Citation

Chen X, Zhi X, Liu L, Lei S, Zhang H, Sun W. China Saf. Sci. J. 2021; 31(12): 39-44.

Copyright

(Copyright © 2021, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2021.12.006

PMID

unavailable

Abstract

In order to study influence of pressure relief strength and concentration gradient on explosion characteristics of methane / air premixed gas, an experiment in a square flame propagation test pipeline system was carried out for premixed gas whose pressure relief strength was 30, 60 and 90 kPa and concentration gradient was 1%. The results show that as pressure relief intensity grows, the time for flame to pass through observation window increases gradually. And flame propagation presents a reciprocating oscillation phenomenon after rupture of pressure relief film. Due to existence of concentration gradient, measured temperature and pressure peak values inside pipes are significantly improved. When pressure relief intensity is low, vent burst pressure effects after film rupture dominates the changes in peak temperature and pressure which, however was dominated by excitation effect of concentration gradient on explosion reaction when pressure relief intensity increases. © 2020 China Safety Science Journal. All rights reserved.

Language: zh