Effects of the ventilation duct arrangement and duct geometry on ventilation performance in a subway tunnel

Huang, Yuandong; Gong, Xiao-lu; Peng, Yue-jiao; Lin, Xiaoyu; Kim, Chang-Nyung

doi:10.1016/j.tust.2011.05.005

Cited by 58 publications

(15 citation statements)

References 6 publications

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“…The scale model configuration used in this study is duplicated from the experimental set-up presented by Kim and Kim [8] and used subsequently by various authors [9,27,28]. The model is shown schematically in Figure 1, and describes a 1 /20 scale model of an underground railway.…”

Section: Model Set-upmentioning

confidence: 99%

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Cross

Hughes

Ingham

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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In order to ensure the safety and comfort of passengers and staff, an underground railway requires an extensive ventilation and cooling system. One mechanism for underground railway ventilation is the movement of air induced by trains, termed the 'piston effect'. This study investigated the effect of altering the blockage ratio of an underground train upon the ventilating air flows driven by a train. First a computational model was developed and validated with experimental data from literature. This model was scaled to represent an operational underground railway with high blockage ratio and the blockage ratio varied to evaluate the effects upon ventilation. The results of this study show that ventilating air flows can be increased significantly during periods of constant train motion and acceleration, by factors of 1.4 and 2 respectively, but that the train drag will increase at the same rate. During deceleration negligible increases in ventilation flows are found but drag increases by a factor of 4.

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Section: Model Set-upmentioning

confidence: 99%

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Cross

Hughes

Ingham

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

View full text Add to dashboard Cite

show abstract

“…According to the Specifications for Design of Ventilation and Lighting of Highway Tunnel, the concentration of carbon monoxide is simplified as the formula of (4-3), 6 1 3.6 10…”

Section: Determine the Heatmentioning

confidence: 99%

Influence of opening area ratio on natural ventilation in city tunnel under block transportation

Zhu

Tong

Chen

et al. 2015

Sustainable Cities and Society

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“…In the case of fire, the transportation of smoke along the tunnel is altered by its slope, length, traffic, etc., and the obstruction of the ventilation ports increase a different variable in the analysis of physical scenario apart from external weather conditions [17][18][19][20][21][22][23][24][25]. The complexity of the situation creates the need not only for the creation of general but for particular emergency response procedures [26].…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Obstructed Ventilation Ports in a Subway Tunnel Section

Herrera¹,

Pineda²,

Silva-Rivera

et al. 2017

Int. j. simul. model.

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A CFD simulation of the air velocity in a subway tunnel section of 1400 m in length is presented. In this case of study; the simulation compares the air velocity changes when two of six natural ventilation ports are totally obstructed. They are required for hot air exhaust, smoke release and fresh air intake. The mechanical ventilation system is located inside the tunnel at 650 m from the end of a passenger platform and 750 m from the other, it is a non-symmetrical scenario. The simulation was carried in ANSYS® Fluent compared with NFPA calculation and considering geometries and dimensions of an actual subway section of the Mexico City. Four different numerical models were created to analyse eight different cases. The results indicate that the obstruction of the ports create a non-homogeneous distribution of the flow velocity inside the passenger platform with an approximate difference of 1.5 m/s. This value is very important in cases when the backlayering effect has to be avoided as in the case of smoke transportation, exhaust of smoke and the transport of dust or some other contaminant. The emergency procedures and the design of escape routes can be improved by considering the physical changes occurring when the ventilation ports are obstructed. Since the atmospheric pressure influence the direction and velocity of the flow coming from the non-obstructed vents.

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Effects of the ventilation duct arrangement and duct geometry on ventilation performance in a subway tunnel

Cited by 58 publications

References 6 publications

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Influence of opening area ratio on natural ventilation in city tunnel under block transportation

CFD Simulation of Obstructed Ventilation Ports in a Subway Tunnel Section

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