CFD Simulation on Evacuation of a HighSpeed Train ContinuetoRoll During Long Tunnel Fires

Abstract:

Evacuation of highspeed train fires in tunnels is becoming a wide concerned issue.The paper first presents different modes of evacuation during train tunnel fires and discussion on the safety criteria of evacuations for passengers. Based on the computational fluid dynamics(CFD),a simulation test was made of the spread of gas temperature and smoke with time in tunnels and the railcars when a train continued rolling after a fire.The results show that the wind caused by the moving train controls the track of the gas and smoke of the fire.All the gas and smoke move downstream instead of moving upstream,so the upstream railcars are safe when the train continues rolling for evacuation,and the gas temperature and smoke in downstream railcars keep up increasing with time.The fire heart rease rate(HRR)and train velocity have important effects on the rate of gas and smoke spread in the downstream railcar during the evacuation.