Citation

Zhang Z, Zhang G, Zhu G, Yuan D, Guo D. China Saf. Sci. J. 2022; 32(8): 133-139.

Copyright

(Copyright © 2022, China Occupational Safety and Health Association, Publisher Gai Xue bao)

DOI

10.16265/j.cnki.issn1003-3033.2022.08.1891

PMID

unavailable

Abstract

In order to better study the fire extinguishing characteristics of liquid nitrogen, a numerical simulation method of liquid nitrogen fire extinguishing in underground pipe gallery based on Fluent software was proposed and its applicability was studied. First of all, a scaled test platform for liquid nitrogen fire extinguishing of underground pipe gallery was built, and the liquid nitrogen fire extinguishing test was carried out by changing the direction and distance of the nitrogen injection, so as to obtain the input parameters and verification data required for the numerical simulation. Then, the numerical simulation method based on Fluent software was determined, and the corresponding numerical simulation was carried out, and the results were compared. The research results show that the numerical simulation results are in good agreement with the test data. And the variation trend of temperature at different positions of the pipe gallery roof is consistent with the test, and the minimum error is about 4. 7%. The simulation effect of the O2 volume fraction at the bottom of the pipe gallery is related to the nitrogen injection distance, the closer the nitrogen injection distance is, the better the simulation effect is. The minimum error is 0. 3%,and the maximum error is 15. 3%。. © 2022 China Safety Science Journal. All rights reserved.

Language: zh