球状伝播層流火炎の不安定性とセル状化に及ぼす圧力の影響(第1報,セル状火炎への遷移および臨界Peclet数):第1報, セル状火炎への遷移および臨界Peclet数

Translated title of the contribution: Effects of Pressure on Instability and Cellularity of Propagating Spherical Laminar Flames (1st Report, Cell Formation and Critical Peclet Number):1st Report, Cell Formation and Critical Peclet Number

北川 敏明, 小川 知美, 永野 幸秀

Research output: Contribution to journalArticle

Abstract

Cellularity of the propagating spherical 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.
Translated title of the contributionEffects of Pressure on Instability and Cellularity of Propagating Spherical Laminar Flames (1st Report, Cell Formation and Critical Peclet Number):1st Report, Cell Formation and Critical Peclet Number
Original languageJapanese
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 - 2004

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