| 甲烷/空气预混气体火焰的传播特征 |
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| 引用本文： | 陈东梁,孙金华,刘义,马晔风,韩学斌.甲烷/空气预混气体火焰的传播特征[J].爆炸与冲击,2008,28(5):385-390. |
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| 作者姓名： | 陈东梁 孙金华 刘义 马晔风 韩学斌 |
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| 作者单位： | 北京化工大学机电工程学院,北京,100029;中国科学技术大学火灾科学国家重点实验室,安徽,合肥,230026;中国科学技术大学火灾科学国家重点实验室,安徽,合肥,230026;中国科学技术大学火灾科学国家重点实验室,安徽,合肥,230026;中国石油大学化学化工学院,山东,东营,257061;北京化工大学机电工程学院,北京,100029 |
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| 基金项目： | 目家自然科学基金，中国科学院"百人计划"项目，北京化工大学青年教师科学研究基金 |
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| 摘 要： | 利用高速纹影摄像等技术探讨了密闭管道内不同当量比的甲烷/空气预混气体火焰的传播特征。结果表明，当甲烷含量接近当量值时，预混气体火焰传播中会发生火焰阵面由向未燃区弯曲到向已燃区弯曲的转折过程，逐渐由层流燃烧转变成湍流燃烧，并形成Tulip火焰结构；当甲烷含量偏离当量值一定程度时，预混火焰呈现出典型的层流燃烧特征，不会发生火焰阵面由向未燃区弯曲到向已燃区弯曲的转折过程。Tulip火焰结构形成于火焰传播速度迅速降低的区间里，且只有当减速阶段的最大加速度的绝对值大于某一数值时才能形成；Tulip火焰结构是预混火焰由层流燃烧向湍流燃烧转变的一个中间过程。
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| 关 键 词： | 爆炸力学 湍流燃烧 高速纹影摄像 甲烷/空气预混火焰 Tulip火焰 |
Propagation characteristics of premixed methane-air flames |
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| CHEN Dong-liang,SUN Jin-hua,LIU Yi,MA Ye-feng,HAN Xue-bin.Propagation characteristics of premixed methane-air flames[J].Explosion and Shock Waves,2008,28(5):385-390. |
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| Authors: | CHEN Dong-liang SUN Jin-hua LIU Yi MA Ye-feng HAN Xue-bin |
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| Affiliation: | 1.College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2.State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, China;3.College of Chemistry and Chemical Engineering, China University of Petroleum, Dongying 257061, Shandong, China |
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| Abstract: | The techniques of the high-speed schlieren photography, etc. were used to investigate the characteristics of the premixed methane-air flames with different equivalence ratios propagating through a closed tube. Based on the experimental results, the combustion behaviors and characteristics of the premixed flames were analyzed. Analyzed results show as follows: (1) the transformation process of the flame front bending to the unburned zone turning into bending to the burned zone during the flame propagation happens while the equivalence ratio volume approaches to 1, thus the typical tulip flame structure forms during the transformation; (2) the transformation process of the flame front does not happen while the equivalence ratio volume deviates from 1 to a certain extent, and the premixed flame shows the typical laminar combustion. (3) the tulip-flame structure forms in the period of the flame propagation velocity decreasing greatly and it can form only while the maximum deceleration is larger than a certain quantity; (4) the tulip-flame structure is a middle stage during the transformation of the premixed flame from the laminar combustion to the turbulent combustion. |
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| Keywords: | mechanics of explosion turbulent combustion high-speed schlieren photography premixed methane-air flame tulip flame |
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