根据相对运动原理,建立1∶4的缩尺寸模型,采用变频风机提供风速模拟列车在隧道中的运动.基于热失重法开展不同速度运行的铁路货车发生火灾时的热释放速率测定试验,得到热释放速率曲线.研究结果表明:控制燃烧环境的条件下,采用单角点火,随着铁路货车运行速度的增加,火灾热释放速率的最大值随之增加,到达最大值的时间逐渐减小,同时火灾增长速率增加;铁路货车从隧道入口着火后运行到隧道救援站过程中,为了保证安全,应适当降低运行速度.%According to the principle of relative motion,by small size model of 1∶4,the frequency conversion fan was used to provide the wind to simulate the movement of the train in the tunnel.Based on the thermogravimetry method,the heat release rates (HRR) of railway freight trains at different speeds were researched and the curves of HRR with time were obtained.The research results showed that when combustion environment was controlled,and for the single corner ignition,the faster the driving speed,the lager the peak value of HRR,the faster the reaching of the peak value of HRR,and the greater the fire growth rate.To be safety,the driving speed of railway freight trains in fire should be reduced during the driving from the tunnel entrance to the tunnel rescue station.
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