Smoke back-layering flow length in longitudinal ventilated tunnel fires with vertical shaft in the upstream

Yao, Y, Cheng, X, Zhang, S, Zhu, K, Shi, L and Zhang, H 2016, 'Smoke back-layering flow length in longitudinal ventilated tunnel fires with vertical shaft in the upstream', Applied Thermal Engineering, vol. 107, pp. 738-746.


Document type: Journal Article
Collection: Journal Articles

Title Smoke back-layering flow length in longitudinal ventilated tunnel fires with vertical shaft in the upstream
Author(s) Yao, Y
Cheng, X
Zhang, S
Zhu, K
Shi, L
Zhang, H
Year 2016
Journal name Applied Thermal Engineering
Volume number 107
Start page 738
End page 746
Total pages 9
Publisher Elsevier
Abstract Smoke back-layering flow length is the length of the reversed smoke flow upstream of the fire when the longitudinal ventilation velocity is lower than the critical velocity. This paper experimentally investigates the smoke back-layering flow length of longitudinal ventilated tunnel fires with a vertical shaft in the upstream (0.5-4.0 m from the fire source) using a 1/10 reduced-scale subway tunnel model. Experimental results show that the vertical shaft in the upstream can control the smoke back-layering flow length within a relatively limited range, compared to the tunnel without vertical shaft. Moreover, for the cases that the fire source is not located exactly below the vertical shaft, the most appropriate dimensionless distance between the vertical shaft and fire source is 3, resulting in the shortest smoke back-layering flow length. By introducing a concept of virtual fire source below vertical shaft, a new empirical model was further deduced to predict the smoke back-layering flow length. Its predictions fit reasonably well when the dimensionless longitudinal flow velocity is less than 0.19. Beyond that, the predictions are little higher than the experiments, which is because some of the assumptions in this model are invalid under higher longitudinal ventilation velocity.
Subject Construction Engineering
Keyword(s) Longitudinal ventilation
Smoke back-layering flow length
Tunnel fire
Vertical shaft
Virtual fire source
DOI - identifier 10.1016/j.applthermaleng.2016.07.027
Copyright notice © 2016 Elsevier Ltd
ISSN 1359-4311
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