Influences of inclined tunnel ceiling on plug‐holing phenomenon and mechanical smoke exhaust efficiency in tunnel fires

Zhao, Wei; Wang, Tianxiong; He, Lu; Tao, Haowen; Xu, Zhisheng

doi:10.1002/fam.3028

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…However, the smoke blocking effect of conventional roof structures (such as fixed smoke screens) is limited after all. In recent years, in order to improve the smoke-block effect of smoke-block structures, some studies have begun to explore smoke screens with different geometric parameters, such as inclined smoke screens [17,18] and multiple smoke screen combinations [19,20]. In the previous research, the authors pointed out that the multi-roof structure has a better smoke blocking effect than the single-roof structure, and it is suitable for firefighting reconstruction in areas such as narrow corridors of old buildings where the smoke exhaust system is difficult to improve [21,22].…”

Section: Introductionmentioning

confidence: 99%

Research on the Optimal Spacing of Multiple Roof Smoke Blocking Structures in a Long Corridor

Wu,

Wang,

Shao

et al. 2024

Fire

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In a long and narrow corridor, the installation of roof smoke blocking structures is a measure to slow down the spread of fire smoke. When employing multiple smoke blocking structures, the spacing between these structures is a critical parameter that needs to be considered for optimal effectiveness. This paper analyzes the smoke blocking performance of double structures at different spacing and measures the smoke flow velocity both upstream and downstream of the double structures. According to the analysis of the smoke velocity vector obtained from numerical simulation, the smoke can be divided into three zones based on the flow state of the smoke after passing through the front smoke screen structure, namely the vortex zone, surge wave zone, and steady flow zone. When the rear smoke screen is located in the surge zone, the smoke blocking effect is optimal. Analysis of the morphology of the smoke layer indicates that the length of the vortex region is directly proportional to the upstream smoke flow velocity. The numerical and experimental results both indicate that an excessively large or small spacing between the structures fails to achieve optimal smoke control effectiveness. When the spacing is within an optimal range, the smoke velocity is the lowest. Finally, using a real architectural corridor as a case background, this paper presents a design example of roof smoke blocking structures. In order to arrange as many smoke blocking structures as possible, an appropriate spacing between the structures should be slightly larger than the vortex region. The smoke control effectiveness of multiple roof structures was validated through numerical simulation. As a result, the time required for smoke to pass through the corridor increases by 110 s.

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Section: Introductionmentioning

confidence: 99%

Research on the Optimal Spacing of Multiple Roof Smoke Blocking Structures in a Long Corridor

Wu,

Wang,

Shao

et al. 2024

Fire

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Large-scale experimental study on the average temperature distribution model of fire smoke under mechanical ventilation in the flat space

Lin,

Li,

et al. 2024

International Journal of Thermal Sciences

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Research on smoke control for an underground mall fire, based on smoke barrier and mechanical smoke exhaust system

Jia

Xiuyuan

Feng-xiao

2022

Sci Rep

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This study examines smoke spread in an underground mall fire under the composite smoke control mode of a smoke barrier and a mechanical smoke exhaust system. The objective is to optimize the selection of smoke containment and exhaust methods in an underground mall in Fuxin City, China. A Fire Dynamics Simulator was used for numerical simulation to investigate the effects of the sagging height and spacing of smoke barriers on smoke containment, as well as the effects of size, number, and arrangement of smoke vents in the mechanical smoke exhaust system on the effectiveness of smoke exhaust. The results indicated that a smoke barrier with a sagging height of 1 m and a spacing of 5 m was effective in preventing the spread of high-temperature smoke. When the sagging height of the smoke barrier increased to 1.2 m, the smoke barrier effect was comparable to that of a 1 m height barrier. Regarding the mechanical smoke exhaust system, the size of the opening area of the smoke vent had no significant effect on the smoke exhaust effect. The best smoke exhaust effect was achieved when the number of smoke vents was 12. Additionally, the double-row setting of smoke vents was more efficient than the single-row setting. Combining a smoke barrier and a mechanical smoke exhaust system can provide a more effective smoke control compared to either system alone. Comprehensively, considering the effectiveness and economy of smoke containment and exhaust, the optimal combination of smoke containment and exhaust was determined to be a smoke barrier with a sagging height of 1 m and spacing of 5 m, and a mechanical smoke exhaust system with 12 smoke vents in a double-row arrangement.

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Influences of inclined tunnel ceiling on plug‐holing phenomenon and mechanical smoke exhaust efficiency in tunnel fires

Cited by 4 publications

References 35 publications

Research on the Optimal Spacing of Multiple Roof Smoke Blocking Structures in a Long Corridor

Research on the Optimal Spacing of Multiple Roof Smoke Blocking Structures in a Long Corridor

Large-scale experimental study on the average temperature distribution model of fire smoke under mechanical ventilation in the flat space

Research on smoke control for an underground mall fire, based on smoke barrier and mechanical smoke exhaust system

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