| 煤气火焰传播规律及其加速机理研究 |
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| 引用本文： | 卢捷,宁建国,王成,林柏泉.煤气火焰传播规律及其加速机理研究[J].爆炸与冲击,2004,24(4):305-311. |
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| 作者姓名： | 卢捷 宁建国 王成 林柏泉 |
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| 作者单位： | 1. 北京理工大学爆炸灾害预防、控制国家重点实验室,北京,100081
2. 中国矿业大学能源与科学工程学院,江苏,徐州,221008 |
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| 基金项目： | 国家自然科学基金
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中国博士后科学基金 |
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| 摘 要： | 研究了煤气/空气预混气在两端封闭管道中的火焰传播加速现象和管道中有无障碍物时火焰的加速机理,认为火焰加速是由于火焰前未燃气体被前驱压缩波加热和障碍物诱导的湍流区对燃烧过程的正反馈造成的。实验结果表明,障碍物存在时,最大爆炸压力可提高20%,与理论计算一致;火焰传播特性随煤气浓度的变化而改变;障碍物阻塞比对火焰的速度和压力都有一定影响。
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| 关 键 词： | 爆炸力学 火焰加速 阻塞比 煤气 障碍物 煤气浓度 火焰加速 传播规律 机理研究 coal gas city acceleration mechanism flame propagation 影响 最大爆炸压力 速度 障碍物阻塞比 变化 传播特性 理论计算 存在 结果 实验 正反馈 燃烧过程 |
| 文章编号： | 1001-1455(2004)04-0305-07 |
| 修稿时间： | 2003年7月22日 |
Study on flame propagation and acceleration mechanism of city coal gas |
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| LU Jie,NING Jian-guo,WANG Cheng,LIN Bai-quan Disaster,Beijing Institute of Technology,Beijing ,China,.College of Energy Science and Engineering,China Universityof Mining and Technology,Xuzhou ,Jiangsu,China.Study on flame propagation and acceleration mechanism of city coal gas[J].Explosion and Shock Waves,2004,24(4):305-311. |
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| Authors: | LU Jie NING Jian-guo WANG Cheng LIN Bai-quan Disaster Beijing Institute of Technology Beijing China College of Energy Science and Engineering China Universityof Mining and Technology Xuzhou Jiangsu China |
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| Affiliation: | LU Jie~1,NING Jian-guo~1,WANG Cheng~1,LIN Bai-quan~2 Disaster,Beijing Institute of Technology,Beijing 100081,China,2.College of Energy Science and Engineering,China Universityof Mining and Technology,Xuzhou 221008,Jiangsu,China) |
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| Abstract: | An experimental study on acceleration mechanism of flame propagation of city coal gas-air mixture was conducted in a closed obstructed duct with 80mm diameter and 21mm length, and acceleration mechanism of flame with or without obstructions is researched. Acceleration mechanism of flame propagation owes mainly to the positive feedback of unburned gas heated and compressed by the leading compression wave and the turbulence region induced by obstacles for combustion process. The experiment results indicates that maximum explosion pressure can increase by 20% when obstacles are present, the maximum explosion pressure of theoretical computation results accord with the experiment one well. Flame propagation Characteristics with the variation of equivalence ration of city coal gas-air mixtures is compared. Circular plates number and blockage ratio have some effects on the flame velocity and the overpressure. The experiment and calculation results are useful in providing some guidance for industrial application. |
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| Keywords: | mechanics of explosion flame acceleration blockage ratio city coal gas obstructions |
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