Study on the heat exhaust coefficient and smoke flow characteristics under lateral smoke exhaust in tunnel fires

2019 ◽  
Vol 43 (7) ◽  
pp. 857-867 ◽  
Author(s):  
Zhisheng Xu ◽  
Qiulin Liu ◽  
Lu He ◽  
Haowen Tao ◽  
Jiaming Zhao ◽  
...  
Keyword(s):  
Flow Characteristics ◽  
Tunnel Fires ◽  
Smoke Flow

The maximum temperature of buoyancy-driven smoke flow beneath the ceiling in tunnel fires

2011 ◽  
Vol 46 (4) ◽  
pp. 204-210 ◽  
Author(s):  
Ying Zhen Li ◽  
Bo Lei ◽  
Haukur Ingason
Keyword(s):  
Maximum Temperature ◽  
Tunnel Fires ◽  
Smoke Flow

Fire Smoke Simulation Analysis of the Flow Characteristics in Huge Building

2011 ◽  
Vol 368-373 ◽  
pp. 1182-1185
Author(s):  
Chan Juan Xu ◽  
Shu Ping Zhang ◽  
Jing Jing Zhang
Keyword(s):  
Simulation Analysis ◽  
Fire Hazard ◽  
Hazard Analysis ◽  
Flow Characteristics ◽  
Simulation Software ◽  
Smoke Flow ◽  
Fire Scenario ◽  
Fire Smoke ◽  
Convention Center ◽  
Sharing Space

To a large comprehensive convention center as an example, this paper analyses the flow characteristics of fire smoke of the main hall and the feasibility for sharing space as "Quasi safety zone". First, the fire scenario was identified through the fire hazard analysis, then, set a model and take a simulation analysis by fire simulation software FDS, based on this fire scenario which have been established. At last, draw conclusions according to the smoke flow properties.

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).

Control of smoke flow in tunnel fires

1995 ◽  
Vol 25 (4) ◽  
pp. 305-322 ◽  
Author(s):  
Yasushi Oka ◽  
Graham T. Atkinson
Keyword(s):  
Tunnel Fires ◽  
Smoke Flow

scholarly journals Smoke flow in full-scale urban road tunnel fires with large cross-sectional vertical shafts

2020 ◽  
Vol 104 ◽  
pp. 103536
Author(s):  
Qinghua Guo ◽  
Hehua Zhu ◽  
Yuxin Zhang ◽  
Yi Shen ◽  
Yinping Zhang ◽  
...  
Keyword(s):  
Full Scale ◽  
Road Tunnel ◽  
Cross Sectional ◽  
Urban Road ◽  
Tunnel Fires ◽  
Smoke Flow

Study on fire smoke flow characteristics in the ventilation network and linkage control system in coal mines

2020 ◽  
Vol 44 (7) ◽  
pp. 989-1003
Author(s):  
Kai Wang ◽  
Haiqing Hao ◽  
Shuguang Jiang ◽  
Zhengyan Wu ◽  
Weiyao Cai ◽  
...  
Keyword(s):  
Control System ◽  
Coal Mines ◽  
Flow Characteristics ◽  
Ventilation Network ◽  
Smoke Flow ◽  
Fire Smoke
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