Numerical simulation research on combustion process of heat sources inside cables in pipe gallery

doi:10.16265/j.cnki.issn1003-3033.2023.10.1317

Abstract

Abstract:

In order to study the combustion process of the cable in the local space of the unity tunnel under an internal heat source, the ignition process of the 15 kV copper core cable was analyzed by using the 3D heat transfer and pyrolysis model of fire dynamics simulator(FDS). By analyzing the cable temperature distribution, pyrolysis gas distribution and heat release rate(HRR)curve under different conditions, the influence of the power and duration of the heat source on the cable combustion process was studied in detail. The results show that with the increase of heat source power, the cable ignition time is shortened, and the fire risk increases. The peak HRR and maximum fire spread length(FSL) increase linearly with the increase of heat source power. Blocking the heat source power in time can effectively prevent the occurrence of fire. The flame remaining time shows a trend of rising first and then falling as the duration of the heat source power increases.

Key words: pipe gallery, cable fire, heat source power, combustion process, numerical simulation, flame spread, flame residue

ZHONG Wei, GUO Chaojie, MA Wenhui, GAO Zihe. Numerical simulation research on combustion process of heat sources inside cables in pipe gallery[J]. China Safety Science Journal, 2023, 33(10): 86-93.

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材料	厚度/ mm	密度/ (kg· m^-3)	比热容/ (J· kg^-1·K)	热导率/ (W· m^-1·K)	电阻/ (Ω· m^-1)
Cr-Ni	0.225	8 400	455	12.171	5.5
聚乙烯	0.15	965	2 300	0.35	—