Citation

Shi B, Mu C, Zhou H, Li Z. China Saf. Sci. J. 2020; 30(3): 87-93.

Copyright

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

DOI

10.16265/j.cnki.issn1003-3033.2020.03.014

PMID

unavailable

Abstract

In order to study influence of relative volume ratio change of cavity on suppression of gas explosion shock wave, experiment was carried out by using Computational Fluid Dynamics (CFD) software and large-scale circular tube methane explosion test system. The results show that cavity's reduction effect on peak overpressure is strengthened as its relative volume ratio changes from 4. 8 to 7. 9, and continuous light intensity reduction of flame is suddenly enhanced. When the ratio increases to 12. 7, fitting results indicate that attenuation factor of flame continuous light intensity presents a "L" curve, general reduction tends to be stable, and attenuation rate rises from 90. 8% to 90. 9%. Attenuation factor of peak overpressure is slow at first and then fast. It is found that cavity's explosion-suppressing effect is the best when its relative volume ratio reaches 12. 7 with an general attenuation rate of continuous light intensity at 90. 9% and and that of peak overpressure at 30.8%. © 2020 China Safety Science Journal. All rights reserved.

Language: zh