Numerical study on the influence of subway platform air curtains on smoke diffusion
To control longitudinal smoke spread and increase the time available for evacuation at subway platforms, this paper proposes a system for separating smoke on subway platforms using a combination of external air supply platform air curtains, stair (or escalator) air curtains, and a mechanical smoke e...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-10-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X23007451 |
| _version_ | 1827803597685915648 |
|---|---|
| author | Tianhong Zhang Rubing Han |
| author_facet | Tianhong Zhang Rubing Han |
| author_sort | Tianhong Zhang |
| collection | DOAJ |
| description | To control longitudinal smoke spread and increase the time available for evacuation at subway platforms, this paper proposes a system for separating smoke on subway platforms using a combination of external air supply platform air curtains, stair (or escalator) air curtains, and a mechanical smoke exhaust system. In this paper, CFD simulations are conducted using Fire Dynamics Simulator (FDS) to investigate the impact of various air curtain speeds at a 20° angle on smoke dispersion. The results show that: (1) The system is effective and reasonable, which can effectively prevent longitudinal smoke diffusion in the platform. (2) For the 2.5 MW firepower, when the air curtain speed is between 3 m/s and 5 m/s, the protected area is not affected by smoke. The supplementary cold air from the air curtains mixed and dispersed the heat, leading to a decrease in the temperature of the suspended ceiling above the fire source by approximately one-third, to below 200 °C. (3) For the 5.0 MW firepower, when the air curtain speed is 4 m/s, the protected area is not affected by smoke. The enhanced impact of the air curtain on fire source combustion surpasses the cooling effect of supplementary air. |
| first_indexed | 2024-03-11T20:57:39Z |
| format | Article |
| id | doaj.art-5a897ae95c8b4e65abb512acb7569025 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-03-11T20:57:39Z |
| publishDate | 2023-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-5a897ae95c8b4e65abb512acb75690252023-09-30T04:54:41ZengElsevierCase Studies in Thermal Engineering2214-157X2023-10-0150103439Numerical study on the influence of subway platform air curtains on smoke diffusionTianhong Zhang0Rubing Han1School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, 621010, PR ChinaCorresponding author.; School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, 621010, PR ChinaTo control longitudinal smoke spread and increase the time available for evacuation at subway platforms, this paper proposes a system for separating smoke on subway platforms using a combination of external air supply platform air curtains, stair (or escalator) air curtains, and a mechanical smoke exhaust system. In this paper, CFD simulations are conducted using Fire Dynamics Simulator (FDS) to investigate the impact of various air curtain speeds at a 20° angle on smoke dispersion. The results show that: (1) The system is effective and reasonable, which can effectively prevent longitudinal smoke diffusion in the platform. (2) For the 2.5 MW firepower, when the air curtain speed is between 3 m/s and 5 m/s, the protected area is not affected by smoke. The supplementary cold air from the air curtains mixed and dispersed the heat, leading to a decrease in the temperature of the suspended ceiling above the fire source by approximately one-third, to below 200 °C. (3) For the 5.0 MW firepower, when the air curtain speed is 4 m/s, the protected area is not affected by smoke. The enhanced impact of the air curtain on fire source combustion surpasses the cooling effect of supplementary air.http://www.sciencedirect.com/science/article/pii/S2214157X23007451Subway firePlatform air curtainFire source powerAir curtain outlet velocitySmoke blockage |
| spellingShingle | Tianhong Zhang Rubing Han Numerical study on the influence of subway platform air curtains on smoke diffusion Case Studies in Thermal Engineering Subway fire Platform air curtain Fire source power Air curtain outlet velocity Smoke blockage |
| title | Numerical study on the influence of subway platform air curtains on smoke diffusion |
| title_full | Numerical study on the influence of subway platform air curtains on smoke diffusion |
| title_fullStr | Numerical study on the influence of subway platform air curtains on smoke diffusion |
| title_full_unstemmed | Numerical study on the influence of subway platform air curtains on smoke diffusion |
| title_short | Numerical study on the influence of subway platform air curtains on smoke diffusion |
| title_sort | numerical study on the influence of subway platform air curtains on smoke diffusion |
| topic | Subway fire Platform air curtain Fire source power Air curtain outlet velocity Smoke blockage |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X23007451 |
| work_keys_str_mv | AT tianhongzhang numericalstudyontheinfluenceofsubwayplatformaircurtainsonsmokediffusion AT rubinghan numericalstudyontheinfluenceofsubwayplatformaircurtainsonsmokediffusion |