Numerical Investigation on the length of the near-field region of smoke flow in tunnel fires

Wang, Zhengyang; Jiang, Xuepeng; Park, Haejun; Wang, Lujia; Wei, Jie

doi:10.1016/j.csite.2021.101584

Cited by 18 publications

(2 citation statements)

References 39 publications

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“…The numerical simulations for this work were carried out via a high-performance computer cluster utilizing the Fire Dynamic Simulator (FDS). Numerous previous studies have demonstrated its dependability [19][20][21][22][23][24][25].…”

Section: Numerical Simulationmentioning

confidence: 98%

A Study on the Behavior Characteristics of Air Supply during Tunnel Fires under Natural Ventilation with Multiple Vertical Shafts

He,

Ming,

Liao

et al. 2023

Fire

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This study investigates the behavior of air supply in tunnels with multiple vertical shafts during fire incidents, focusing on natural ventilation dynamics. Numerical simulation is utilized to analyze the effect of different variables on air supply within vertical shafts. The findings reveal that the position of the smoke front significantly influences the direction and flow rate of gases during fire development. The mass flow rate of air supply during the stable fire development stage is influenced by the geometric size and positioning of vertical shafts, with shafts closer to the fire source exhibiting higher air flow rates. To address this issue, this study introduces a predictive model for estimating air flow rates in vertical shafts. This model exhibits a high level of accuracy when compared to simulations, offering a reliable method for predicting air flow rates based on the geometric characteristics of vertical shafts. Overall, this research contributes to understanding the complexities of air supply in tunnels with multiple vertical shafts, aiding in the improvement of natural ventilation strategies during fire incidents.

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Section: Numerical Simulationmentioning

confidence: 98%

A Study on the Behavior Characteristics of Air Supply during Tunnel Fires under Natural Ventilation with Multiple Vertical Shafts

He,

Ming,

Liao

et al. 2023

Fire

View full text Add to dashboard Cite

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“…3 The Fire Dynamics Simulator (FDS) was applied in the current work, which has been widely applied to the area of tunnel fire safety. [18][19][20] Moreover, the numerical simulation of tunnel fires also has been widely reported to study the maximum temperature, 21,22 critical velocity, 23,24 smoke temperature distribution, 25,26 smoke layer behavior, [27][28][29] vertical temperature profile, 30 and other characteristic parameters. 31,32 The main simulation software used in tunnel fire is FDS and its feasibility has been widely verified by many scholars, 33 which is known as a practical tool to simulate fire-induced environment.…”

Section: Introductionmentioning

confidence: 99%

Study on the smoke evolution mechanism of a subway tunnel with a multi‐door carriage fire under longitudinal ventilation

Wu,

Peng,

Zhou

et al. 2023

Fire and Materials

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This paper has analyzed the longitudinal ventilation on the effect of the efficiency of the smoke evolution mechanism in a metro tunnel of multi‐window carriage fires. These were simulated by Large Eddy Simulation (LES) with Fire Dynamics Simulator (FDS). In the past, analyses of smoke temperature under the tunnel ceiling and smoke overflow characteristics have been conducted. However, longitudinal ventilation has a different impact on temperature than natural ventilation, especially in a subway tunnel with a multi‐door carriage fire. Consequently, several simulations were run in a subway tunnel (360‐m long, 6.0‐m wide, and 4.8‐m high). The longitudinal ventilation velocity is set by 0–10 m/s with the heat release rate of 1–10 MW. The results show that there is a linear relationship between the maximum temperature and the longitudinal ventilation velocity. An empirical model considering various longitudinal ventilation velocities was developed to predict the maximum smoke temperature underneath the subway tunnel ceiling. The effects of the longitudinal ventilation velocity, the heat release rate, and the distance of the fire source on the characteristics of longitudinal temperature distribution were analyzed. What's more, smoke overflow characteristics under different longitudinal ventilation velocities have been described. The findings and results can also provide a reference for the fire risk assessment of a metro tunnel of multi‐window carriage fires.

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The influence of cross‐sectional aspect ratio on ceiling temperature profile and mass flow rate of ceiling jet in tunnel fires

Zhao,

Gao,

et al. 2024

Fire and Materials

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In this paper, the influence of tunnel cross‐sectional aspect ratio on the ceiling temperature profile and mass flow rate (MFR) of ceiling jet is studied theoretically and numerically, and 13 tunnel cross sections with different aspect ratios () are considered. A total of 26 full‐scale numerical simulation cases are conducted using Fire Dynamics Simulator, and small‐scale experiments are used to verify the accuracy of the simulations. Results show that the maximum ceiling temperature is more sensitive to the tunnel height and decreases with increasing aspect ratio, which can be divided into two regions, <1 and ≥1. When ≥1, the maximum ceiling temperature varies more linearly. The initial locations of the one‐dimensional spread for the tunnel with different tunnel cross‐sectional aspect ratios are similar, which are concentrated at 15–20 m from the fire source when taking the MFR increase rate of 0.001 as the criterion. By introducing the sectional coefficient, the MFR model and temperature attenuation model of ceiling jet are developed for the tunnels with <1 and ≥1, respectively. The results of this paper could provide definite reference value for the smoke control in tunnel fires.

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Numerical Investigation on the length of the near-field region of smoke flow in tunnel fires

Cited by 18 publications

References 39 publications

A Study on the Behavior Characteristics of Air Supply during Tunnel Fires under Natural Ventilation with Multiple Vertical Shafts

A Study on the Behavior Characteristics of Air Supply during Tunnel Fires under Natural Ventilation with Multiple Vertical Shafts

Study on the smoke evolution mechanism of a subway tunnel with a multi‐door carriage fire under longitudinal ventilation

The influence of cross‐sectional aspect ratio on ceiling temperature profile and mass flow rate of ceiling jet in tunnel fires

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