Study on the Smoke Characteristics of Early Fire on a Running Train in the Tunnel
Research purposes:Figuring out the characteristics of early smoke flow from a running train fire is the foundation of fire detection,location and warning.Based on the numerical simulation model of train fire,six different-location-fire models of roof,bottom,front,middle and rear of 120 km/h running train are used to study the variation of air temperature and smoke concentration at different times.Research conclusions:(1)The smoke is asymmetrically distributed,and tends to spread to the rear,it can not detect the changes in temperature and smoke concentration from 1 m distance ahead of the fire.(2)The real-time monitoring values of temperature and smoke concentration are negatively correlated with the distance from fire source,and the air temperature of an under-train-fire is 100％ higher than that of a fire on the roof,and the smoke concentration is 500％ higher.(3)The relative velocity has little influence on the absolute temperature ratio.The absolute temperature ratio is greater than 0.45(1 m away from the fire)and 0.75(3 m away from the fire)whether the relative velocity is 5 m/s or 10 m/s.(4)The research results could provide references for fire protection technical standards and the design of smoke management systems.
subway tunnelmoving trainearly stage of firesmoke flow characteristics
万方数据
维普
