Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal

Weng, Miao Cheng; Yu, Longxing; Liu, Fang; Nielsen, Peter

doi:10.1016/j.tust.2014.02.007

Cited by 76 publications

(20 citation statements)

References 33 publications

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“…In order to optimize the meshes efficiency in FDS simulations, the whole tunnel domain was divided into three continuous domains, the domain close to the inlet is defined as Right Domain, the domain close to the outlet is defined as Left Domain, and the domain with fire source is defined as Middle Domain, the lengths for the three domains are 30 m, 30 m and 90 m. Because the parameters variation of smoke fire near the fire source is strong, the meshes in the Middle Domain are refined, the meshes in the other two domains are generalized (Weng et al, 2014).…”

Section: Meshesmentioning

confidence: 99%

Prediction of backlayering length and critical velocity in metro tunnel fires

Weng

Liu

et al. 2015

Tunnelling and Underground Space Technology

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118

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Section: Meshesmentioning

confidence: 99%

Prediction of backlayering length and critical velocity in metro tunnel fires

Weng

Liu

et al. 2015

Tunnelling and Underground Space Technology

Self Cite

118

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“…As shown in Figure , a full‐scale metro tunnel is constructed by FDS with a length of 600 m, 5.0 m in height, and 4.2 m in width, referred to the previous studies . The properties of “concrete” are listed in Table , which is the lining material of metro tunnel surfaces, including wall, floor, and ceiling.…”

Section: Numerical Methodologymentioning

confidence: 99%

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Zhang

Shi

et al. 2020

Fire and Materials

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To address the effect of metro train blockage on the critical ventilation velocity in a long tunnel, a series of scenarios were conducted numerically through this study, including different fire sizes (5-10 MW), metro train lengths (80-120 m), and blockage ratios (φ, 0.50, and 0.57). It is known from the numerical results that the metro train length shows a limited effect on the critical ventilation velocity, which is because the longitudinal ventilation has become stable before reaching the fire source to prevent smoke back-layering, and increasing the metro train length only increases the distance of stabilizing the longitudinal ventilation. The blockage ratio shows an obvious influence on the critical ventilation velocity, which is because the presence of the metro train can obviously reduce the flow cross-sectional area of the tunnel. An empirical model is developed as well, while it is known that the critical ventilation velocity increases with the one-third power of dimensionless heat release rate and (1-φ). The research outcomes of this study provide a technical guide for the design of the metro tunnel and the relevant emergency management of fire rescue under fire conditions. K E Y W O R D S blockage ratio, critical velocity, FDS, metro train, subway tunnel 1 | INTRODUCTION An increasing number of metro systems have been designed and constructed recently to release the urgent issues of accelerated urbanization and growing population in metropolises. The companied fire risk is always an important and hot research topic from both the academia and industries. Consequence and impact of the relevant fire accidents are very high, which can be proved by the large number of fire casualties and very bad influence in the past few decades, such as the Daegu metro fire in South Korea, the Viamala tunnel fire in Switzerland, and the Burnley tunnel fire in Austria. [1][2][3][4] To benefit with the fire safety of those metro systems, smoke movement is an inevitable aspect during the design as it is the most fatal factor of a tunnel fire. 5-7 Therefore, how to control the smoke movement effectively to provide a safe zone for the occupants and firefighters during the evacuation and rescuing processes, respectively, becomes an important question that needs to be answered urgently.It is indicated that the metro train fails to reach the next station and stops between the two stations in about 50% of fires. 8,9 When a fire occurs in the metro tunnel, the relevant ventilation facilities in the adjacent stations will be started, where longitudinal ventilation is triggered, which not only can prevent the smoke from spreading to the upstream and also offer a safe zone without smoke for both occupants and firefighters. If the designed longitudinal ventilation velocity is smaller than the critical value, the smoke released from the fire can break through the barrier raised by the longitudinal ventilation and then threaten the people upstream.Many studies have been undertaken in identifying the appropriate longitudinal ventilation v...

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“…Although there are many problems in using computational fluid dynamics CFD, it can be applied to predict macroscopic flow parameters (Qu and Chow, 2012). By using CFD, research has been conducted on the density jump (Qu and Chow, 2012), smoke control (Weng et al, 2014), critical ventilation velocity (Hwang and Edwards, 2015), stack effects on natural ventilation (Ji et al, 2013), and slope influence (Ballesteros-Tajadura et al, 2006) in a tunnel fire.…”

Section: Introductionmentioning

confidence: 99%

Studies on Smoke Temperature Distribution in a Building Corridor Based on Reduced-scale Experiments

Zhou

Mao

Huang

et al. 2017

Journal of Asian Architecture and Building Engineering

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A reduced-scale (1:4) building corridor model was prepared to investigate the heat release rate (HRR) and smoke diffusion in a building corridor. Trays with heptane as fuel were used as fire sources. Three different sizes of trays were involved in this study to investigate the different HRRs. The results revealed that fire associated with larger trays exhibited a steeper power-law growth and decay. The temperature distributions in the corridor for the three cases showed similar tendencies. The temperature in the upper part of the corridor was relatively high, which decayed sharply along the corridor. However, the temperature in the lower part of the corridor was approximately the ambient temperature. Numerical simulation was also introduced to obtain more details regarding the temperature. The ceiling temperature was studied by using dimensionless parameters. The correlation between the ceiling temperature and the distance was fitted by using an exponential equation, and significant fitting results were obtained. Moreover, the vertical average temperatures in the corridor were also studied. The result indicated that greater HRRs led to higher vertical average temperatures with steeper growths and decreases.

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Full-scale experiment and CFD simulation on smoke movement and smoke control in a metro tunnel with one opening portal

Cited by 76 publications

References 33 publications

Prediction of backlayering length and critical velocity in metro tunnel fires

Prediction of backlayering length and critical velocity in metro tunnel fires

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Studies on Smoke Temperature Distribution in a Building Corridor Based on Reduced-scale Experiments

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