Explosion mechanism of aluminum powder mixed with low-concentration hydrogen

Cheng, Yu-Chi; Zhao, Jue-Quan; Liao, Sheng-Wei; Shu, Chi‐Min

doi:10.1016/j.ijhydene.2022.06.034

Cited by 9 publications

(1 citation statement)

References 30 publications

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“…This study’s maximum (d P /d t ) collected at each measuring point in a single experiment is the (d P /d t ) max . The (d P /d t ) max is an essential parameter for measuring the danger of an explosion process and evaluating a container’s pressure and pressure relief design in addition to pressure Figure shows the relationship curve between (d P /d t ) max and equivalence ratios (Φ) and hydrogen blending ratios (λ).…”

Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures

Liu,

Peng

et al. 2024

ACS Omega

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To evaluate the explosion hazard of CH4/H2 mixtures, experiments were conducted in a long and closed pipeline with a length-to-diameter ratio of 51 and built-in obstacles, and the characteristic parameters of deflagration shock waves were analyzed under different hydrogen blending ratios (0 ≤ λ ≤ 100%) and equivalence ratios (0.5 ≤ Φ ≤ 3). The results indicate that within the range of Φ = 0.8–1.2, the explosion overpressure (P P) exhibits a “two-zone” structure distribution. When 0 ≤ λ ≤ 80%, P P shows an initial increase and then a decrease in both regions, while deflagration to detonation transition (DDT) occurs in the second evolution region when λ = 100%, which is caused by the different strengths of the positive feedback mechanism coupled with flames and shock waves. The P max, (dP/dt)max, and V a show a trend of first increasing and then decreasing and monotonically increasing with the increase of the equivalence ratio and hydrogen blending ratio, respectively, and reach their maximum values at Φ = 1.0 and λ = 100%. For CH4/H2 mixtures with low hydrogen blending ratios (λ = 0 and 20%), the P max and (dP/dt)max in the fuel-lean conditions (Φ = 0.9 and 0.8) are higher than those in the fuel-rich conditions (Φ = 1.1 and 1.2), while the CH4/H2 mixtures under high hydrogen blending ratios (λ = 80 and 100%) are the opposite. Overall, the increase in H2 at a high hydrogen blending ratio and the increase in the equivalence ratio at a fuel-lean condition significantly enhance the average V a. In addition, chemical kinetics analysis found that R38 and R52 elementary reactions are the dominant elementary reactions that promote and inhibit temperature increase, respectively. Their temperature sensitivity coefficients are negatively correlated with the hydrogen blending ratio and positively correlated with the equivalence ratio. The research results provide vital information for evaluating the explosion hazards of CH4/H2 mixtures and developing safety protection measures.

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Section: Resultsmentioning

confidence: 99%

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures

Liu,

Peng

et al. 2024

ACS Omega

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Flow process and energy release of hydrogen in fluorine

Zhang

2023

International Journal of Hydrogen Energy

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Influence of equivalence ratio and H2 blended ratio on explosion propagation characteristics of DME/H2 blended gas in closed narrow space

Zhou

Kong

et al. 2023

International Journal of Hydrogen Energy

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Explosion mechanism of aluminum powder mixed with low-concentration hydrogen

Cited by 9 publications

References 30 publications

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures

Flow process and energy release of hydrogen in fluorine

Influence of equivalence ratio and H2 blended ratio on explosion propagation characteristics of DME/H2 blended gas in closed narrow space

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Explosion mechanism of aluminum powder mixed with low-concentration hydrogen

Cited by 9 publications

References 30 publications

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH4/H2 Mixtures

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH4/H2 Mixtures

Flow process and energy release of hydrogen in fluorine

Influence of equivalence ratio and H2 blended ratio on explosion propagation characteristics of DME/H2 blended gas in closed narrow space

Contact Info

Product

Resources

About

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures

Effects of Hydrogen Blending Ratio and Equivalence Ratio on the Dynamic Characteristics of Deflagration Shock Waves of CH₄/H₂ Mixtures