• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
空腔长宽比对瓦斯爆炸冲击波传播规律的影响
  • Title

    Influence of cavity aspect ratio on the propagation law of gas explosion shock wave

  • 作者

    严灼穆朝民袁树杰李重情齐娟

  • Author

    YAN Zhuo1,2,3 ,MU Chaomin2,3 ,YUAN Shujie2,3 ,LI Zhongqing1,2,3 ,QI Juan3

  • 单位

    安徽理工大学 能源与安全学院安徽理工大学 煤矿安全高效开采省部共建教育部重点实验室安徽理工大学 电气与信息工程学院

  • Organization
    1. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines,Anhui University of Science and Technology,Huainan 232001,China; 2. Key Laboratory of Safety and High-efficiency Coal Mining,Ministry of Education,Anhui University of Science and Technology,Huainan 232001,China; 3. School of Energy and Safety,Anhui University of Science and Technology,Huainan  232001,China
  • 摘要

    近年国内外学者对瓦斯爆炸抑爆隔爆技术的研究主要围绕抑爆剂、吸能材料和空腔等开展。文献指出空腔具有抑制瓦斯爆炸传播的功能,且抑爆性能受空腔体积大小影响。

    为探索体积不变条件下空腔尺寸特征对瓦斯爆炸传播抑制性能的影响,设计了体积为0.08 m3长宽比分别为5/8,8/5的矩形钢质空腔,壁厚10 mm,并将其铺设在36 m长的大型瓦斯爆炸管道系统中开展实验研究,考察瓦斯爆炸火焰和冲击波超压经过空腔后的变化规律。

    结果表明:长宽比5/8空腔对爆炸火焰、冲击波传播均有抑制作用,长宽比8/5空腔对爆炸火焰有抑制作用,但对冲击波传播有增强作用。在此基础上建立数值模型,将体积为0.08 m3长宽比分别为1/10,2/5,5/8,1,8/5,5/2的空腔铺设在管道系统中开展数值模拟研究,研究发现:空腔对瓦斯爆炸冲击波传播抑制作用取决于空腔长宽比,长宽比越小,空腔对冲击波传播抑制作用越强;且存在临界长宽比,当长宽比小于1时,空腔对冲击波超压传播具有抑制作用,当长宽比大于1时,空腔对冲击波传播具有增强作用,长宽比为5/2时,增强现象最明显。

    最后,分析了空腔长宽比影响瓦斯爆炸冲击波传播规律作用机理,空腔长宽比越大,在出口和入口能接收到的反射波就越多,反射波在出口和入口叠加后产生的冲击波超压也就越大,反之越小;空腔长宽比越大,在空腔内参与爆炸的预混气体越多,腔内爆炸越剧烈,产生的增量冲击波就越强,反之越弱;因此,长宽比越大,空腔对瓦斯爆炸冲击波传播抑制作用越差,反之抑制作用越好,当长宽比大于临界长宽比时,空腔会增强瓦斯爆炸冲击波传播。

  • Abstract
    In recent years,the researches on gas explosion suppression and explosion-proof technology worldwide main- ly focus on explosion suppression agent,energy-absorbing material and vacuum cavity. It is pointed out in the litera- tures that the cavity has the function of explosion suppression,and the effect of explosion suppression depends on the volume of the cavity. In order to explore the influence of cavity size characteristics on the suppression performance of gas explosion propagation,rectangular steel cavities with a wall thickness of 10 mm and a volume of 0. 08 m3 and an aspect ratio of 5 / 8 and 8 / 5 were designed respectively. The cavities were installed respectively in a large pipeline sys- tem with a length of 36 meters for carrying out experimental research,and investigating the variation of gas explosion flame and shock wave overpressure after passing through the cavities. The results showed that the cavity with an aspect ratio of 5 / 8 inhibits the propagation of explosion flame and shock wave. The cavity with an aspect ratio 8 / 5 inhibits the explosion flame,but enhances the propagation of shock wave. On this basis,a numerical model was established,and the cavities with a volume of 0. 08 m3 and the aspect ratios of 1 / 10,2 / 5,5 / 8,1,8 / 5 and 5 / 2 were attached respectively to the pipeline system for carrying out numerical simulation. It is found that the inhibition effect of cavities on the propa- gation of gas explosion shock wave depends on the aspect ratio of the cavities. The smaller the aspect ratio is,the stron- ger the inhibition effect of cavities on the propagation of shock wave,and there is a critical aspect ratio. When the as- pect ratio is less than 1,the cavity inhibits the shock wave propagation. When the aspect ratio is greater than 1,the cavity enhances the shock wave propagation. When the aspect ratio is 5 / 2, the enhancement is most obvious. The mechanism of the influence of cavity aspect ratio on the propagation of gas explosion shock wave was analyzed. The greater the aspect ratio of cavity is,the more the reflected wave can be received at the outlet and the inlet,and the greater the overpressure of shock wave generated by the superimposed reflected wave at the outlet and the inlet,and vice versa. The greater the aspect ratio of the cavity is,the more premixed gas is involved in the explosion in the cavi- ty,the more intensive the explosion in the cavity is,and vice versa. Therefore,the greater the aspect ratio is,the worse the inhibition effect of cavity on the propagation of gas explosion shock wave is,and otherwise the better the inhibition effect is. When the aspect ratio is greater than the critical aspect ratio,the cavity will enhance the propagation of gas explosion shock wave.
  • 关键词

    瓦斯爆炸爆炸防治空腔抑爆熄火消波

  • KeyWords

    gas explosion;explosion control;explosion suppression with cavity;flame out;wave attenuation

  • 基金项目(Foundation)
    国家自然科学基金资助项目(51874009);安徽省高校自然科学研究资助项目(KJ2017A092)
  • DOI
  • Citation
    YAN Zhuo,MU Chaomin,YUAN Shujie,et al. Influence of cavity aspect ratio on the propagation law of gas explosion shock wave[J]. Journal of China Coal Society,2020,45(5):1803-1811.
  • 图表
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