海底隧道背负式列车火灾热释放速率研究

Research on fire heat release rate of piggyback train in submarine tunnel

介绍汽车燃烧热辐射理论和烟气辐射理论。建立基于汽车燃烧热辐射和烟气辐射的受限空间内汽车间引燃模型,讨论不同火源位置对背负式列车车厢火灾热释放速率的影响。针对凹底双层(SQ6型)背负式列车的车型结构,设计火灾热释放速率理论计算模型。车厢内下层汽车横向引燃仅需考虑着火汽车的辐射作用,上层汽车引燃需要同时考虑热烟辐射作用。针对SQ6型背负式列车,绘制不同火源位置下汽车燃烧的热释放速率曲线。研究结果表明:背负式列车火灾最大热释放速率约为11 MW,且下层汽车燃烧引发的火灾的最大热释放速率大于上层相同位置的汽车火灾,位于中部汽车燃烧引发的火灾的最大热释放速率值大于车厢端部汽车引发的火灾。

The theory of heat radiation and smoke radiation of automobile combustion was introduced.The vehicle ignition model under confined space was created based on the vehicle burning ther^mal radiation and gas radiation.The influence of different fire sources on the heat release rate of the fire in the train compartment was discussed.The calculation model of heat release rate was de*signed for concave bottom double-layer piggyback train(SQ6 type).The lateral ignition of vehicle in lower layer was only affected by thermal radiation of vehicle on fire,and the vehicle in upper layer would be ignited under the common effect of vehicle thermal radiation and gas radiation.The heat release rate curves of SQ6 piggyback train under different fire source positions were plotted.The results showed that the maximum heat release rate of the piggyback train fire was about 11 MW,and the maximum heat release rate of the fire caused by vehicle in lower layer was greater than that of vehicle in the same position in upper layer.The maximum heat release rate caused by the vehicle in middle part of the train was greater than that in the end of train.