Influence of smoke vent orientation and draft curtain on smoke exhaust effect of subway platform
In order to improve the smoke exhaust effect of subway platform,the smoke exhaust effect of the mechanical ex-haust system in subway station with different smoke vent orientations was analyzed through numerical simulation,and the in-fluence of the height of draft curtain on the smoke exhaust effect was further studied.The results show that the orientation of smoke vent is not the main factor affecting the smoke control effect,the exhaust effect of top surface smoke exhaust is the best,its total exhaust heat is 1.32 times that of the bottom smoke exhaust,and the total smoke exhaust volume is 1.19 times that of the bottom smoke exhaust.The reasons for the difference in smoke exhaust effect are explained by analyzing the inhala-tion methods and temperature of the three smoke exhaust systems.Adding the draft curtain can play a good smoke control effect,and when the lower height of the draft curtain is reduced to 3.5 m,3.0 m and 2.5 m respectively,the smoke can be controlled in the fire smoke control zone by top surface exhaust,lateral exhaust and bottom exhaust.The draft curtain has a synergistic effect with the mechanical smoke exhaust system,and the smoke exhaust effect can be effectively improved by set-ting draft curtain.Therefore,it is recommended to adopt the smoke exhaust mode with top surface vent of the smoke exhaust pipe,and the smoke exhaust effect of the existing smoke exhaust system can be improved by setting a certain height of the draft curtain.The research results can provide reference for the design of smoke exhaust system of subway platform.
NETL
NSTL
万方数据
维普
