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| Study on flue gas flow characteristics of sightseeing tunnels |
| ZHAO Xuming1, LEI Wenjun1*, CAI Mingqing2, TAI Chuanmin1, ZHANG Linhua1
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1. School of Thermal Energy Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China;
2. Jinan High-tech Holding Group Co., Ltd., Jinan 250101, Shandong, China |
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Abstract In this research,the smoke flow characteristics of a scenic sightseeing tunnel in different fire scenarios were investigated based on numerical calculation methods. It was found that the location of the fire source had a significant effect on the flame spreading speed, and the flame spread faster to the fire elevator end when the fire point was close to the entrance of the tunnel; at the early stage of spreading, the diffusion speed of the lower surface was larger than that of the upper surface. As the intensity of the fire source increased, the ignition time of the sightseeing screen was gradually shortened from 52 s to 29 s. When the intensity of the fire source increased from 0.5 MW to 1.0 MW, the ignition time was shortened by about 20 s, and the evacuation time was greatly advanced. The research also showed that when the intensity of the fire source was less than 1.0 MW, the time to reach the critical point for safe evacuation of the tunnel due to spontaneous ignition of the electrical wiring was even shorter than that due to ignition, at 92 s, which was about 20% earlier. However, the fire hazard caused by the ignition of electrical wiring was more serious when the source of ignition exceeded 1.0 MW. Although the positive-pressure air supply in the elevator vestibule suppressed the spread of smoke to some extent, the evacuation conditions at the fire elevator end were still poor, with CO concentrations of up to 920 mg/m3, which could not meet the evacuation requirements.
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Published: 28 March 2025
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