主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
Fire Science and Technology

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (7): 987-990.

Previous Articles     Next Articles

Study on fire behavior of cable cabins in utility tunnel under low oxygen concentration

LIU Xin1,2,3, ZHU Guo-qing1,2,3, XU Gang1,2,3   

  1. 1. China University of Mining and Technology, University Key Laboratory of Urban Underground Space Fire Protection, Jiangsu Xuzhou 221116, China; 2. Institute of Public Safety and Fire, China University of Mining and Technology, Jiangsu Xuzhou 221116, China; 3. Faculty of Safety Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221116,China
  • Online:2021-07-15 Published:2021-07-15

Abstract: In order to study the fire behavior of the cable cabins of the utility tunnel under low oxygen concentration, a low oxygen environment was formed by injecting liquid nitrogen. The cables were arranged at locations 0, 30 and 60 cm away from the center to carry out the scaled tube gallery test, and the test was compared with that under normal oxygen concentration.It is found that at low oxygen concentration, the flame area decreases, and the flame bending degree decreases when the fire source is near the side wall. After dimensionless treatment, the longitudinal temperature was fitted, and the empirical formula of longitudinal temperature attenuation at two oxygen concentrations was obtained. The maximum temperature in the transverse direction is near the ceiling position above the flame. The maximum temperature in the low oxygen concentration is lower than that under the normal oxygen concentration. When the fire source is near the side wall, the temperature difference increases due to the influence of the flame temperature.

Key words: utility tunnel, low oxygen concentration, longitudinal temperature filed, transverse temperature field