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Critical ventilation velocity for tunnel fires occurring near tunnel exits |
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| Authors: | Kuang-Chung Tsai Yee-Ping LeeShin-Ku Lee |
| Affiliation: | a Department of Safety, Health and Environmental Engineering, National Kaohsiung First University of Science and Technology, 2 Juoyue Road, Nantzu, Kaohsiung 811, Taiwan b Department of Civil and Environmental Engineering, Nanya Institute of Technology, No. 414, Sec. 3, Jhongshan E. Rd., Jhongli City, Taoyuan County 32091, Taiwan c Department of Mechanical Engineering, National Cheng-Kung University, No. 1 University Road, Tainan 701, Taiwan |
| Abstract: | Ventilation is an effective method for controlling smoke during a tunnel fire. The “critical ventilation velocity” ucr is generally defined as the minimum velocity at which smoke is prevented from spreading against the longitudinal ventilation flow in tunnel fire situations. This study conducted small-scale experiments to investigate ucr for situations when tunnel fire occurs near tunnel exits. The model tunnel was 4 m long, 0.6 m wide and 0.6 m tall, and the fires were located at 0.5 m, 1.0 m and 1.5 m from the tunnel exit. 6.3×6.3 cm2 and 9.0×9.0 cm2 square asoline fuel pans were used as fire source. Results show that ucr decreases as the fire approaches the tunnel exit. |
| Keywords: | Tunnel fire Critical ventilation velocity Ceiling jets |
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