Effectiveness of Smoke Confinement of Air Curtain in Tunnel Fire

Gao, Dongli; Li, Tao; Mei, Xiujuan; Chen, Zinan; You, Shuhang; Wang, Zhongkuan; Wang, Kaihong; Lin, Ping

doi:10.1007/s10694-020-00977-z

Cited by 24 publications

(4 citation statements)

References 21 publications

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“…Chen et al combined theoretical analysis and simulation to study the temperature change and the longitudinal variation law of heat decay in the tunnel under the conditions of natural ventilation and air curtains, and the results showed that the air curtain can effectively isolate the diffusion of heat flow [18]. Gao et al conducted full-scale experiments in the tunnel to determine the appropriate air curtain jet velocity to prevent the spread of smoke, and found the relationship between the design parameters of air curtains (jet velocity, jet angle, thickness) and heat release rate through Fluent [19].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Smoke Prevention Performance of Air Curtains in an Island-Type Subway Station

Yan

Yang²,

Mo³

et al. 2023

Fire

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Subway fires are a major threat to the safe and smooth operation of subway stations. In this paper, an island-type subway station was taken as an example to conduct a series of numerical simulations using Fire Dynamics Simulator (FDS). The temperature, visibility, and CO concentration in the subway station were analysed under different thicknesses and jet velocities of the air curtains. The smoke-prevention performance of the air curtains in the subway station was investigated. As the thickness and jet velocity increase, the flame tilts significantly, which greatly hinders the spread of smoke toward the stairs. The smoke temperature and CO concentration on the left side of the air curtains gradually decrease, while the visibility increases significantly. For a 3 MW fire scenario, to satisfy the evaluation criteria, the results show that the thickness of the air curtains needs to be at least 0.3 m, and the jet velocity needs to be at least 2 m/s. The sealing effectiveness (Esealing) tends to increase and then remains constant with increasing momentum, and the maximum is obtained when the momentum of the air curtains (Ia) is 12.5 kg·m/s2. Meanwhile, it is found that an energy-saving efficiency of 85.2% can be achieved by replacing positive pressure ventilation with air curtains. The results of this work can provide a significant reference for the design of smoke protection in subway stations.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation on the Smoke Prevention Performance of Air Curtains in an Island-Type Subway Station

Yan

Yang²,

Mo³

et al. 2023

Fire

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“…The first two are constrained by the limitations of the environment or building conditions, so the smoke exhaust effect is bad [23]. Air curtain smoke control technology easily negatively affects the evacuation of people in underground confined spaces [24][25][26][27][28][29]. Water mist smoke reduction technology exhibits low smoke capture efficiency, leading to elevated CO concentrations within the evacuation channel and reduced smoke height.…”

Section: Introductionmentioning

confidence: 99%

Research and development of foam smoke reduction device for underground confined spaces

Wang,

Li,

Zhu

et al. 2024

Journal of Intelligent Construction

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Keywordsfoam smoke reduction fire smoke control underground confined spaces risk management Smoke control technology is crucial in the risk management of fire in underground confined spaces. In this study, the integrated foam smoke reduction device (FS-RD) of "foaming-spraying" is proposed in response to the challenging problem of smoke control of fire in underground confined spaces. The overall structure of FSRD device is designed and optimized through the numerical simulation of the internal flow field and experimental research. The optimal basic parameters are as follows: area ratio (R m ) of 20.25, pitch-to-diameter ratio (R td ) of 1/3 or 5/9, and throat diameter (d 3 ) of 18 mm . Additionally, the throat-nozzle distance (L t ) is 12 mm, and the operating pressure (p 0 ) is 3.0 MPa. Finally, the smoke reduction experiment verified that the FSRD designed in this study had a better effect of elimination than fine water mist and cylindrical foam jet, with the elimination efficiency reaching 36.73%. This study provides a new device for smoke reduction in controlling fires in underground confined spaces.

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“…Fire curtains are widely used in the design of underground structures, including tunnels. Gao and co. [6] conducted full-scale tests in a tunnel 140 m long, 5.0 m to 5.9 m high and 5.8 m to 10.8 m wide. A 200 mm wide air curtain covering the entire side of the tunnel was installed under the tunnel ceiling.…”

Section: Introductionmentioning

confidence: 99%

The Fire Resistance of Transformable Barriers: Influence of the Large-Scale Factor

Gravit,

Shabunina,

Nedryshkin

2023

Fire

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The paper presents the results of the development of a multi-layer protective product, which is a transformable fire barrier, installed in buildings and structures to limit the spread of flame, heat flow and smoke. Based on the results of the simulation of eight samples of fire curtains, three promising samples of different compositions were selected, demonstrating a fire resistance limit on the loss of thermal insulating capacity (I) of 30 min. During the small-scale tests, it was found that the multilayer fabric of the following composition was promising: heat-treated silica fabric, aluminum foil, mineral fiber heat insulation material, stitched by needle-punching with silica thread, fabric reinforced with fiberglass mesh and stitched through with basalt thread, with seams treated with a fire-resistant elastic sealant. According to the results of a standard large-scale experimental study, a fire curtain with a loss of integrity not less than 60 min, and a loss of thermal insulating ability not less than 15 min were obtained. The results of the study assess the impact of the scale factor on the fire resistance limit of fire curtains in a fire.

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Effectiveness of Smoke Confinement of Air Curtain in Tunnel Fire

Cited by 24 publications

References 21 publications

Numerical Simulation on the Smoke Prevention Performance of Air Curtains in an Island-Type Subway Station

Numerical Simulation on the Smoke Prevention Performance of Air Curtains in an Island-Type Subway Station

Research and development of foam smoke reduction device for underground confined spaces

The Fire Resistance of Transformable Barriers: Influence of the Large-Scale Factor

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