Local quenching phenomena of lean turbulent premixed flame formed in a wall stagnation flow

Yuji Yahagi, Toshihisa Ueda, Masahiko Mizomoto

Research output: Contribution to journalArticle

Abstract

Lewis number effect on the local quenching phenomena of lean methane/air and propane/air turbulent premixed flames formed in a wall stagnation point flow have been studied experimentally. The stretch rate due to flow divergence was 60 s-1, while the turbulent intensity of velocity fluctuation in the approach flow was 0.38 m/s. The flame front behavior was taken by using laser tomographic technique with a 16 mm high speed camera. Near the extinction limit, the flame front reaches the cooled wall. Then, the flame is locally quenched, though it is globally stable. The local quenching occurs when the concave curvature to the unburnt gas is close to the cooled wall. The local quenching is sensitive to the Lewis number in that its probability of lean methane/air flame (Le>1) is more than ten times that of propane/air flame (Le>1). This suggests that the interaction of the cooled wall and flame front plays an important role in the local quenching of lean methane/air flame. When the cusp flame front reaches the cooled wall, the duration of local quenching time is short. In this case, the local quenching area may be small, and the global extinction does not occur. On the other hand, when the small curvature flame front reaches the cooled wall, the time is long. Then, the local quenching area may be large, and the local quenching become a trigger to develop the global extinction.

Original languageEnglish
Pages (from-to)262-268
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume63
Issue number616
Publication statusPublished - 1997 Dec
Externally publishedYes

Fingerprint

stagnation flow
Wall flow
turbulent flames
premixed flames
Quenching
quenching
flame propagation
flames
air
Lewis numbers
Air
Methane
extinction
methane
Propane
propane
curvature
stagnation point
high speed cameras
High speed cameras

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

Local quenching phenomena of lean turbulent premixed flame formed in a wall stagnation flow. / Yahagi, Yuji; Ueda, Toshihisa; Mizomoto, Masahiko.

In: Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 63, No. 616, 12.1997, p. 262-268.

Research output: Contribution to journalArticle

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