Study On The Smoke Flow Control Technology Of Intercity Train Carrying Fire Into The Underground Station In Railway Tunnel

In recent years,the intercity railway has a rapid development in China.Due to the line standards,land resources and other factors,there will inevitably be a large number of tunnels and tunnel groups.In view of the catastrophic consequences of train fire,to carry out intercity railway tunnel related disaster prevention and rescue technology research is particularly urgent and important.The characteristics of intercity railway tunnel are between mountain railway tunnel and subway,the station spacing is 5～20km,if the train can not be pulled out the tunnel after the fire,the underground station has become the best emergency evacuation place,so this paper uses the method of theoretical analysis,field investigation and numerical calculation to study the smoke flow control technology of intercity railway train carrying fire into the underground station.The main results are as follows:1.Based on the method of theoretical analysis and on-the-spot investigation,the anti-smoke extraction system of underground station and the simulation technology of the train carrying fire into station are carried out.The mode of anti-smoke extraction in the underground station is proved.The scale of fire and the generation rate of flue gas are determined,the simulation technology of the train carrying fire into the underground station is put forward.2.Based on the dynamic grid technology and the three-dimensional incompressible Navier-Stokes equations,the turbulence model,the radiation model and the component transport model are used to establish the numerical model of the train carrying fire into station.This paper analyzes the law of smoke diffusion and its influence scope with or without platform screen door,and studies the crack behavior of the platform screen door glass under the fire condition,the distribution law of the temperature.field in the case of the platform screen door is obtained.3.Based on the theory of unsteady flow,the analytical solution of the piston wind speed is deduced.The relationship between the speed of the train and the wind is obtained.The method of numerical simulation is used to analyze the decay process of the piston wind,the wind speed,the pressure and the temperature variation rule of the valve during the train carrying fire into station is put forward,and the influence law of the piston wind on the exhaust efficiency and exhaust heat efficiency of the exhaust valve is determined.4.Considering the influence of behavioral characteristics such as psychological,physiological,personnel composition and velocity on the evacuation time during fire scenario,the correction coefficient based on the characteristics of personnel behavior is put forward,and the calculation method of evacuation time of underground station is established.