予混合火炎の不安定性に及ぼす熱損失効果 The Effect of Heat Loss on the Instability of Premixed Flames

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The effect of heat loss on the instability of premixed flames is studied by two-dimensional unsteady calculations of reactive flows, based on the compressible Navier-Stokes equation. We take account of hydrodynamic and diffusive-thermal effects as to the intrinsic instability of premixed flames. A sufficiently small disturbance is superimposed on a planar flame to obtain the relation between the growth rate and the wave number. As the heat loss becomes larger, the growth rate decreases and the unstable range narrows. This is because that the hydrodynamic instability generated by thermal expansion becomes weaker. To study the unstable behavior of cellular flames, the disturbance with the linearly most unstable wave number, i.e., the critical wave number, is superimposed. The superimposed disturbance evolves, and the cellular-flame front is formed, owing to intrinsic instability. The lateral movement of cellular flames is observed at low Lewis numbers, and the behavior of cellular-flame fronts becomes more unstable for non-adiabatic flames. With an increase in the heat loss, the burning velocity of a cellular flame normalized by that of a planar flame increases at Lewis numbers lower than unity. When the Lewis number is not less than unity, on the other hand, the flame-velocity increment decreases by increasing the heat loss.

収録刊行物

  • 日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences

    日本航空宇宙学会論文集 = Journal of the Japan Society for Aeronautical and Space Sciences 52(608), 416-421, 2004-09-05

    一般社団法人 日本航空宇宙学会

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各種コード

  • NII論文ID(NAID)
    10013578171
  • NII書誌ID(NCID)
    AA11307372
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    13446460
  • NDL 記事登録ID
    7093241
  • NDL 雑誌分類
    ZN25(科学技術--運輸工学--航空機・ロケット)
  • NDL 請求記号
    Z74-B503
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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