Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel

Case Studies in Thermal Engineering

Yanhua Tang¹  Kai Liang²  Tao Wang³  Zhe Wang⁴  Weiguang An⁵ 

[1] Corresponding author. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, No. 1 University Road, Xuzhou, Jiangsu 221116, China.;Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China;Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China;Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China;State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, No. 1 University Road, Xuzhou, Jiangsu, 221116, China;

关键词: Flame characteristics;    Fire hazard;    Multilayer cables;    Utility tunnel;    Flame spread;    Temperature distribution;   

DOI  :  

来源: DOAJ

【 摘 要 】

Fire safety of utility tunnel, which is significantly affected with cables, has arouse public concern. This work experimentally investigated influences of interlayer distance (d) and cable spacing (s) on flame characteristics and fire hazard of multilayer cables in utility tunnel. Larger interlayer distance leads to higher flame height but lower flame width. The flame width decreases with an increase in cable spacing, while the flame height increases first and then reduces. The flame height reaches the highest value when s = 1.0 cm. Flame spread rate (vf) progressively increases from bottom layer to the top when d = 4.5–7.0 cm, while the trend is inverse for d = 9.5–10 cm vf over the middle layer presents the lowest value when s = 1.0–2.5 cm, while vf gradually reduces from the bottom layer to the top for s = 3–4 cm. The maximum temperature of the pyrolysis zone of top cable layer gradually decreases as d rises, but rises in the bottom layer. When s = 1.0–2.5 cm, the highest temperature is observed in the middle cable layer, while in the top layer when s = 3–4 cm.

【 授权许可】

Unknown