Citation

Wang Q, Zhou T, Liu Q, He P, Tao C, Shi Q. Environ. Sci. Pollut. Res. Int. 2019; 26(23): 23319-23327.

Affiliation

School of Automotive and Transportation Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China. shiqin@hfut.edu.cn.

Copyright

(Copyright © 2019, Holtzbrinck Springer Nature Publishing Group)

DOI

10.1007/s11356-019-05549-5

PMID

31197666

Abstract

Traffic accident may bring vehicle fire in the street canyons. With its high temperature and numerous hazardous materials, the smoke produced by the vehicle fire may cause serious damage to the human body and the properties nearby, such as the glass curtain walls of buildings. The influence of the ambient air flow speed and street aspect ratio on the dispersion of fire smoke in street canyon has been analyzed by FDS software and theoretical analysis in this study. The impact of different windward building heights and different ambient air flow speeds u₀ on the fire smoke were investigated. The results show that the fire smoke tilts towards the opposing direction of the ambient air flow within the street canyon, while the ambient air flow is perpendicular to the windward building. The results indicate that the critical re-entrainment velocity decreases at first, and then increases until it attains a constant with the building height ratio H₁/H₂. Finally, a predictive model of the critical re-entrainment velocity was developed under different building height ratios H₁/H₂.

Language: en

Keywords

Building height; Critical re-entrainment velocity; Fire smoke; Street canyon