cause cable fire and further expanding of fire scale, and oxygen will be consumed over time. Thus, it's important to investigate cable fire under low oxygen concentration. In this paper, a fire experiment has carried out in a reduced-scale enclosed tunnel with different heights of linear fire near the side wall. The combustion parameters, as well as transverse temperature distribution and maximum ceiling temperature rise under different oxygen concentration are investigated. Based on oxygen consumption calorimetry, the combustion efficiency and heat release rate of each fire source can be obtained. And two formulas to predict transverse temperature distribution and temperature rise under ceiling are proposed based on dimensionless analysis. Results show that different combustion parameters changing under varies oxygen concentrations, two temperature peaks exist in the cross section and the highest temperature is directly above the fire source. Conclusions are given to provide references in fire protection work in utility tunnel.

Original languageEnglish
Article number100272
Number of pages10
JournalResults in engineering
Volume11
DOIs
Publication statusPublished - Sept 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Combustion parameters
  • Oxygen concentration
  • Linear fire source
  • Transverse temperature distribution
  • Maximum ceiling temperature rise
  • FLAME CHARACTERISTICS
  • GAS TEMPERATURE
  • VENTILATION
  • BENEATH

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