Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier
In road tunnel fires, it is essential to keep high smoke extraction efficiency, especially for the immersed tunnels. A new-style inclined smoke barrier was proposed for the improvement of lateral smoke extraction. A series of fire scenarios were investigated with different barrier heights, fire size...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-02-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X2300076X |
| _version_ | 1797936375023009792 |
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| author | Shaogang Zhang Yanli Shi Long Shi Yujian Wu Jinhui Wang Jiahao Liu Yongzheng Yao |
| author_facet | Shaogang Zhang Yanli Shi Long Shi Yujian Wu Jinhui Wang Jiahao Liu Yongzheng Yao |
| author_sort | Shaogang Zhang |
| collection | DOAJ |
| description | In road tunnel fires, it is essential to keep high smoke extraction efficiency, especially for the immersed tunnels. A new-style inclined smoke barrier was proposed for the improvement of lateral smoke extraction. A series of fire scenarios were investigated with different barrier heights, fire sizes, vent aspect ratios and included angles between smoke barrier and tunnel sidewall. Results show that installing an inclined smoke barrier can improve lateral smoke extraction effectively. Overall, a higher inclined smoke barrier contributes to the lateral smoke extraction, and the smoke extraction improvement is better for those cases under smaller fire size; meanwhile the inclined smoke barrier shows a higher efficiency with the narrow and high lateral exhaust vent. The lateral smoke extraction efficiency curve can be divided into three regions along with included angles, namely the rapidly increasing region (0°<θ≤30°), the stable region (30°<θ≤75°), and the slightly decreasing region (75°<θ≤90°). Better smoke extraction efficiency can be guaranteed when 30°<θ≤75°. To further explore the lateral smoke extraction efficiency, an empirical description model is developed to predict the smoke extraction efficiency improvement (IE). The outcomes could offer a basic guidance for the design of lateral smoke extraction system in immersed tunnel. |
| first_indexed | 2024-04-10T18:28:49Z |
| format | Article |
| id | doaj.art-6883e9cf7ec2492186d9669a3f2b7f19 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-10T18:28:49Z |
| publishDate | 2023-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-6883e9cf7ec2492186d9669a3f2b7f192023-02-02T04:49:00ZengElsevierCase Studies in Thermal Engineering2214-157X2023-02-0142102770Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrierShaogang Zhang0Yanli Shi1Long Shi2Yujian Wu3Jinhui Wang4Jiahao Liu5Yongzheng Yao6College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China; SMU-CMU Safety Technology Joint Research Center, Shanghai, 201306, PR ChinaCollege of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR ChinaState Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 232001, ChinaCollege of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR ChinaCollege of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China; SMU-CMU Safety Technology Joint Research Center, Shanghai, 201306, PR ChinaCollege of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China; SMU-CMU Safety Technology Joint Research Center, Shanghai, 201306, PR China; Corresponding author. College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, China.School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, PR China; Corresponding author. School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, PR China.In road tunnel fires, it is essential to keep high smoke extraction efficiency, especially for the immersed tunnels. A new-style inclined smoke barrier was proposed for the improvement of lateral smoke extraction. A series of fire scenarios were investigated with different barrier heights, fire sizes, vent aspect ratios and included angles between smoke barrier and tunnel sidewall. Results show that installing an inclined smoke barrier can improve lateral smoke extraction effectively. Overall, a higher inclined smoke barrier contributes to the lateral smoke extraction, and the smoke extraction improvement is better for those cases under smaller fire size; meanwhile the inclined smoke barrier shows a higher efficiency with the narrow and high lateral exhaust vent. The lateral smoke extraction efficiency curve can be divided into three regions along with included angles, namely the rapidly increasing region (0°<θ≤30°), the stable region (30°<θ≤75°), and the slightly decreasing region (75°<θ≤90°). Better smoke extraction efficiency can be guaranteed when 30°<θ≤75°. To further explore the lateral smoke extraction efficiency, an empirical description model is developed to predict the smoke extraction efficiency improvement (IE). The outcomes could offer a basic guidance for the design of lateral smoke extraction system in immersed tunnel.http://www.sciencedirect.com/science/article/pii/S2214157X2300076XImmersed road tunnelInclined smoke barrierLateral centralized smoke extractionSmoke extraction improvementCFD |
| spellingShingle | Shaogang Zhang Yanli Shi Long Shi Yujian Wu Jinhui Wang Jiahao Liu Yongzheng Yao Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier Case Studies in Thermal Engineering Immersed road tunnel Inclined smoke barrier Lateral centralized smoke extraction Smoke extraction improvement CFD |
| title | Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier |
| title_full | Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier |
| title_fullStr | Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier |
| title_full_unstemmed | Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier |
| title_short | Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier |
| title_sort | numerical study on lateral centralized smoke extraction in immersed tunnel with a new style inclined smoke barrier |
| topic | Immersed road tunnel Inclined smoke barrier Lateral centralized smoke extraction Smoke extraction improvement CFD |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X2300076X |
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