Extinction Mechanism of Lean Premixed Flames in a Laminar Stagnation Point Flow

Yuji Yahagi; Toshihisa Ueda; Masahiko Mizomoto

doi:10.1299/kikaib.58.2878

Extinction Mechanism of Lean Premixed Flames in a Laminar Stagnation Point Flow

Yuji Yahagi, Toshihisa Ueda, Masahiko Mizomoto

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

Effects of heat loss and flame stretch on the lean-limit extinction of laminar premixed flames in a stagnation point flow have been studied experimentally. The bulk stretch rate was varied from 40 s^-1 to 420 s^-1 while the Lewis number (Le) was varied from 0.85 to 1.8. The extinction of the lean propane/air flame (Le>1) is mainly caused by the flame stretch. On the other hand, the extinction of lean methane/air and lean methane/CCVC flames (Le<1) is caused not only by flame stretch but also by heat loss, since the flame is intensified by the Lewis number effect. Therefore, heat loss is predominant in the case of the lean methane/CO₂-O₂ flame whose Lewis number is smaller than that of the lean methane/air flame.

Original language	English
Pages (from-to)	2878-2883
Number of pages	6
Journal	Transactions of the Japan Society of Mechanical Engineers Series B
Volume	58
Issue number	553
DOIs	https://doi.org/10.1299/kikaib.58.2878
Publication status	Published - 1992

Keywords

Combustion Phenomena
Extinction
Flame Stretch
Heat Loss
Laminar Stagnation Point Flow
Laser Tomography
Premixed Combustion

ASJC Scopus subject areas

Condensed Matter Physics
Mechanical Engineering

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10.1299/kikaib.58.2878

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title = "Extinction Mechanism of Lean Premixed Flames in a Laminar Stagnation Point Flow",

abstract = "Effects of heat loss and flame stretch on the lean-limit extinction of laminar premixed flames in a stagnation point flow have been studied experimentally. The bulk stretch rate was varied from 40 s-1 to 420 s-1 while the Lewis number (Le) was varied from 0.85 to 1.8. The extinction of the lean propane/air flame (Le>1) is mainly caused by the flame stretch. On the other hand, the extinction of lean methane/air and lean methane/CCVC flames (Le<1) is caused not only by flame stretch but also by heat loss, since the flame is intensified by the Lewis number effect. Therefore, heat loss is predominant in the case of the lean methane/CO2-O2 flame whose Lewis number is smaller than that of the lean methane/air flame.",

keywords = "Combustion Phenomena, Extinction, Flame Stretch, Heat Loss, Laminar Stagnation Point Flow, Laser Tomography, Premixed Combustion",

author = "Yuji Yahagi and Toshihisa Ueda and Masahiko Mizomoto",

year = "1992",

doi = "10.1299/kikaib.58.2878",

language = "English",

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publisher = "Japan Society of Mechanical Engineers",

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T1 - Extinction Mechanism of Lean Premixed Flames in a Laminar Stagnation Point Flow

AU - Yahagi, Yuji

AU - Ueda, Toshihisa

AU - Mizomoto, Masahiko

PY - 1992

Y1 - 1992

N2 - Effects of heat loss and flame stretch on the lean-limit extinction of laminar premixed flames in a stagnation point flow have been studied experimentally. The bulk stretch rate was varied from 40 s-1 to 420 s-1 while the Lewis number (Le) was varied from 0.85 to 1.8. The extinction of the lean propane/air flame (Le>1) is mainly caused by the flame stretch. On the other hand, the extinction of lean methane/air and lean methane/CCVC flames (Le<1) is caused not only by flame stretch but also by heat loss, since the flame is intensified by the Lewis number effect. Therefore, heat loss is predominant in the case of the lean methane/CO2-O2 flame whose Lewis number is smaller than that of the lean methane/air flame.

AB - Effects of heat loss and flame stretch on the lean-limit extinction of laminar premixed flames in a stagnation point flow have been studied experimentally. The bulk stretch rate was varied from 40 s-1 to 420 s-1 while the Lewis number (Le) was varied from 0.85 to 1.8. The extinction of the lean propane/air flame (Le>1) is mainly caused by the flame stretch. On the other hand, the extinction of lean methane/air and lean methane/CCVC flames (Le<1) is caused not only by flame stretch but also by heat loss, since the flame is intensified by the Lewis number effect. Therefore, heat loss is predominant in the case of the lean methane/CO2-O2 flame whose Lewis number is smaller than that of the lean methane/air flame.

KW - Combustion Phenomena

KW - Extinction

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KW - Heat Loss

KW - Laminar Stagnation Point Flow

KW - Laser Tomography

KW - Premixed Combustion

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Extinction Mechanism of Lean Premixed Flames in a Laminar Stagnation Point Flow

Abstract

Keywords

ASJC Scopus subject areas

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