The characteristics of smoke layer and fire toxicity of tunnel fires with the effect of lateral smoke extraction

2021 ◽  
Author(s):  
Yuantao Zhu ◽  
Fei Tang ◽  
Yuhang Chen ◽  
Tong Xu
Keyword(s):  
Tunnel Fires ◽  
Smoke Layer

scholarly journals Experimental Investigation on the Discharge of Pollutants from Tunnel Fires

2020 ◽  
Vol 12 (5) ◽  
pp. 1817
Author(s):  
Lihua Zhai ◽  
Zhongxing Nong ◽  
Guanhong He ◽  
Baochao Xie ◽  
Zhisheng Xu ◽  
...  
Keyword(s):  
Laser Sheet ◽  
Longitudinal Velocity ◽  
Release Rates ◽  
Layer Height ◽  
Tunnel Fires ◽  
Smoke Flow ◽  
Longitudinal Ventilation ◽  
Toxic Gases ◽  
Smoke Layer ◽  
Series Of Experiments

Many pollutants are generated during tunnel fires, such as smoke and toxic gases. How to control the smoke generated by tunnel fires was focused on in this paper. A series of experiments were carried out in a 1:10 model tunnel with dimensions of 6.0 m × 1.0 m × 0.7 m. The purpose was to investigate the smoke layer thickness and the heat exhaust coefficient of the tunnel mechanical smoke exhaust mode under longitudinal wind. Ethanol was employed as fuel, and the heat release rates were set to be 10.6 kW, 18.6 kW, and 31.9 kW. The exhaust velocity was 0.32–3.16 m/s, and the longitudinal velocity was 0–0.47 m/s. The temperature profile in the tunnel was measured, and the buoyant flow stratification regime was visualized by a laser sheet. The results showed that the longitudinal ventilation leads to a secondary stratification of the smoke flow. In the ceiling extract tunnel under longitudinal ventilation, considering the research results of the smoke layer height and the heat exhaust coefficient, a better scheme for fire-producing pollutants was that an exhaust velocity of 1.26–2.21 m/s (corresponding to the actual velocity of 4.0–7.0 m/s) should be used. The longitudinal velocity should be 0.16–0.32 m/s (corresponding to the actual velocity of 0.5–1.0 m/s).

DECAY OF BUOYANT SMOKE LAYER TEMPERATURE ALONG THE LONGITUDINAL DIRECTION IN TUNNEL FIRES

2004 ◽  
Vol 13 (1) ◽  
pp. 53-77 ◽  
Author(s):  
L. H. HU ◽  
R. HUO ◽  
W. K. CHOW ◽  
H. B. WANG ◽  
R. X. YANG
Keyword(s):  
Longitudinal Direction ◽  
Tunnel Fires ◽  
Smoke Layer

Study on the effect of tunnel dimensions on the smoke layer thickness in naturally ventilated short tunnel fires

2021 ◽  
Vol 112 ◽  
pp. 103941
Author(s):  
Lu He ◽  
Zhisheng Xu ◽  
Frank Markert ◽  
Jiaming Zhao ◽  
En Xie ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Tunnel Fires ◽  
Smoke Layer ◽  
Short Tunnel

MEASUREMENT OF SMOKE LAYER INTERFACE HEIGHT FOR HOT SMOKE TESTS IN TUNNELS

Equipment ◽  
2006 ◽  
Author(s):  
L. H. Hu ◽  
W. K. Chow ◽  
Y. Z. Li ◽  
R. Huo
Keyword(s):  
Layer Interface ◽  
Smoke Layer

scholarly journals Emergency preparedness for tunnel fires – A systems-oriented approach

2021 ◽  
Vol 143 ◽  
pp. 105408
Author(s):  
Henrik Bjelland ◽  
Ove Njå ◽  
Atle William Heskestad ◽  
Geir Sverre Braut
Keyword(s):  
Emergency Preparedness ◽  
Tunnel Fires ◽  
Oriented Approach

Experimental study of different sealing ratios on the self-extinction of tunnel fires

2021 ◽  
Vol 112 ◽  
pp. 103894
Author(s):  
Jia-Kang Shi ◽  
Cong Zuo ◽  
Yuan-yuan Xiong ◽  
Maolei Zhou ◽  
Peng Lin
Keyword(s):  
Experimental Study ◽  
The Self ◽  
Tunnel Fires
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