关键词: 地铁, 列车火灾, 温度, 顶棚射流, 模型实验, 数值模拟

Abstract:

In this paper, 1：8 scale model experiments and numerical simulations were performed to analyze the temperature characteristics of flame ceiling jet generated by a fire at the head and the tail of a train in a subway tunnel. The results were then compared with those at the train center. It is found out that, if the fire occurs at the train head and tail, the maximum temperature of the flame ceiling jet appears at the location of δ= 0. 25H away from the tunnel roof, while it appears at the location of δ= 0. 18H if the fire occurs at the train center, all these being different from that of the gas ceiling jet appearing at the location of 0. 01H away from the tunnel roof; that the vertical temperature along the tunnel changes piecewise under a stable combustion state, so the maximum temperature at the fire on the train head and tail reduces parabolically, while that at the fire on the train center reduces linearly; and that, being a certain distance away from the train, the flame significantly weakens, and the maximum temperature of the flame ceiling jet exhibits an exponential decay.

Key words: subway, train fire, ceiling jet , model experiment, numerical simulation