Smoke Exhaust Efficiency of Different Smoke Exhaust Outlets Opened in Subway Station Halls
In response to the problem of a relatively single smoke exhaust mode and low smoke exhaust efficiency in the public area of a subway station,this study considered the public area of a certain urban rail transit station concourse as an example to establish eight different smoke exhaust conditions,focusing on the smoke exhaust efficiency of opening smoke exhaust outlets at different positions.Through simulations,the relationships between visibility,temperature,and carbon monoxide(CO)concentration over time under different working conditions were obtained.The research results show that when a fire occurs in the public area of a subway station concourse,it is not better to open more smoke exhaust outlets but to determine according to the opening position of the smoke exhaust outlets.Opening the smoke exhaust outlet during the horizontal spread stage of smoke will interfere with the horizontal layered flow of smoke and intensify the heat and material exchange between the upper layer of smoke and the lower layer of cold air,resulting in a decrease in the height layer with a temperature of 60℃ and a visibility of 10 m,which is not conducive to personnel evacuation;When the fire source is located at the most unfavorable point of the smoke exhaust system in the middle of the public area on the concourse level,the smoke exhaust outlet near the smoke barrier wall in the middle of the public area on the concourse level should be opened normally to smoothly discharge the accumulated fire smoke.
urban rail transitstation hall firesimulationventilation modesmoke exhaust effectfire dynamics simulator
NETL
NSTL
万方数据
