Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel
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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2020-12-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X20305268 |
| _version_ | 1818611630702854144 |
|---|---|
| author | Weiguang An Tao Wang Kai Liang Yanhua Tang Zhe Wang |
| author_facet | Weiguang An Tao Wang Kai Liang Yanhua Tang Zhe Wang |
| author_sort | Weiguang An |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-16T15:33:23Z |
| format | Article |
| id | doaj.art-b4dd9b2f844241da9d03cd35d71621ae |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-16T15:33:23Z |
| publishDate | 2020-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-b4dd9b2f844241da9d03cd35d71621ae2022-12-21T22:26:16ZengElsevierCase Studies in Thermal Engineering2214-157X2020-12-0122100784Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnelWeiguang An0Tao Wang1Kai Liang2Yanhua Tang3Zhe Wang4State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, No. 1 University Road, Xuzhou, Jiangsu, 221116, China; Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China; 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.Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, ChinaKey Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, ChinaKey Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, ChinaKey Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China; Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou, 221116, China; Corresponding author. Jiangsu Key Laboratory of Fire Safety in Urban Underground Space (China University of Mining and Technology), Xuzhou 221116, China.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.http://www.sciencedirect.com/science/article/pii/S2214157X20305268Flame characteristicsFire hazardMultilayer cablesUtility tunnelFlame spreadTemperature distribution |
| spellingShingle | Weiguang An Tao Wang Kai Liang Yanhua Tang Zhe Wang Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel Case Studies in Thermal Engineering Flame characteristics Fire hazard Multilayer cables Utility tunnel Flame spread Temperature distribution |
| title | Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| title_full | Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| title_fullStr | Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| title_full_unstemmed | Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| title_short | Effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| title_sort | effects of interlayer distance and cable spacing on flame characteristics and fire hazard of multilayer cables in utility tunnel |
| topic | Flame characteristics Fire hazard Multilayer cables Utility tunnel Flame spread Temperature distribution |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X20305268 |
| work_keys_str_mv | AT weiguangan effectsofinterlayerdistanceandcablespacingonflamecharacteristicsandfirehazardofmultilayercablesinutilitytunnel AT taowang effectsofinterlayerdistanceandcablespacingonflamecharacteristicsandfirehazardofmultilayercablesinutilitytunnel AT kailiang effectsofinterlayerdistanceandcablespacingonflamecharacteristicsandfirehazardofmultilayercablesinutilitytunnel AT yanhuatang effectsofinterlayerdistanceandcablespacingonflamecharacteristicsandfirehazardofmultilayercablesinutilitytunnel AT zhewang effectsofinterlayerdistanceandcablespacingonflamecharacteristicsandfirehazardofmultilayercablesinutilitytunnel |