| 半开口管道中的氢/空气火焰加速和压力发展过程 |
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| 引用本文： | 余立新,孙文超,吴承康.半开口管道中的氢/空气火焰加速和压力发展过程[J].工程热物理学报,2001,22(5):637-640. |
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| 作者姓名： | 余立新 孙文超 吴承康 |
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| 作者单位： | 中国科学院力学研究所 |
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| 基金项目： | 国家重点基础研究发展规划基金资助项目（No．G1999022305） |
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| 摘 要： | 本文研究了氢／空气预混火焰在半开口管道中的火焰加速现象和压力发展过程．结果表明，重复布置的障碍物对火焰速度和压力提升产生显著的影响．火焰传播状态随着氢气当量比的变化而发生改变，在氢气当量比约为０．３４时，火焰速度出现第一次跃变；随着氢气当量比进一步提高，火焰速度发生第二次跃变，即由爆燃转为爆轰．发生爆轰时氢气当量比的范围随着阻塞比的不同而发生变化．
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| 关 键 词： | 氢/空气混合物 当量比 障碍物阻塞比 火焰加速 压力提升 |
| 文章编号： | 0253-231(2001)05-0637-04 |
| 修稿时间： | 2001年1月4日 |
FLAME ACCELERATION AND PRESSURE DEVELOPMENT OF H2-AIR IN A SEMI-OPEN TUBE |
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| YU Li-Xin SUN Wen-Chao WU Cheng-Kang.FLAME ACCELERATION AND PRESSURE DEVELOPMENT OF H2-AIR IN A SEMI-OPEN TUBE[J].Journal of Engineering Thermophysics,2001,22(5):637-640. |
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| Authors: | YU Li-Xin SUN Wen-Chao WU Cheng-Kang |
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| Abstract: | An investigation on flame acceleration and pressure development in H2-air mixtures has been carried out in a semi-open obstructed tube. The results indicate that repeated obstacles have a dramatic influence on the flame speed and overpressure, and there exist clear transitions in the regime of flame propagation with variation of equivalence ratio of hydrogen-air mixtures due to obstructions. The first transition of flame speed appears at about equivalence ratio of 0.34. The second transition from deflagration to detonation is observed with the increment of equivalence ratio. The range of equivalence ratio depends on variation of blockage ratio when transition to detonation occurs. |
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| Keywords: | H_2-air mixtures equivalence ratio blockage ratio flame acceleration overpressure |
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