巷道木材火灾试验与数值模拟对比研究

通过应用煤炭科学研究总院重庆研究院某水平巷道全尺寸木材火灾实验和流体力学软件FULENT的数值模拟方法,研究风速为0.7m/s和1.1m/s时8,00kg木材燃烧以及风速为0.7m/s时,400kg木材燃烧火源下风侧各热物理参数变化规律。结果表明:3次燃烧试验和模拟均为富氧燃烧类型,验证了A.罗伯特燃烧判定准则的正确性。同时试验和模拟火源下风侧CO,CH4和H2危害性气体浓度和出口风门处温度,对比结果证明,巷道富氧类燃烧难以产生次生灾害。研究也表明,环境因素或巷道物理结构变化能改变巷道火灾燃烧类型。

Experimental and Numerical Analysis of Wood Combustion in Tunnel

By conducting full-scale wood fire experiments of tunnel system in Chongqing Institute of Coal Science Research Institute and making numerical simulations with fluid dynamics software FLUENT,the changing rule of thermal physical parameters was studied when 800 kg wood burned at the wind speed of 0.7 m/s and 1.1 m/s respectively,and 400 kg wood burned at the wind speed of 0.7 m/s.The results show that the three combustion experiments and simulations are oxygen-enriched combustion,which verifies the correctness of A.Robert burning theory.Furthermore,the experiments and simulations also meas-ured the temperatures at the end of the tunnel and the concentrations of hazardous gases such as CO,CH4 and H2 at the downwind of the fire.Comparative study on the results indicates that it is difficult for oxygen-enriched combustion to cause secondary disasters in tunnel,and the change of environmental factors or tunnel's physical structure can lead to the change of fire type.