Inerting effect of carbon dioxide on confined hydrogen explosion

Li, Yanchao; Bi, Mingshu; Yan, Caicai; Liu, Qixuan; Zhou, Yonghao; Gao, Wei

doi:10.1016/j.ijhydene.2019.04.181

Cited by 56 publications

(5 citation statements)

References 32 publications

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“…Furthermore, it can be observed that the fold at the leading edge of the explosion flame changes significantly after the addition of CO 2 . Studies of the effect of CO 2 on hydrogen explosions by Li 42 have shown that under hydrogen-rich conditions, the number of cracks in the flame remains constant and the flame surface is smooth. There are two usual reasons for the appearance of folds on the flame front: one is the influence of the ignition electrode, but the ignition electrode only has an effect when the radius is small; The second is caused by the instability of the constant expansion flame, specifically due to the pressure gradient on the flame front and the oblique pressure torque generated by the action of the density gradient on the vertical flame surface.…”

Section: Results and Analysismentioning

confidence: 99%

“…Wei et al 40 and Zhang et al 41 studied the effect of N 2 and CO 2 on the suppression of hydrogen flame properties in fixed-volume incendiary bombs and closed channels, respectively, and noted that CO 2 is a superior flame propagation suppressor than Ar and N 2 . Li et al 42 concluded that the thermal diffusion instability of hydrogen-air explosions increases and hydrodynamic instability decreases as the number of CO 2 increases. Yang et al 43 studied the effects of He, Ar, and N 2 on the flame speed of hydrogen mixtures by varying the ignition location.…”

Section: Introductionmentioning

confidence: 99%

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Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

Luo,

Qi,

et al. 2023

ACS Omega

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The explosion characteristics of premixed gases under different equivalence ratios (1.0–3.0) and inert gas addition (5–20%) are experimentally investigated, and sensitivity analysis of the radical reactions is carried out using the USC Mech II model to analyze the molar fraction of radicals. The results show that at high equivalence ratios, inert gas has little effect on flame stability. The addition of an inert gas reduces the tensile rate in the early stage of flame growth. At high equivalence ratios, CO 2 inhibits explosive flame propagation twice as effectively as N 2 . Due to the large heat capacity and chemical kinetic effects, CO 2 has a stronger inhibitory effect on the explosion pressure than N 2 , and the inhibition efficiency on the explosion strength is nearly twice that high. To further analyze the effect of different inert gas addition ratios on chemical kinetics, sensitivity analysis, and molar fraction simulations were performed. The thermal and chemical kinetic effects of CO 2 cause later generation of H and OH radicals and the partial chain reaction involving CO 2 causes a lower peak of H radicals than the peak of H radicals generated under an N 2 atmosphere. However, CO 2 is a direct reactant and the third body to produce a small chemical kinetic effect.

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

Luo,

Qi,

et al. 2023

ACS Omega

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“…Thermal diffusivity is an important parameter to describe the heat transport in materials [47]. The decrease of thermal diffusivity would lead to the inhibition of flame propagation [48]. Figure 7 shows the thermal diffusivity versus inhibitor content with different hydrogen addition.…”

Section: Thermal Diffusivitymentioning

confidence: 99%

The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition

Zhang

Shen

Wen

et al. 2020

Fuel

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“…To mitigate the influence of hydrogen explosion, the addition of inert gas is well-known to be one of possible approaches. We have several reports which experimentally studied the effects of inert-gas addition on the combustion characteristics of hydrogen premixtures (Qiao et al, 2007;Bane et al, 2011;Zhang et al, 2012;Cheikhravat et al, 2015;Duan and Liu, 2017;Li et al, 2018;Li et al, 2019;Yan et al, 2020;Gong et al, 2020;Katsumi et al, 2021;Morovatiyan, et al, 2021). The addition of inert gas has the effects of decreasing the burning velocity and reducing the maximum pressure in explosion.…”

Section: Introductionmentioning

confidence: 99%

Effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames

KATSUMI,

KUMADA,

NOGUCHI

et al. 2023

JTST

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To investigate the effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames, the experiments of premixed combustion were performed in a closed chamber. The dynamic behavior of premixed flames was caught by high-speed Schlieren imaging, and the flame radius and propagation velocity were measured by analyzing the Schlieren photography. When the flame radius was sufficiently small, smooth flame surface was observed, where the flame stretch affected strongly the propagation velocity. From the correlation between the propagation velocity and flame stretch rate, we estimated the propagation velocity of unstretched flame and the Markstein length including thermal-expansion effects. When the flame radius was large, on the other hand, cellular surface induced by intrinsic instability was observed, and then the flame acceleration was confirmed. As the results, the critical flame radius corresponding to the occurrence of flame acceleration and the increment coefficient of propagation velocity were obtained. It was found that the increment coefficient became larger at low equivalence ratios, which was because the diffusivethermal instability became stronger. Under the conditions of high concentration of inert gas, the increment coefficient of propagation velocity became smaller. This was because the burning velocity became lower by increasing the inert-gas concentration. Moreover, we obtained the increment coefficient normalized by the propagation velocity of unstretched flame. The normalized increment coefficient increased as the inert-gas concentration became higher, which indicated that the addition of inert gas promoted the instability of hydrogen flames. Based on the dynamic behavior and propagation characteristics of premixed flames, the parameters of flame acceleration model depending on the inert-gas concentration were obtained, and then the flame propagation velocity was predicted.

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Inerting effect of carbon dioxide on confined hydrogen explosion

Cited by 56 publications

References 32 publications

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition

Effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames

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Inerting effect of carbon dioxide on confined hydrogen explosion

Cited by 56 publications

References 32 publications

Effect of N2 and CO2 on the Explosion Properties of High Equivalence Ratios of Hydrogen

Effect of N2 and CO2 on the Explosion Properties of High Equivalence Ratios of Hydrogen

The behavior of methane/hydrogen/air premixed flame in a closed channel with inhibition

Effects of inert-gas addition on the dynamic behavior and propagation characteristics of spherically expanding hydrogen-air flames

Contact Info

Product

Resources

About

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen

Effect of N₂ and CO₂ on the Explosion Properties of High Equivalence Ratios of Hydrogen