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.