新たな乱流燃焼モデルの提案とその評価 : 第2報, 火炎伸長の評価

概要

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The authors evaluated the quench effect due to flame stretch and proposed a new turbulent combustion model based on a HTA (hyperbolic tangent approximation) theory for a counter premixed combustion of unburned/unburned jets and burned/unburned jets. The main results were as follows : (1) Reaction progress variable c at the stagnation point of counter flow decreases with flame stretch. The flame quench occurs at c=0.7. (2) A laminar flame quench occurs at (gδ/Su) ≧1.62 (g ; velocity gradient, δ : thickness of laminar flame, Su : laminar burning velocity) for the unburned/unburned system. This result was in good agreement with experimental data^<(2)〜(6)>. And the other, the laminar flame quench occurs (gδ/Su) ≧ 2.66 for the burned/unburned system. (3) Above-mentioned results were also applicable to evaluate turbulent burning speed. The predicted turbulent burning velocity was compared with experimental data by Abdel-Gayed et al.^<(8)>.
社団法人日本機械学会の論文
1997-05-25