Research on the Influence of slope and heat release rate on the critical velocity of straddle monorail tunnel

Jiehang Deng; Yanqiu Chen; Peng Wang

doi:10.1117/12.2611345

14 October 2021 Research on the Influence of slope and heat release rate on the critical velocity of straddle monorail tunnel

Jiehang Deng, Yanqiu Chen, Peng Wang

Author Affiliations +

Proceedings Volume 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation; 1193018 (2021) https://doi.org/10.1117/12.2611345
Event: International Conference on Mechanical Engineering, Measurement Control, and Instrumentation (MEMCI 2021), 2021, Guangzhou, China

Abstract

Straddle monorail tunnel are mainly used in urban rail transit with the characteristics of larger structural section, larger slope, and higher heat release rate than subway tunnel. In order to study the influence of slope and heat release rate on smoke movement of critical velocity of longitudinal ventilation tunnel, different slope (-6%, -3%, 0%, 3%, 6%) and different heat release rate (5 MW, 10 MW, 20MW, 50MW) are studied in this paper based on the 1/20 straddle monorail tunnel model. The result shows that the slope of the tunnel and the heat release rate of fire are the main influencing factors. Firstly, compared with 0% critical velocity, the critical velocity of uphill air supply is greater and that of downhill air supply is smaller. Secondly the critical velocity of downhill air supply changes very little when the heat release rate and slope are large enough. Besides, critical velocity of the uphill air supply has a linear relationship with the slope, while that of the downhill air supply has an inverse proportional relationship with the slope. Finally, the critical velocity factor based on experimental data is proposed at the end of the paper.

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Jiehang Deng, Yanqiu Chen, and Peng Wang "Research on the Influence of slope and heat release rate on the critical velocity of straddle monorail tunnel", Proc. SPIE 11930, International Conference on Mechanical Engineering, Measurement Control, and Instrumentation, 1193018 (14 October 2021); https://doi.org/10.1117/12.2611345

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