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Explosion experiments were conducted in a self-built stainless steel flame acceleration tube to investigate the impact of hydrogen blending ratios on the explosion behavior of methane-air mixtures. Tests were performed at hydrogen blending levels of 0, 10%, 20%, and 30%, along with equivalence ratios of 0.9, 1.0, and 1.1. Utilizing experimental equipment such as a high-speed camera, a PCB piezoelectric pressure sensor, and a photoelectric sensor, this research examined the flame development process, explosion overpressure, and average flame propagation speed within the tube. The results indicate that hydrogen enrichment enhances the flame luminosity of the methane-air mixture as observed through the observation window. Under fuel-rich conditions(Φ=1.1), hydrogen reacts preferentially with air, resulting in incomplete combustion of methane and the formation of a yellow flame. Three characteristic pressure peaks(p1, p2, p3) were identified in the pressure-time curves for all test conditions. These peaks correspond to the following events: the rupture of the vent membrane, the discharge of the burning mixture from the tube, and a secondary external explosion. The high reactivity of hydrogen enhances the peak values of p1, p2, and p3, as well as increases the flame propagation speed. Notably, the amplitude of p1 leads to two types of failures in the Polyethylene(PE) vent membrane: partial rupture and complete rupture. Complete membrane rupture allows a significant amount of unburned mixture to escape from the tube, which intensifies the external explosion while leading to a noticeable decrease in p2 and a reduction in flame propagation speed. In contrast, when the membrane is only partially ruptured, a substantial amount of unburned mixture accumulates inside the tube, resulting in a more intense reaction within the tube. The experimental data provide a foundation for the prevention and control of accidental explosions involving hydrogen-methane-air premixed gases in enclosed tubes. Additionally, this research serves as a methodological reference for studies on the explosion characteristics of other combustible gases.
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Basic Information:
DOI：10.13637/j.issn.1009-6094.2025.1438
China Classification Code:X932
Citation Information:
[1]Li Xuejiao,Feng Dingyu,Wang Quan ,et al.Study on the influence of hydrogen blending on the ignition and explosion characteristics of methane-air tubes with different equivalence ratios[J].Journal of Safety and Environment,2026,26(08):2978-2986.DOI:10.13637/j.issn.1009-6094.2025.1438.
Fund Information:
安徽省重点研究与开发计划社会领域项目(2023g07020002); 安徽省自然科学基金项目(2408085MA006)
2026-03-18
2026-03-18
2026-03-18