Reduced pressure effects on smoke temperature, CO concentration and smoke extraction in tunnel fires with longitudinal ventilation and vertical shaft

Wang, Jie; Kong, Xiaowei; Fan, Yongjie; Jiang, Xuepeng; Lu, Kaihua

doi:10.1016/j.csite.2022.102311

Cited by 16 publications

(4 citation statements)

References 33 publications

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“…During the simulation, blocked vehicles serve as obstacles, taking into account the most unfavorable conditions for personnel evacuation under traffic congestion. The passenger capacity of the vehicles is set based on the research results of Wang Jie et al [ 36 ]. The distance between vehicles is set to 1.5 m and 2.0 m respectively according to the size of the vehicle model.…”

Section: Mathematical Model Solving and Simulation Verificationmentioning

confidence: 99%

Research on the evacuation of people from a road tunnel fire based on a mathematical model

Zhang,

Zhu,

Haotian

et al. 2024

Heliyon

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Section: Mathematical Model Solving and Simulation Verificationmentioning

confidence: 99%

Research on the evacuation of people from a road tunnel fire based on a mathematical model

Zhang,

Zhu,

Haotian

et al. 2024

Heliyon

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“…In addition, through literature review, it is also found that most of the existing works focus on the effects of low pressure environment on the combustion characteristics of fuels such as methane, the combustion characteristics of batteries, the smoke exhaust of tunnel shaft, the fire in mine tunnels, or the combustion of aircraft cargo cabin, etc. [15][16][17][18]. Studies concerning the smoke exhaust of semilateral tunnels are mostly in plain areas [19][20][21], while the report of smoke exhaust of semi-lateral tunnels is rarely seen.…”

Section: Introductionmentioning

confidence: 99%

Effects of Altitude on Fire Smoke Diffusion in Semi-Lateral Smoke Exhaust Highway Tunnels

2023

Teh. vjesn.

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This paper aims to study the effects of altitude and the size of smoke outlet on fire smoke diffusion and discharge in semi-lateral smoke exhaust highway tunnels. At first, simulations of semi-lateral smoke exhaust highway tunnels were carried out in FDS (Fire Dynamics Simulator), then the distribution laws of temperature, CO concentration, smoke mass flow, and visibility in the tunnel under the conditions of different altitudes and smoke outlet areas were analyzed to figure out the effects of altitude and size of smoke outlet on fire smoke diffusion and discharge in the said tunnels. The results suggest that, in case of the same fire source power, the velocity of smoke diffusion increases with the altitude; for curves of different altitudes, the tunnel roof temperature features are basically the same, that is, the higher the altitude, the higher the temperature at the tunnel roof. When the fire source power is 20 MW, the smoke mass flow at the smoke outlet decreases with the increase of altitude, but the CO concentration grows with it, indicating that the smoke exhaust efficiency is higher in high-altitude areas. When the altitude reaches 4200 m and the fire source power is 20 MW, with the increase of smoke outlet area, the smoke discharge effect of the tunnel shows an upward trend, taking both the smoke discharge effect and economy into consideration; the smoke outlet should take a size of 4  3 m.

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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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Reduced pressure effects on smoke temperature, CO concentration and smoke extraction in tunnel fires with longitudinal ventilation and vertical shaft

Cited by 16 publications

References 33 publications

Research on the evacuation of people from a road tunnel fire based on a mathematical model

Research on the evacuation of people from a road tunnel fire based on a mathematical model

Effects of Altitude on Fire Smoke Diffusion in Semi-Lateral Smoke Exhaust Highway Tunnels

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

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