Citation

Da L, Xie Q, Luo S. China Saf. Sci. J. 2019; 29(11): 64-70.

Copyright

(Copyright © 2019, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2019.11.011

PMID

unavailable

Abstract

For the sake of studying development characteristics of thermoplastic sheets' flame spread after central ignition, a series of experiments were conducted on square XPS foam sheets at different inclination angles, and correlation between flame spread condition, velocity and the internal temperature was analyzed. The results show that the shrinkage after central ignition causes change of energy received in preheated zone, thus making upward flame spread more difficult along sheets with bigger inclination angle. In addition, when inclination angle is getting greater, velocities of upward flame spread increase, which is also greater than those of downward and horizontal flame spread. Besides, velocities of downward flame spread decrease firstly and then increase while horizontal flame spread velocities are less affected by inclination angle. It is also found that flame spread is sustainable if there is a violent temperature rise after heating. On the contrary, it is easy to extinguish if XPS foam shrinks significantly with a slow temperature rise. © 2019 China Safety Science Journal. All rights reserved.

Language: zh