Numerical simulation method of liquid nitrogen fire extinguishing in underground pipe gallery based on Fluent

doi:10.16265/j.cnki.issn1003-3033.2022.08.1891

Abstract

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%。

Key words: underground pipe gallery, liquid nitrogen, fire extinguishing test, numerical simulation, Fluent software

ZHANG Zhiwei, ZHANG Guowei, ZHU Guoqing, YUAN Diping, GUO Dong. Numerical simulation method of liquid nitrogen fire extinguishing in underground pipe gallery based on Fluent[J]. China Safety Science Journal, 2022, 32(8): 133-139.

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工况编号	注氮方向	d/m
T₁	竖直向下	0.5
T₂	竖直向下	2.0
T₃	水平	0.5
T₄	水平	2.0