China Safety Science Journal ›› 2022, Vol. 32 ›› Issue (7): 93-97.doi: 10.16265/j.cnki.issn1003-3033.2022.07.2080

• Safety engineering technology • Previous Articles     Next Articles

Study on temperature and flame characteristics of ceiling jet induced by wall-attached fire in a tunnel

XU Tong1(), TANG Fei2,**(), HE Qing3   

  1. 1 Institute of Disaster Prevention Science and Safety Technology, Central South University, Changsha Hunan 410075, China
    2 State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei Anhui 230026, China
    3 School of Energy and Environment, Anhui University of Technology, Ma'anshan Anhui 243002, China
  • Received:2022-02-19 Revised:2022-05-16 Online:2022-08-12 Published:2023-01-28
  • Contact: TANG Fei

Abstract:

In order to study the ceiling jet characteristics induced by the wall-attached fire in a tunnel, tunnel fire experiments were conducted. Four rectangular fire sources with different aspect ratios were selected, and the influence of three source-ceiling distances and four heat release rates on flame spread and temperature distribution under celling were analyzed. The research found that with the increase in heat release rates and decrease of the source-ceiling distance, the temperature of the tunnel ceiling increases in both transverse and longitudinal directions. As the aspect ratio of the burner increases, the spread length and transverse temperature of ceiling jet transverse flame also increase, while the longitudinal flame length decreases. Meantime, the longitudinal flame length difference of different aspect ratios increases with the heat release rates, and the maximum value is 0.36 m.

Key words: tunnel fire, ceiling jet, wall-attached fire, temperature distribution, flame spread length