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首页> 外文期刊>RSC Advances >Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO2 and ultrafine water mist
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Synergistic inhibition effect on the self-acceleration characteristics in the initial stage of methane/air explosion by CO2 and ultrafine water mist

机译：二氧化碳和超细水雾对甲烷/空气爆炸初期自加速特性的协同抑制作用

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摘要

Cellular instability is responsible for the self-acceleration of a flame, and such acceleration might cause considerable damage. This paper presents an experimental study on the inhibition effect of CO2 and an ultrafine water mist on the self-acceleration characteristics of a spherical flame in the initial stage of a 9.5% methane/air explosion in a constant volume combustion bomb. Results showed that insufficient water mist enhanced the self-acceleration of the spherical flame and the intensity of the explosion; nevertheless, the synergistic inhibition effect of CO2 and ultrafine water mist prevented enhancement of the explosion and significantly mitigated the self-acceleration of spherical flames, which observably delayed the appearance time of a cellular flame, and reduced the flame propagation speed, overpressure and the mean rate of pressure rise, indicating that suppression of flame self-acceleration could effectively mitigate the damage from a methane/air explosion. The reason for the synergistic effect was a result of a combination of physical suppression and chemical suppression: due to the preferential diffusion dilution effect of CO2, the initial flame speed was reduced, and the flame became thicker, which increased the evaporation time and quantity of droplets around the flame front, accordingly enhancing the cooling effect on the flame front. The increased flame thickness could withstand greater disturbance and inhibit the formation and development of a cellular flame. Meanwhile, CO2 and H2O can also reduce the concentration of active radicals (O, H and OH) and reduce the reaction rate and combustion rate of a methane/air explosion.
机译：蜂窝不稳定性负责火焰的自加速，并且这种加速度可能导致相当大的损坏。本文介绍了CO2和超细水雾对恒定体积燃烧炸弹中9.5％甲烷/空气爆炸的初始阶段的球形火焰自加速特性的实验研究。结果表明，水雾不足增强了球形火焰的自我加速和爆炸的强度;尽管如此，CO2和超细水雾的协同抑制作用阻止了爆炸的增强，并显着减轻了球形火焰的自加速，可观察地延迟了蜂窝火焰的外观时间，降低了火焰传播速度，超压和平均值压力升高，表明抑制火焰自加速度可以有效地减轻甲烷/空气爆炸的损伤。协同效应的原因是物理抑制和化学抑制的组合的结果：由于CO2的优先扩散稀释效果，初始火焰速度降低，并且火焰变厚，增加了蒸发时间和量在火焰前面的液滴，因此提高了火焰前面的冷却效果。增加的火焰厚度可以承受更大的扰动并抑制细胞火焰的形成和发展。同时，CO 2和H 2 O还可以降低活性自由基（O，H和OH）的浓度，并降低甲烷/空气爆炸的反应速率和燃烧速率。

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  • 来源
    《RSC Advances》 |2019年第24期|共9页
  • 作者

    Pei Bei; Wei Shuangming; Chen Liwei; Pan Rongkun; Yu Minggao; Jing Guoxun;

  • 作者单位

    Henan Polytech Univ Collaborat Innovat Ctr Coal Safety Prod Henan Pro Jiaozuo 454003 Henan Peoples R China;

    Henan Polytech Univ Collaborat Innovat Ctr Coal Safety Prod Henan Pro Jiaozuo 454003 Henan Peoples R China;

    Henan Polytech Univ Collaborat Innovat Ctr Coal Safety Prod Henan Pro Jiaozuo 454003 Henan Peoples R China;

    Henan Polytech Univ Collaborat Innovat Ctr Coal Safety Prod Henan Pro Jiaozuo 454003 Henan Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam &

    Control Chongqing 400044 Peoples R China;

    Henan Polytech Univ Collaborat Innovat Ctr Coal Safety Prod Henan Pro Jiaozuo 454003 Henan Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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