Full-scale experiment of longitudinal ventilation smoke control system and central smoke exhaust system in city underwater tunnel

Taking a city underwater tunnel as an example, temperature variation and smoke movement under longitudinal ventilation smoke control system and central smoke exhaust system were measured by full-scale experiment. Different longitudinal airflow speeds under central exhaust system were discussed. Based on the results, a fire caused by an accidental vehicular(3MW), longitudinal ventilation smoke control system accelerate the smoke spread to the downstream and the smoke sedimentation, increase smoke spread distance and decrease the temperature in tunnel. For central smoke exhaust system, smoke is being exhaust through the duct, reduces the speed of fire smoke movement and smoke sedimentation. But the temperature of central smoke exhaust system is higher than using longitudinal ventilation system at the downstream of tunnel.