Research On Smoke Flow And Smoke Control System Of Subway Island Platform

As the main line of the urban traffic system,the subway has the characteristics of narrow space and high personnel density.Once a fire accident occurs,the hightemperature smoke will spread rapidly and the consequences cannot be underestimated.Studying and mastering the flow of high-temperature smoke during the fire and the smoke exhausting effect of the smoke control system have important practical significance for the safe evacuation of personnel.This paper took a double-deck island subway station in Tianjin as the research object,established the physical model of the public area of the platform,and determined the relevant solution parameters and calculation methods.The on-site cold smoke experiment was carried out to test the air filling speed at the stairway of the platform,and the wind speed simulation value was compared with the test value to verify the accuracy of the model.The verified model was used to simulate the smoke exhausting effect of the existing smoke control system,and the differences in smoke exhausting effects under different fire source locations were compared and analyzed to determine the problems in the original design.Adjusted the operating mode of the system and compared the causes of the problem.Based on the problems existing in the original design,optimization was performed from both the overall control and the partition control.The influences of the position of the auxiliary exhaust vent and the amount of auxiliary smoke exhaust on the smoke exhausting effect were studied.The results showed that when a fire occurred in the middle area of the platform,the closer the auxiliary exhaust vent was to the fire source,the better the smoke exhausting effect;Within a certain range,the increase of the amount of auxiliary smoke exhaust could improve the smoke exhausting effect,but it should not be too large,otherwise it will affect the smoke exhausting effect.