Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier

Shaogang Zhang; Yanli Shi; Long Shi; Yujian Wu; Jinhui Wang; Jiahao Liu; Yongzheng Yao

Case Studies in Thermal Engineering (Feb 2023)

Numerical study on lateral centralized smoke extraction in immersed tunnel with a new-style inclined smoke barrier

Shaogang Zhang,
Yanli Shi,
Long Shi,
Yujian Wu,
Jinhui Wang,
Jiahao Liu,
Yongzheng Yao

Affiliations

Shaogang Zhang: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China; SMU-CMU Safety Technology Joint Research Center, Shanghai, 201306, PR China
Yanli Shi: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China
Long Shi: State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 232001, China
Yujian Wu: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China
Jinhui Wang: College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, 201306, PR China; SMU-CMU Safety Technology Joint Research Center, Shanghai, 201306, PR China
Jiahao Liu: College 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.
Yongzheng Yao: 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.

Journal volume & issue: Vol. 42
p. 102770

Abstract

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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.

Published in Case Studies in Thermal Engineering

ISSN: 2214-157X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/case-studies-in-thermal-engineering/

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