Research on the Central Smoke Extraction System of Extra-long Highway Tunnel

Tunnel longitudinal ventilation system for smoke control was the main form in extra-long road tunnels.A new central smoke extraction system for tunnel fire was introduced with consideration of smoke control.Using three-dimensional numerical simulation technology,smoke control effect and movement characteristics of the two smoke control methods were analyzed.With different smoke open size and spacing,the smoke control effect was studied for tunnel fire in central smoke extraction system.The central smoke extraction system has better effect than longitudinal ventilation system for smoke control.The smoke movement characteristics and control effect were influenced by smoke open size and spacing.