Journal of South China University of Technology (Natural Science Edition) ›› 2016, Vol. 44 ›› Issue (6): 129-136.doi: 10.3969/j.issn.1000-565X.2016.06.020

• Traffic & Transportation Engineering • Previous Articles     Next Articles

Characteristics of Smoke in Tunnel with On-Fire Train Moving in Subway Tunnel

XI Yan-hong MAO Jun BAI Guang HU Jia-wei   

  1. School of Civil Engineering and Architecture//Beijing Key Laboratory of Track Engineering,Beijing Jiaotong University,Beijing 100044,China
  • Received:2015-09-16 Revised:2015-11-28 Online:2016-06-25 Published:2016-05-03
  • Contact: 郗艳红(1980-)，女，博士后，讲师，主要从事火灾安全、高速列车空气动力学与行车安全等的研究． E-mail:yhxi@bjtu.edu.cn
  • About author:郗艳红(1980-)，女，博士后，讲师，主要从事火灾安全、高速列车空气动力学与行车安全等的研究．
  • Supported by:
    Supported by the National Natural Science Foundation of China(51308040，51578061，51078031)，Research Fund for the Doctoral Program of Higher Education of China(20130009120024) and Beijing Municipal Science and Technology Plan Projects(Z131100004513010)

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Abstract: Ensuring the safety of the on-fire train moving in a subway tunnel is the goal of the corresponding emer- gency rescue.In this paper,with the help of STAR-CCM + possessing the function of mesh sliding,CFD (Com- putational Fluid Dynamics) simulations are carried out to investigate the effects of train speed and heat release rate on the smoke characteristics in a tunnel,and the distribution of smoke temperature as well as the optimal speed of the on-fire train traveling in the tunnel are explored.The results show that (1) for the on-fire train moving in a subway tunnel，there is an optimal speed corresponding to the lowest temperature,namely 50 km/h; (2) when the train moves at a constant speed,the temperature peak at the typical eye points increases with the heat release rate; (3) at a constant heat release rate,the maximum temperature first decreases and then increases with the train speed,presenting an upward parabola; (4) the temperature at the train roof inlet gradually increases when the on-fire train moves forward in the tunnel,and the maximum temperature is of a large oscillation on the neutral surface; (5) the minimum temperature (166. 45 ℃) occurs at 340 m in the tunnel; and (6) the train might be burnt due to the high temperature at the train top,so that a ventilation measure should be adopted to reduce the temperature of the annular tunnel space when a subway train is on fire.

Key words: subway tunnel, train fire, smoke characteristic, numerical simulation, heat release rate, temperature

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