不同火源功率对列车火灾影响的FDS模拟与分析

FDS Simulation and Analysis of Different Fire Power Toward Train Fire Influence

以某高速检测列车为背景,采用美国NIST开发的大涡模拟软件,对列车运行速度为40 km/h时10、15、20、25 MW四种火源功率对列车火灾的影响进行数值模拟与分析.计算结果表明列车火灾可以达到的最大火灾热释放速率为20 MW,火源功率在10～20 MW之间时,改变火源功率对列车内的温度和烟气浓度影响不大.在车厢外壁将有1 000℃左右的高温区,因此列车防火还要考虑外壁的隔热性能.

Numerical Analysis of china high-speed train in fire with the large eddy simulation software FDS （ Fire Dynamic Simulator） developed by NIST. On the condition of the train speed is 40 km/h and the heat release rate is 10 MW, 15 MW,20 MW,25 MW respectively. Numerical simulation and analysis results show that the train fire in China high-speed vehicle, the maximum heat release is 20 MW. The heat release rate in the train can change the temperature and gas concentration and distributed, but with a little effect between the heat release rate 10 MW to 20 MW. Vehicle wall has a high temperature zone bout 1 000℃ ,therefore,the train must also consider the outer wall of fire protection.