Citation

Huang Q, Mu C, Wang Y, Zhou H, Li Z. China Saf. Sci. J. 2020; 30(11): 101-107.

Copyright

(Copyright © 2020, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2020.11.015

PMID

unavailable

Abstract

In order to explore propagation characteristics of gas with different volume fractions in explosion chambers and venting characteristics of 90° elbows, a gas venting experiment was carried out. Numerical simulation and experimental research were used to analyze propagation process of explosive blast in system, and variation characteristics of blast and flame size of six groups of gas at different volume fraction were explored. The results show that propagation of explosion shock wave in pipeline is in the form of multiple overpressure, and its peak overpressure gradually decreases. Additionally, peak overpressure and its rising rate in explosion cavity have the same change trend, and both reach maximum when gas volume fraction is 9. 5%. At the same position in 90°elbows, peak overpressure rising rate generated by different volume fractions of gas is in a sawtooth shape. When it is 5. 8%-11. 0%, flame size varies in a sawtooth shape along with propagation distance. When at 5. 8% and 6. 5%, flame is extinguished before 90°. When between 5. 8% and 11%, peak overpressure and flame size are significantly attenuated after pipe is bent at 90°. © 2020 China Safety Science Journal

Language: zh