Smoke Movement in a Sloping Subway Tunnel Under Longitudinal Ventilation with Blockage

2017 ◽  
Vol 53 (6) ◽  
pp. 1985-2006 ◽  
Author(s):  
Kai Zhu ◽  
Long Shi ◽  
Yongzheng Yao ◽  
Shaogang Zhang ◽  
Hui Yang ◽  
...  
Keyword(s):  
Subway Tunnel ◽  
Smoke Movement ◽  
Longitudinal Ventilation

Experimental study on temperature profile and smoke movement in a model-branched tunnel fire under longitudinal ventilation

2022 ◽  
Vol 121 ◽  
pp. 104324
Author(s):  
Dongyue Zhao ◽  
Changkun Chen ◽  
Peng Lei ◽  
Tong Xu ◽  
Weibing Jiao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Temperature Profile ◽  
Smoke Movement ◽  
Tunnel Fire ◽  
Longitudinal Ventilation

The Influence of Train on the Smoke Movement in Subway Tunnel with Longitudinal Ventilations

2016 ◽  
pp. 915-924
Author(s):  
Shaogang Zhang ◽  
Xudong Cheng ◽  
Ruifang Zhang ◽  
Kaiyuan Li ◽  
Song Lu ◽  
...  
Keyword(s):  
Subway Tunnel ◽  
Smoke Movement

scholarly journals Numerical Study of Smoke Propagation in a Simulated Fire in a Wagon Within a Subway Tunnel

2008 ◽  
Author(s):  
Felipe Vittori ◽  
Luis Rojas-Solo´rzano ◽  
Armando J. Blanco ◽  
Rafael Urbina
Keyword(s):  
Numerical Study ◽  
Ventilation System ◽  
Road Tunnel ◽  
Subway Tunnel ◽  
Longitudinal Ventilation ◽  
Emergency Ventilation ◽  
Tunnel Section ◽  
Fire Scenarios ◽  
Subway Stations ◽  
Set Up

This work deals with the numerical (CFD) analysis of the smoke propagation during fires within closed environments. It is evaluated the capacity of the emergency ventilation system in controlling the smoke propagation and minimizing the deadly impact of an eventual fire in a wagon within the Metro de Caracas subway tunnel on the passengers safety. For the study, it was chosen the tunnel section between Teatros and Nuevo Circo subway stations, which consists of two parallel independent twin tunnels, connected through a transverse passage. The tunnels are provided by a longitudinal ventilation system, integrated by a set of reversible fans located at both ends of the tunnels. Three stages were considered in the study: (a) Model set up; (b) Mesh sensitivity analysis; (c) Validation of the physical-numerical parameters to be used in the numerical model; and (d) Simulation of fire scenarios in Metro de Caracas subway stations. Stages (b)–(c), aimed to testing and calibrating the CFD tool (ANSYS-CFX10™), focused on reproducing experimental data from Vauquelin and Me´gret [1], who studied the smoke propagation in a fire within a 1:20 scale road tunnel. Stage (d) critical scenarios were established via a preliminary discussion with safety experts from Metro de Caracas, in order to reduce the computer memory and the number of simulations to be performed. The analyses assessed the reliability of escape routes and alternative paths for the evacuation of passengers. Additionally, the smoke front movement was particularly computed, as a function of time, in order to determine the possible presence of the “backlayering” phenomenon [5]. Results demonstrate the strengths and weaknesses of the current ventilation system in the event of a fire in the subway tunnel, and suggest new strategies to address this potentially lethal event to minimize the risks for passengers.

Experimental study on curved flame characteristics under longitudinal ventilation in a subway tunnel

2017 ◽  
Vol 114 ◽  
pp. 733-743 ◽  
Author(s):  
Shaogang Zhang ◽  
Xudong Cheng ◽  
Kai Zhu ◽  
Yongzheng Yao ◽  
Long Shi ◽  
...  
Keyword(s):  
Experimental Study ◽  
Subway Tunnel ◽  
Longitudinal Ventilation

Effect Analysis of Different Exhaust Velocity on Fire Smoke Control in Subway Tunnel

2012 ◽  
Vol 424-425 ◽  
pp. 1224-1227
Author(s):  
Xin Han ◽  
Xiao Ming Gao ◽  
Bei Hua Cong
Keyword(s):  
Cfd Simulation ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Subway Tunnel ◽  
Control Effect ◽  
Smoke Control ◽  
Effect Analysis ◽  
Longitudinal Ventilation ◽  
Fire Smoke ◽  
Ventilation Velocity

Taking a subway tunnel as the research object and based on the CFD simulation method, this paper adopts a large eddy simulation analysis software FDS to simulate and analyze the effect of exhaust velocity on fire smoke control under the condition of the same longitudinal ventilation velocity in subway tunnel. The simulated results can provide some reference to design institutes in the selection of exhaust fan. While the longitudinal ventilation velocity set as 1m/s, the simulation results demonstrate that a quite good smoke control effect could be achieved when the exhaust velocity reaches 5 m/s in the smoke exhaust duct

Smoke movement in tilted tunnel fires with longitudinal ventilation

2015 ◽  
Vol 75 ◽  
pp. 14-22 ◽  
Author(s):  
W.K. Chow ◽  
Y. Gao ◽  
J.H. Zhao ◽  
J.F. Dang ◽  
C.L. Chow ◽  
...  
Keyword(s):  
Smoke Movement ◽  
Tunnel Fires ◽  
Longitudinal Ventilation

Study on smoke movement with semi-transverse smoke extraction in subway tunnel fire

2013 ◽  
pp. 195-199 ◽  
Author(s):  
Yanyan Lu ◽  
Fang Liu ◽  
Gang Li ◽  
Shujiang Liao
Keyword(s):  
Subway Tunnel ◽  
Smoke Movement ◽  
Tunnel Fire
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