| Title |
An Experimental Study of Smoke Movement in Tunnel Fires with a Vertical Shaft |
| Keywords |
Tunnel fire ; 터널화재 ; Smoke movement ; 연기거동 ; Natural ventilation ; 자연환기 ; Vertical shaft ; 수직갱 |
| Abstract |
The present paper concerns a smoke movement in a tunnel fire with a vertical shaft. The model tunnel measured 13.4m long, 0.4m wide and 0.4m high. The cross section is 1：20 of a full scale tunnel. Ethanol was used as a fuel. The fire size in model tests varied from 1.35kW to 13.37kW, which corresponds to full scale fires of 2.41 to 23.91MW. Smoke front velocity and temperatrue were decreased due to the vertical shaft install. Temperature was reduced maximum about 20℃ at ceiling and about 23℃ at vertical position. CO concentration was reduced as the vent width widened. When vent width was more than 15 cm, CO concentration was not reached 100ppm. Descent degree of the smoke layer was confirmed through the visualization. |