Study on the roof fire characteristics of running train in a tunnel
Fan Xinyang, Tang Fei, Huang Yajun, Hu Longhua
In order to study the fire development characteristics of high-speed running train roof fires in subway tunnel, a series of moving fire experiments were conducted on a constructed downscaled tunnel train model, setting up different train running speeds and heat release rates, and full-scale numerical simulations were combined to reveal the evolution law of the fire characteristics of high-speed train roof fires in a tunnel（20～150 km/h）. The experimental results show that the maximum temperature on the train roof shows a trend of increasing and then decreasing with the increase of train running speed, in which the maximum temperature change reaches 205 °C; Moreover, with the increase of train running speed, the vertical flame height gradually decreases, and the horizontal flame length shows a trend of increasing and then decreasing, and the critical running speed increases with increasing heat release rate, which is verified by numerical simulation. Combined with the scaled-down experimental study, a segmented prediction model of the flame length of the roof fire of the running train in the tunnel was proposed.
(State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui Hefei 230026, China). Study on the roof fire characteristics of running train in a tunnel[J]. Fire Science and Technology, 2024, 43(9): 1286-1291.
