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Comparison of Non-Uniform Methane-Air Explosion Characteristics in Confined Spaces with Different Structures.

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Title: Comparison of Non-Uniform Methane-Air Explosion Characteristics in Confined Spaces with Different Structures.
Authors: Guo, Jingjing1 (AUTHOR), Hao, Yongmei1 (AUTHOR) hymzsc@cczu.edu.cn, Mou, Lunzhuang1 (AUTHOR), Xing, Zhixiang1 (AUTHOR), Xu, Ning2 (AUTHOR), Fan, Wu1 (AUTHOR)
Source: Combustion Science & Technology. 2026, Vol. 198 Issue 8, p1965-1988. 24p.
Subject Terms: *Concentration gradient, *Gas explosions, *Explosions, *Pipeline failures, *Dynamic pressure, *Gas mixtures, *Confined spaces (Work environment), *Underground construction
Abstract: Buried pipeline leakage of inflammable and explosive medium into the closed space of an underground canal is easy to cause explosion accidents. In order to explore the explosion characteristics of non-uniform mixed gas leakage in different underground closed space structures, the underground closed space is simplified into U-shaped, L-shaped, and straight pipe structures through experiments and simulations, and the concentration gradient evolution and explosion characteristics of non-uniform methane-air mixed gas leakage in the early stage are compared.The results show that the non-uniform mixed gas diffuses in a confined space to form a certain concentration gradient. The concentration gradient range in the straight-tube confined space is the largest, reaching 0.379 mol/L. The flame structure in the curved closed space is obviously different from that in the straight pipe structure. The maximum overpressure in the curved structure shows an upward trend with the diffusion time. The maximum overpressure in the L-type is the highest, followed by the U-type, and the maximum overpressure in the straight pipe type is small, only 47.532 kPa. Finally, according to the above characteristics, the quantitative relationship between concentration gradient and explosion overpressure in a larger confined space is derived. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 193490000
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Comparison of Non-Uniform Methane-Air Explosion Characteristics in Confined Spaces with Different Structures.
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  Data: <searchLink fieldCode="AR" term="%22Guo%2C+Jingjing%22">Guo, Jingjing</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hao%2C+Yongmei%22">Hao, Yongmei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hymzsc@cczu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Mou%2C+Lunzhuang%22">Mou, Lunzhuang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xing%2C+Zhixiang%22">Xing, Zhixiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xu%2C+Ning%22">Xu, Ning</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fan%2C+Wu%22">Fan, Wu</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Combustion+Science+%26+Technology%22">Combustion Science & Technology</searchLink>. 2026, Vol. 198 Issue 8, p1965-1988. 24p.
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  Data: *<searchLink fieldCode="DE" term="%22Concentration+gradient%22">Concentration gradient</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas+explosions%22">Gas explosions</searchLink><br />*<searchLink fieldCode="DE" term="%22Explosions%22">Explosions</searchLink><br />*<searchLink fieldCode="DE" term="%22Pipeline+failures%22">Pipeline failures</searchLink><br />*<searchLink fieldCode="DE" term="%22Dynamic+pressure%22">Dynamic pressure</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas+mixtures%22">Gas mixtures</searchLink><br />*<searchLink fieldCode="DE" term="%22Confined+spaces+%28Work+environment%29%22">Confined spaces (Work environment)</searchLink><br />*<searchLink fieldCode="DE" term="%22Underground+construction%22">Underground construction</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Buried pipeline leakage of inflammable and explosive medium into the closed space of an underground canal is easy to cause explosion accidents. In order to explore the explosion characteristics of non-uniform mixed gas leakage in different underground closed space structures, the underground closed space is simplified into U-shaped, L-shaped, and straight pipe structures through experiments and simulations, and the concentration gradient evolution and explosion characteristics of non-uniform methane-air mixed gas leakage in the early stage are compared.The results show that the non-uniform mixed gas diffuses in a confined space to form a certain concentration gradient. The concentration gradient range in the straight-tube confined space is the largest, reaching 0.379 mol/L. The flame structure in the curved closed space is obviously different from that in the straight pipe structure. The maximum overpressure in the curved structure shows an upward trend with the diffusion time. The maximum overpressure in the L-type is the highest, followed by the U-type, and the maximum overpressure in the straight pipe type is small, only 47.532 kPa. Finally, according to the above characteristics, the quantitative relationship between concentration gradient and explosion overpressure in a larger confined space is derived. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=193490000
RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1080/00102202.2025.2497067
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 24
        StartPage: 1965
    Subjects:
      – SubjectFull: Concentration gradient
        Type: general
      – SubjectFull: Gas explosions
        Type: general
      – SubjectFull: Explosions
        Type: general
      – SubjectFull: Pipeline failures
        Type: general
      – SubjectFull: Dynamic pressure
        Type: general
      – SubjectFull: Gas mixtures
        Type: general
      – SubjectFull: Confined spaces (Work environment)
        Type: general
      – SubjectFull: Underground construction
        Type: general
    Titles:
      – TitleFull: Comparison of Non-Uniform Methane-Air Explosion Characteristics in Confined Spaces with Different Structures.
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            NameFull: Guo, Jingjing
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            NameFull: Hao, Yongmei
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            NameFull: Mou, Lunzhuang
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            NameFull: Xing, Zhixiang
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            NameFull: Xu, Ning
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            – D: 15
              M: 05
              Text: 2026
              Type: published
              Y: 2026
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              Value: 198
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              Value: 8
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            – TitleFull: Combustion Science & Technology
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