The explosion venting characteristics of hydrogen/methane/air mixtures under the congestion of obstacles

IF 4.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Acta Mechanica Sinica Pub Date : 2025-08-27 DOI:10.1007/s10409-025-24775-x

Xianzhao Song (, ), Shuxin Deng (, ), Hao Lu (, ), Jing Zhang (, ), Bin Li (, ), Lifeng Xie (, ), Yong He (, ), Mingyang Wang (, )

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Abstract

To investigate the characteristics of vented explosions in stoichiometric hydrogen/methane/air mixtures in the presence of obstacles, experiments were conducted within a cylindrical duct, taking into account the effects of hydrogen concentration, blockage ratio (BR), and the number of obstacles. The results indicate that internal and external peak overpressures generally increase with a higher hydrogen fraction. A higher propensity for transitioning from deflagration to detonation is observed under conditions of elevated hydrogen concentration and higher BRs. The rupture shock overpressure increases with the hydrogen fraction, peaking with five obstacles, and then decreases as the BR further increases. This pattern is also observed in the overpressure of external explosions and the maximum temperature of external flames. Given the impact of blast overpressure on human safety and structural integrity, the minimum safe distance required for equipment is notably greater than that for personnel. These results contribute to the safe and efficient use of hydrogen/methane blended gases.

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障碍物堵塞条件下氢/甲烷/空气混合物的爆炸排气特性

为了研究化学计量氢气/甲烷/空气混合物中存在障碍物时的排气爆炸特性，在考虑氢气浓度、堵塞比（BR）和障碍物数量影响的圆柱形管道内进行了实验。结果表明，随着氢馏分的增加，内部和外部峰值超压普遍增大。在氢浓度升高和比燃比增大的条件下，从爆燃过渡到爆轰的倾向较高。破裂冲击超压随氢气含量的增加而增加，在5个障碍物处达到峰值，然后随着BR的进一步增加而降低。这种模式也可以在外部爆炸的超压和外部火焰的最高温度中观察到。考虑到爆炸超压对人身安全和结构完整性的影响，设备所需的最小安全距离明显大于人员所需的最小安全距离。这些结果有助于安全有效地利用氢/甲烷混合气体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Mechanica Sinica 物理-工程：机械

CiteScore

5.60

自引率

20.00%

发文量

1807

审稿时长

4 months

期刊介绍： Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics