期刊
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
卷 201, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jweia.2020.104173
关键词
Tunnel fire; Natural ventilation; Vertical shaft; Heat exhaust efficiency
资金
- National Natural Science Foundation of China [51974361, 51608163]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts171]
- China Scholarship Council (CSC) under Program for Ph.D. Student Overseas Study Scholarship 2019 [201906370090]
The experimental study is conducted to investigate the heat exhaust efficiency with different shaft heights and heat release rates (HRRs) in a 1:10 tunnel model. The degree of plug-holing below the exhaust vent is considered. The smoke characteristics in upstream and shaft, such as flow velocity and smoke temperature rise, are discussed in this paper. The results indicate that the smoke movement in the upstream flow of the exhaust vent is mainly determined by the HRR of the fire and less affected by the vertical shaft height. The performance of the vertical shaft changes as the shaft height changes. Comparing constant HRR from the pool fire, the heat exhaust efficiency of vertical shafts does not increase all the time but decreases first and then increases. Furthermore, an empirical model is proposed based on the experimental results, which can be used to calculate the heat exhaust efficiency.
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