Experimental study on smoke control mode of longitudinal ventilation in existing subway station
By the experiment on the existing railway station in Bei-jing,the smoke spread law and downdraft velocity under different smoke control conditions are analyzed.At the same time,the nu-merical simulation model corresponding to the actual size is estab-lished by FDS,and the working condition of smoke control mode change is added.Based on the available safe egress time judgment of the visibility,the smoke exhaust capacity in platform is stud-ied.The results show that:for different smoke control modes,the smoke spreading law is not consistent.For the existing station,opening all fans and only opening No.1 fan will cause negative pressure at the staircase,that is,the smoke from the fire on the platform will not spread to the station hall;the analysis of the downdraft airflow velocity of the staircase section shows that the opening of all fans meets the requirements of the standard down-draft airflow velocity of the staircase of 1.5 m/s,while only open-ing No.1 fan,one side of the platform cannot meet the require-ments of the standard;on the basis of the analysis of the smoke spreading law and the section wind speed,it is known that No.1 fan plays a main role in the station safety;combined with the test data of the staircase section wind speed and the simulated data of the available safe egress time judgment of the visibility,it is known that opening all fans greatly improves the safety of the sta-tion hall compared with only opening No.1 fan,but has little ef-fect on the smoke exhaust capacity of the station.
existing subway station firesmoke control modenu-merical simulationsmoke spreaddowndraft airflow
万方数据
维普
