FULL SCALE EXPERIMENTAL INVESTIGATION OF PERFORMANCE OF FIBER OPTIC FIRE DETECTION IN THE ROAD TUNNEL
Fire detection systems are essential element of fire protection systems of road tunnels. Fire detectors should provide early warning of a fire incident at its initial stage, identify its location and monitor fire development in tunnels. In this paper, the performance of using fiber optic detectors in road tunnels was investigated through full scale experiments. Two types of detection system named distribution fiber optic heat detection system (DTS) and fiber Bragg grating heat detection system (FBG) were used. Tests were conducted using a 0.7 MW gasoline pool fires with and without obstruction and forced longitudinal ventilation. Results showed that the performance of fiber optic detectors varied greatly depending on the system configuration, the coverage degree between the fire source and the obstruction and the tunnel ventilation. The fire detection time of the DTS was much shorter than that of the FBG under the same tunnel fire condition. When the fire was covered with an obstruction, the detection time increased for the FBG while there had little effect on the DTS. Tunnel ventilation not only promoted smoke spreading more quickly downward the fire source, but also decreased the smoke temperature, therefore had negative effect on the performance of both fiber optic detectors. For the DTS, the fire detection time increased about 70％ and the identified location was 5.0m apart from fire source with the wind velocity of 1.1m/s in the tunnel. However, there was no correct fire detection for the FBG under the same conditions.
distribution fiber optic heat detection system fiber Bragg grating heat detection system road tunnel full scale test
BeiHua Cong Bin Che Miao Tang Xin Han
Shanghai Institute of Disaster Prevention and Relief, Tongji University, Shanghai 200092, P.R. China Shanghai Institute of Disaster Prevention and Relief, Tongji University, Shanghai 200092, P.R. China
国际会议
广州
英文
1614-1618
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）