Investigation on the Effect of Platform Height on Smoke Characteristics of Fire Scenarios for Subway Stations

Sustainability

Jin Zhang¹  Junmei Li²  Desheng Xu²  Jiaxin Li²  Yanfeng Li³ 

[1] Beijing Key Laboratory of Control Technology for City Toxic and Combustible Major Hazards, Beijing Municipal Institute of Labor Protection, Beijing 100054, China;Beijing Key Laboratory of Green Built Environment and Energy Efficient Technology, Beijing University of Technology, Beijing 100124, China;College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China;

关键词: full-scale;    fire experiment;    simulation;    smoke control;   

DOI  :  10.3390/su131910584

来源: DOAJ

【 摘 要 】

In this study, three full-scale experiments and a series of numerical simulations were conducted to investigate the influence of subway platform height and atrium ceiling height of subway stations on smoke control by mechanical exhausting systems. The smoke temperature variation with time, maximum temperature distribution, and smoke stratification were discussed. Results showed that the atrium had capacity to store smoke, especially at the early stage of smoke spread. However, the efficiency of smoke extraction did not increase simply with the rise in platform height and atrium ceiling height, and favorable smoke exhaust velocity was crucial for smoke elimination. The optimal smoke exhaust velocity was studied by numerical simulation and it was found that the area of smoke diffusion in subway stations with a higher platform was significantly smaller under the optimal smoke exhaust velocity. In addition, a prediction model of optimal smoke exhaust velocity with subway platform height was proposed. This study could provide on-site data and smoke spread characteristics for smoke control design, operation, and, significantly, guide safety evacuation of the exhaust system of subway stations.

【 授权许可】

Unknown