Experimental Investigation on the Influence of Longitudinal Ventilation on Tunnel Fire Characteristics and Natural Smoke Exhaust by Shaft
[1]ZHONG Wei,LIU Xin,GAO Zihe.Experimental Investigation on the Influence of Longitudinal Ventilation on Tunnel Fire Characteristics and Natural Smoke Exhaust by Shaft[J].Journal of Zhengzhou University (Engineering Science),2020,41(06):46-52.[doi:10.13705/j.issn.1671-6833.2020.06.004]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41卷
Number of periods:
2020 06
Page number:
46-52
Column:
Public date:
2020-12-31
- Title:
- Experimental Investigation on the Influence of Longitudinal Ventilation on Tunnel Fire Characteristics and Natural Smoke Exhaust by Shaft
- Keywords:
- tunnel; longitudinal ventilation; shaft; plug-holing; froude number
- CLC:
- -
- DOI:
- 10.13705/j.issn.1671-6833.2020.06.004
- Abstract:
- In this paper, a 1∶10 scale tunnel was adopted to investigate the influence of longitudinal ventilation on the fire behavior in tunnel and the natural smoke exhaust by vertical shaft. Results showed that the flame inclination and the mass loss rate of fire changed with the ventilation velocity and shaft height, which further influenced the temperature distribution and smoke exhaust velocity through the shaft. Once plug-holing occurred, the fresh air in the lower of tunnel would be exhausted through the shaft directly, greatly reducing the smoke exhaust effect. On this basis, the critical Froude number proposed by Hinckley was improved, and the critical Froude number for natural exhaust by shaft under the longitudinal ventilation was determined as 3.2. For Froude number in the range of 3.2 to 5.1, plug-holing occurred, while for Froude number in the range of 0.6 to 3.2, there was no plug-holing.
- References:
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Last Update:
2021-02-10