| Title |
An Experimental Study of Smoke Movement in Tunnel Fires with Natural Ventilation |
| Keywords |
Tunnel fire ; 터널화재 ; Smoke movement ; 연기거동 ; Ventilation ; 환기 ; Froude scaling ; Froude 상사 ; Visualization ; 가시화 |
| Abstract |
In this study, reduced-scale experiments were conducted to analyze smoke movement in tunnel fire with roof vent. The 1/20 scale experiments were carried out under the Froude scaling using gasoline pool fire ranging from 7.3 to 15.4 cm in diameter with total heat release rate from 1.0 to 8.46 kW. In case of 1 m high vent, smoke front reached to the tunnel exit at about 16 sec delayed with ventilation. The delay time grew longer with the vent height. The temperature after the vent was lower than that without the vent. The exit temperature declined maximum of 20℃ after passing the vent. It was confirmed that the thickness of smoke layer was maintained uniformly under the 25% height of the tunnel through the visualized smoke flow by a laser sheet and the digital camcorder. |