| 低压下近熄灭极限区域纸火蔓延实验研究 |
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| 引用本文： | 何选择,方俊,王静舞,薛岩,赵思威. 低压下近熄灭极限区域纸火蔓延实验研究[J]. 火灾科学, 2017, 26(4): 198-203 |
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| 作者姓名： | 何选择 方俊 王静舞 薛岩 赵思威 |
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| 作者单位： | 中国科学技术大学火灾科学国家重点实验室, 合肥, 230026;中国科学技术大学火灾科学国家重点实验室, 合肥, 230026;中国科学技术大学火灾科学国家重点实验室, 合肥, 230026;中国科学技术大学火灾科学国家重点实验室, 合肥, 230026;中国科学技术大学火灾科学国家重点实验室, 合肥, 230026 |
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| 基金项目： | 国家自然科学基金项目（51636008, 51576186, 51323010）；国家重点研发计划项目（2016YFC0801504）；中央高校基本科研业务费专项资金（WK2320000036） |
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| 摘 要： | 对低压下的近熄灭极限区域水平纸火蔓延进行了实验研究。通过降低环境压力和氧气浓度,确定了水平纸火蔓延的着火极限,并得出了在极限氧气浓度条件下的火蔓延速度变化规律。在相同氧气浓度下(43%)进行了不同压力的水平纸火蔓延实验。结果表明,火蔓延速度在近熄灭极限区域内非线性增加,通过比较分析前人火蔓延速度实验结果,确定了火蔓延近熄灭极限区域和线性增长区域的分界压力值。此外,得出了压力分界处的火焰变化特征,并根据火焰图像与理论分析,得出了不同区域内的火蔓延传热机制。
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| 关 键 词： | 火蔓延速度；低压；近熄灭极限；热传递 |
| 收稿时间： | 2017-02-21 |
| 修稿时间： | 2017-04-13 |
Subatmospheric flame spread over paper near extinction limits |
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| HE Xuanze,FANG Jun,WANG Jingwu,XUE Yan and ZHAO Siwei. Subatmospheric flame spread over paper near extinction limits[J]. Fire Safety Science, 2017, 26(4): 198-203 |
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| Authors: | HE Xuanze FANG Jun WANG Jingwu XUE Yan ZHAO Siwei |
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| Affiliation: | State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | In this study, experiments of flame spread over paper samples near extinction limits in sub-atmospheric pressure are carried out. A flammability map with O2 concentration and pressure is generated in quiescent environment and the characteristics of flame spread rate with LOC versus pressure are analyzed. Experiments in different pressure with oxygen concentration of 43% are also studied. For a given oxygen concentration, the results show flame spread rate increases rapidly in near limits region. The pressure boundary between near limits and linear growth region is obtained by analyzing the flame spread rate data and data in literature. In addition, the changes of flame images near the pressure boundary are investigated. The heat transfer controlled energy of flame spread in different pressure regions is analyzed based on flame images and theory. |
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| Keywords: | Flame spread rate Low air pressure Near limits Heat transfer |
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