Abstract
Emergency ventilation systems are commonly used for smoke control during tunnel fires. Numerical results show that the fire and smoke would be confined effectively by the water mist screen and transverse ventilation system (WMSTV system) system, and the environment inside the confined zone would be suitable for occupants’ evacuation and fire fighting. In this paper, the smoke control parameters of WMSTV system are proposed. The visibility distributions and smoke extraction efficiency are analyzed by FDS simulation. The results show that the minimum spacing distance between smoke vents should not be less than 40 m, while the maximum spacing distance should not exceed 60 m for 30 MW of fire. The spacing distance between the screen and vent is suggested to fall in 30–45 m. Two vents are recommended in the control zone with the screen spacing of 120 and 150 m. Four vents are recommended in the control zone with the screen spacing of 180 m.
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