View in EDS

Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions.

Saved in:
Bibliographic Details
Title: Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions.
Authors: Han, Xinlu1 (AUTHOR), Lin, Fawei1,2 (AUTHOR) linfawei@tju.edu.cn, Konnov, Alexander A.3 (AUTHOR)
Source: Combustion & Flame. Jan2026, Vol. 283, pN.PAG-N.PAG. 1p.
Subjects: Methane, Burning velocity, Data analysis, Combustion kinetics, Atmospheric oxygen, Empirical research, Air-fuel ratio
Abstract: The laminar burning velocity (S L) of methane (CH 4), the primary constituent of natural gas, is a key combustion property essential for validating combustion kinetic models. The present study focuses on the CH 4 S L at the very rich side of flames, where the available experimental data are scarce with highly dispersed measurement conditions, and data projection was carried out to overcome the difficulty in making direct data comparison and subsequent kinetic model validation. To validate the projection method, new measurements were performed across various equivalence ratios (1.6 - 2.3), unburnt temperatures (298 K - 448 K), and oxygen ratios in the O 2 +N 2 oxidizer (0.30 - 0.38), with many conditions not explored in existing literature. Six widely-used kinetic models were adopted for simulations, together with reaction sensitivity analyses, which revealed consistent reactions governing the S L dependences on the unburnt temperatures and oxygen ratios. Similar flame conditions with nearly identical A-factor S L sensitivity values were also identified, with a parameter ζ A − B introduced to describe the S L ratio between conditions A and B within a similar flame condition area. The very low reaction sensitivities of ζ A − B allow any model to accurately reflect ζ A − B regardless of its accuracy in predicting S L. Using the simulated ζ A − B , all available data at 1 atm were projected to conditions with unburnt temperature 377 K and various oxygen ratios, through which inconsistencies among different experimental datasets were revealed, indicating some of the measurements should have larger actual uncertainties than reported. Moreover, all six models significantly underestimate the S L for flames with an equivalence ratio of 1.5 and low oxygen ratios and overestimate the equivalence ratio 2.5 results, indicating room for further improvement of these models. Besides, the projection method proposed in the present study can potentially be applied to other types of flames, helping data comparison and kinetic model validation. [ABSTRACT FROM AUTHOR]
Copyright of Combustion & Flame is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 190203926
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Han%2C+Xinlu%22">Han, Xinlu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+Fawei%22">Lin, Fawei</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> linfawei@tju.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Konnov%2C+Alexander+A%2E%22">Konnov, Alexander A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Combustion+%26+Flame%22">Combustion & Flame</searchLink>. Jan2026, Vol. 283, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Burning+velocity%22">Burning velocity</searchLink><br /><searchLink fieldCode="DE" term="%22Data+analysis%22">Data analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Combustion+kinetics%22">Combustion kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+oxygen%22">Atmospheric oxygen</searchLink><br /><searchLink fieldCode="DE" term="%22Empirical+research%22">Empirical research</searchLink><br /><searchLink fieldCode="DE" term="%22Air-fuel+ratio%22">Air-fuel ratio</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The laminar burning velocity (S L) of methane (CH 4), the primary constituent of natural gas, is a key combustion property essential for validating combustion kinetic models. The present study focuses on the CH 4 S L at the very rich side of flames, where the available experimental data are scarce with highly dispersed measurement conditions, and data projection was carried out to overcome the difficulty in making direct data comparison and subsequent kinetic model validation. To validate the projection method, new measurements were performed across various equivalence ratios (1.6 - 2.3), unburnt temperatures (298 K - 448 K), and oxygen ratios in the O 2 +N 2 oxidizer (0.30 - 0.38), with many conditions not explored in existing literature. Six widely-used kinetic models were adopted for simulations, together with reaction sensitivity analyses, which revealed consistent reactions governing the S L dependences on the unburnt temperatures and oxygen ratios. Similar flame conditions with nearly identical A-factor S L sensitivity values were also identified, with a parameter ζ A − B introduced to describe the S L ratio between conditions A and B within a similar flame condition area. The very low reaction sensitivities of ζ A − B allow any model to accurately reflect ζ A − B regardless of its accuracy in predicting S L. Using the simulated ζ A − B , all available data at 1 atm were projected to conditions with unburnt temperature 377 K and various oxygen ratios, through which inconsistencies among different experimental datasets were revealed, indicating some of the measurements should have larger actual uncertainties than reported. Moreover, all six models significantly underestimate the S L for flames with an equivalence ratio of 1.5 and low oxygen ratios and overestimate the equivalence ratio 2.5 results, indicating room for further improvement of these models. Besides, the projection method proposed in the present study can potentially be applied to other types of flames, helping data comparison and kinetic model validation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Combustion & Flame is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=190203926
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.combustflame.2025.114617
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Methane
        Type: general
      – SubjectFull: Burning velocity
        Type: general
      – SubjectFull: Data analysis
        Type: general
      – SubjectFull: Combustion kinetics
        Type: general
      – SubjectFull: Atmospheric oxygen
        Type: general
      – SubjectFull: Empirical research
        Type: general
      – SubjectFull: Air-fuel ratio
        Type: general
    Titles:
      – TitleFull: Laminar burning velocities of rich CH4+N2+O2 flames: A projection to make direct data comparison for highly dispersed experimental conditions.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Han, Xinlu
      – PersonEntity:
          Name:
            NameFull: Lin, Fawei
      – PersonEntity:
          Name:
            NameFull: Konnov, Alexander A.
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00102180
          Numbering:
            – Type: volume
              Value: 283
          Titles:
            – TitleFull: Combustion & Flame
              Type: main
ResultId 1