A111 FDSによるトンネル火災時の熱気流挙動の数値シミュレーション(燃焼科学と技術の新展開I)

抄録

To reduce victims, a ventilation system has important role at tunnel fire. In this study, thermal flow behavior is numerically predicted in several ventilation wind velocity at one-way tunnel fire. Fire Dynamics Simulator (FDS) is employed for this study. Heat release source is put as a box on the center in tunnel. Heat release rate and box size are given at several conditions as a car, bus and so on. The numerical results show hot gas flows downward when a ventilation wind is fast. Hot gas, however, goes upward along a ceiling, when a ventilation velocity is slowed down. The critical ventilation wind velocity with each condition is estimated.