Effects of pressure on instability and cellularity of propagating spherical laminar flames: 1st report, cell formation and critical Peclet number

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Abstract

Cellularity of the propagating spherica) -laminar flames induced by the flame instability was studied for methane and propane- air mixtures at the equivalence ratios from 0.8 to 1.3 and the initial pressure from 0.10 to 0.50 MPa. The Markstein number was employed to quantify the effects of the equivalence ratio and the pressure of the mixture on the cellularity due to the flame instability. The critical Peclet number, or the critical flame radius normalized by the flame thickness, at which the cells are created over the entire laminar flame surface, decresed with decreasing the equivalence ratio for the methane mixture and decreased with increasing the equivalence ratio for the propane mixture. It decreased with increasing the initial pressure at all the equivalence ratios. It decreased as the Markstein number decreased. The flame was no longer stabilized by the flame stretch at the large Peclet number though the positive flame stretch will restrain the Darrieus Landau flame instability. Especially with the negative Markstein number, the flame was unstable even at the small Peclet number.

Original languageEnglish
Pages (from-to)2649-2656
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume70
Issue number698
DOIs
Publication statusPublished - Jan 1 2004

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Peclet number
flames
cells
equivalence
Propane
Methane
propane
methane
Air
radii
air

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

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title = "Effects of pressure on instability and cellularity of propagating spherical laminar flames: 1st report, cell formation and critical Peclet number",
abstract = "Cellularity of the propagating spherica) -laminar flames induced by the flame instability was studied for methane and propane- air mixtures at the equivalence ratios from 0.8 to 1.3 and the initial pressure from 0.10 to 0.50 MPa. The Markstein number was employed to quantify the effects of the equivalence ratio and the pressure of the mixture on the cellularity due to the flame instability. The critical Peclet number, or the critical flame radius normalized by the flame thickness, at which the cells are created over the entire laminar flame surface, decresed with decreasing the equivalence ratio for the methane mixture and decreased with increasing the equivalence ratio for the propane mixture. It decreased with increasing the initial pressure at all the equivalence ratios. It decreased as the Markstein number decreased. The flame was no longer stabilized by the flame stretch at the large Peclet number though the positive flame stretch will restrain the Darrieus Landau flame instability. Especially with the negative Markstein number, the flame was unstable even at the small Peclet number.",
author = "Toshiaki Kitagawa and Tomomi Ogawa and Yukihide Nagano",
year = "2004",
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journal = "Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B",
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number = "698",

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TY - JOUR

T1 - Effects of pressure on instability and cellularity of propagating spherical laminar flames

T2 - 1st report, cell formation and critical Peclet number

AU - Kitagawa, Toshiaki

AU - Ogawa, Tomomi

AU - Nagano, Yukihide

PY - 2004/1/1

Y1 - 2004/1/1

N2 - Cellularity of the propagating spherica) -laminar flames induced by the flame instability was studied for methane and propane- air mixtures at the equivalence ratios from 0.8 to 1.3 and the initial pressure from 0.10 to 0.50 MPa. The Markstein number was employed to quantify the effects of the equivalence ratio and the pressure of the mixture on the cellularity due to the flame instability. The critical Peclet number, or the critical flame radius normalized by the flame thickness, at which the cells are created over the entire laminar flame surface, decresed with decreasing the equivalence ratio for the methane mixture and decreased with increasing the equivalence ratio for the propane mixture. It decreased with increasing the initial pressure at all the equivalence ratios. It decreased as the Markstein number decreased. The flame was no longer stabilized by the flame stretch at the large Peclet number though the positive flame stretch will restrain the Darrieus Landau flame instability. Especially with the negative Markstein number, the flame was unstable even at the small Peclet number.

AB - Cellularity of the propagating spherica) -laminar flames induced by the flame instability was studied for methane and propane- air mixtures at the equivalence ratios from 0.8 to 1.3 and the initial pressure from 0.10 to 0.50 MPa. The Markstein number was employed to quantify the effects of the equivalence ratio and the pressure of the mixture on the cellularity due to the flame instability. The critical Peclet number, or the critical flame radius normalized by the flame thickness, at which the cells are created over the entire laminar flame surface, decresed with decreasing the equivalence ratio for the methane mixture and decreased with increasing the equivalence ratio for the propane mixture. It decreased with increasing the initial pressure at all the equivalence ratios. It decreased as the Markstein number decreased. The flame was no longer stabilized by the flame stretch at the large Peclet number though the positive flame stretch will restrain the Darrieus Landau flame instability. Especially with the negative Markstein number, the flame was unstable even at the small Peclet number.

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JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B

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