Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study
Several fire tests were performed in a 1/7 model tunnel to explore the potentially reflash issue after blocking tunnel fire, and the temperature right above fire source, temperature distribution inside tunnel and radiant heat flux near tunnel portal were acquired. Results show that the occurrence co...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-10-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X22005822 |
| _version_ | 1798002142986895360 |
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| author | Jiaming Zhao Zhisheng Xu Lei Fang Yulun Zhang Chengbo Yu |
| author_facet | Jiaming Zhao Zhisheng Xu Lei Fang Yulun Zhang Chengbo Yu |
| author_sort | Jiaming Zhao |
| collection | DOAJ |
| description | Several fire tests were performed in a 1/7 model tunnel to explore the potentially reflash issue after blocking tunnel fire, and the temperature right above fire source, temperature distribution inside tunnel and radiant heat flux near tunnel portal were acquired. Results show that the occurrence conditions of tunnel fire reflash is mainly related to the amount of combustible vapor accumulated in the internal space and temperature level near fire source. Improper portal-opening moment will induce the reflash in such channel-like structure fire scenarios. In current experiment, when the both portals were suddenly opened, the ceiling temperature right above fire source of not less than 280 oC and liquid pool area of not less than 0.35 m2 are one of the necessary conditions for the reflash occurrence. For the cases with large liquid fuel pool, the obvious thermal plume and flame will overflow out portals when reflash occurred. Within the scope of current test, maximum radiant heat flux near portals induced by reflash reaches 505.5 W/m2. This work can provide some reference for the understanding of reflash feature of large-area fire and the corresponding emergency treatment of inside channel-like structure. |
| first_indexed | 2024-04-11T11:47:28Z |
| format | Article |
| id | doaj.art-405c06eb3ffd4ccbbc6a5e206cb45560 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-04-11T11:47:28Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-405c06eb3ffd4ccbbc6a5e206cb455602022-12-22T04:25:30ZengElsevierCase Studies in Thermal Engineering2214-157X2022-10-0138102342Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case studyJiaming Zhao0Zhisheng Xu1Lei Fang2Yulun Zhang3Chengbo Yu4School of Civil Engineering, Central South University, Changsha, 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, 410075, PR ChinaCorresponding author. School of Civil Engineering, Central South University, Changsha, Hunan, 410075, PR China.; School of Civil Engineering, Central South University, Changsha, 410075, PR ChinaSchool of Civil Engineering, Central South University, Changsha, 410075, PR ChinaSeveral fire tests were performed in a 1/7 model tunnel to explore the potentially reflash issue after blocking tunnel fire, and the temperature right above fire source, temperature distribution inside tunnel and radiant heat flux near tunnel portal were acquired. Results show that the occurrence conditions of tunnel fire reflash is mainly related to the amount of combustible vapor accumulated in the internal space and temperature level near fire source. Improper portal-opening moment will induce the reflash in such channel-like structure fire scenarios. In current experiment, when the both portals were suddenly opened, the ceiling temperature right above fire source of not less than 280 oC and liquid pool area of not less than 0.35 m2 are one of the necessary conditions for the reflash occurrence. For the cases with large liquid fuel pool, the obvious thermal plume and flame will overflow out portals when reflash occurred. Within the scope of current test, maximum radiant heat flux near portals induced by reflash reaches 505.5 W/m2. This work can provide some reference for the understanding of reflash feature of large-area fire and the corresponding emergency treatment of inside channel-like structure.http://www.sciencedirect.com/science/article/pii/S2214157X22005822Large-area liquid fireBlockingTunnel-like structureReflash |
| spellingShingle | Jiaming Zhao Zhisheng Xu Lei Fang Yulun Zhang Chengbo Yu Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study Case Studies in Thermal Engineering Large-area liquid fire Blocking Tunnel-like structure Reflash |
| title | Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study |
| title_full | Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study |
| title_fullStr | Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study |
| title_full_unstemmed | Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study |
| title_short | Analyzing the reflash feature of large-area liquid fire in channel-like structures: A case study |
| title_sort | analyzing the reflash feature of large area liquid fire in channel like structures a case study |
| topic | Large-area liquid fire Blocking Tunnel-like structure Reflash |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X22005822 |
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