Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames.
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| Title: | Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames. |
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| Authors: | Zhang, Feichi1 feichi.zhang@kit.edu, Baust, Tobias1, Zirwes, Thorsten1,2, Denev, Jordan1,2, Habisreuther, Peter1, Zarzalis, Nikolaos1, Bockhorn, Henning1 |
| Source: | Energy Technology. Jul2017, Vol. 5 Issue 7, p1055-1063. 9p. |
| Subject Terms: | *Combustion, *Energy conversion |
| Abstract: | Combustion is an important part of most current and future overall energy-conversion systems, especially if using renewable fuels in energy-storage concepts. Therefore, the laminar flame speed, which is a key parameter for the design of combustion systems, needs to be known for a growing multitude of different thermodynamic conditions and fuels. The spherically expanding flame method is one of the few techniques that enables the flame speed to be measured under particular conditions such as elevated pressure and temperature as well as under turbulent conditions, which are important for energy-conversion applications. The radius of a spherically propagating flame is tracked and used for evaluation of the flame speed. Usually, the flame is assumed to be infinitely thin. To assess the influence of this assumption, direct numerical simulations were conducted for the experimental setup and compared with measurements and correlations from the literature. The flame speed determined by the consumption rate of fuel, which takes a finite thickness of the flame into account, was found to be always larger than the flame speed computed by assuming an infinitely thin flame. The difference between these flame speeds was observed to be as large as approximately 10-20 % in the evaluation range of the measured flame radii, which decreases with growing flame radius. This gives rise to the discrepancies in the flame speeds obtained from different measurement methods. An analytical estimation for this difference was developed as a function of the flame radius, which showed quantitatively good agreement with the simulation results and may be used for experimental validations of the flame speed. Both premixed H2/air and CH4/air flames with equivalence ratios ranging from lean to rich conditions were studied. [ABSTRACT FROM AUTHOR] |
| Copyright of Energy Technology is the property of Wiley-Blackwell 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.) | |
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| Items | – Name: Title Label: Title Group: Ti Data: Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhang%2C+Feichi%22">Zhang, Feichi</searchLink><relatesTo>1</relatesTo><i> feichi.zhang@kit.edu</i><br /><searchLink fieldCode="AR" term="%22Baust%2C+Tobias%22">Baust, Tobias</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zirwes%2C+Thorsten%22">Zirwes, Thorsten</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Denev%2C+Jordan%22">Denev, Jordan</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Habisreuther%2C+Peter%22">Habisreuther, Peter</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zarzalis%2C+Nikolaos%22">Zarzalis, Nikolaos</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Bockhorn%2C+Henning%22">Bockhorn, Henning</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Energy+Technology%22">Energy Technology</searchLink>. Jul2017, Vol. 5 Issue 7, p1055-1063. 9p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Combustion%22">Combustion</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+conversion%22">Energy conversion</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Combustion is an important part of most current and future overall energy-conversion systems, especially if using renewable fuels in energy-storage concepts. Therefore, the laminar flame speed, which is a key parameter for the design of combustion systems, needs to be known for a growing multitude of different thermodynamic conditions and fuels. The spherically expanding flame method is one of the few techniques that enables the flame speed to be measured under particular conditions such as elevated pressure and temperature as well as under turbulent conditions, which are important for energy-conversion applications. The radius of a spherically propagating flame is tracked and used for evaluation of the flame speed. Usually, the flame is assumed to be infinitely thin. To assess the influence of this assumption, direct numerical simulations were conducted for the experimental setup and compared with measurements and correlations from the literature. The flame speed determined by the consumption rate of fuel, which takes a finite thickness of the flame into account, was found to be always larger than the flame speed computed by assuming an infinitely thin flame. The difference between these flame speeds was observed to be as large as approximately 10-20 % in the evaluation range of the measured flame radii, which decreases with growing flame radius. This gives rise to the discrepancies in the flame speeds obtained from different measurement methods. An analytical estimation for this difference was developed as a function of the flame radius, which showed quantitatively good agreement with the simulation results and may be used for experimental validations of the flame speed. Both premixed H2/air and CH4/air flames with equivalence ratios ranging from lean to rich conditions were studied. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Energy Technology is the property of Wiley-Blackwell 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.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/ente.201600573 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 1055 Subjects: – SubjectFull: Combustion Type: general – SubjectFull: Energy conversion Type: general Titles: – TitleFull: Impact of Infinite Thin Flame Approach on the Evaluation of Flame Speed using Spherically Expanding Flames. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhang, Feichi – PersonEntity: Name: NameFull: Baust, Tobias – PersonEntity: Name: NameFull: Zirwes, Thorsten – PersonEntity: Name: NameFull: Denev, Jordan – PersonEntity: Name: NameFull: Habisreuther, Peter – PersonEntity: Name: NameFull: Zarzalis, Nikolaos – PersonEntity: Name: NameFull: Bockhorn, Henning IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 21944288 Numbering: – Type: volume Value: 5 – Type: issue Value: 7 Titles: – TitleFull: Energy Technology Type: main |
| ResultId | 1 |
