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氢/空气火焰在半开口有障碍管道中的传播特性
Flame Propagation of H_2-Air in a Semi-Open Obstructed Tube
查看参考文献9篇
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文摘
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针对氢/空气混合物，通过实验研究了其预混火焰在半开口管道中的火焰传播加速现象。结果表明，火焰传播状态随着氢气当量比的变化而发生改变。当氢/空气混合物被点燃后，由于障碍物的扰动，火焰在管道中不断加速传播，并最终到一准稳态传播。在氢气当量比0.34附近时，火焰速度发生跃变。当氢气当量比足够大时，火焰传播由爆燃态转变为爆轰态。在本实验条件下，爆燃转准爆轰的临界条件是d/λ ≥ 2.6（d是圆环形障碍物内径，λ是爆轰格胞尺度）。障碍物阻塞比的变化对最大火焰速度和压力提升的影响不明显。 |
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其他语种文摘
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The turbulent flame acceleration experiments with H_2-air mixture have been carried out in a semi-open obstructed tube with an 80 mm diameter and 2.5 m length. Circular orifice plates spaced 200 mm apart with blockage ratios of BR = 0.315, 0.438 and 0.609 were used as flow obstructions. The results indicate that there exist clear transitions in the regime of flame propagation with the variation of equivalence ratio of hydrogen-air mixtures. When the H_2-air mixture is ignited, the flame accelerates and eventualy reaches a quasi-steady state due to obstructions. A sharp transition occurs at an equivalence ratio about 0.34. The second transition from deflagration to detonation occurs if the equivalence ratio is sufficiently high. In the present study, for the semi-open tube, one criterion of transition to detonation is that the ratio of orifice diameter d to detonation cell size λ is d/λ ≥ 2.6. The magnitude of the maximum flame speed and the overpressure is insensitive to the blockage ratios. |
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来源
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燃烧科学与技术
,2002,8(1):27-30 【扩展库】
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关键词
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氢/空气混合物
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半开口管道
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火焰传播
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阻塞比
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压力提升
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地址
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中国科学院力学研究所, 北京, 100080
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1006-8740 |
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学科
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力学 |
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基金
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国家973计划
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文献收藏号
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CSCD:1015370
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参考文献 共
9
共1页
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