Effects of Mixture Inhomogeneity and Gas Flow on Combustion in Premixed-charge Compression Ignition Engines-Three-dimensional Numerical Analysis of Combustion Process in Consideration of Chemical Kinetics

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  • Kim Sang-kyu
    大阪市立大学大学院工学研究科機械物理系専攻
  • Takada Yogo
    大阪市立大学大学院工学研究科機械物理系専攻
  • Wakisaka Tomoyuki
    大阪市立大学大学院工学研究科機械物理系専攻

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Other Title
  • 予混合圧縮着火機関における燃料濃度分布の不均一性とガス流動が燃焼に及ぼす影響―化学動力学を考慮した燃焼過程の三次元数値解析
  • ヨコンゴウ アッシュク チャッカ キカン ニ オケル ネンリョウ ノウド ブンプ ノ フキンイツセイ ト ガス リュウドウ ガ ネンショウ ニ オヨボス エイキョウ カガク ドウリキガク オ コウリョシタ ネンショウ カテイ ノ 2ジゲン スウチ カイセキ
  • -Three-dimensional Numerical Analysis of Combustion Process in Consideration of Chemical Kinetics
  • ―化学動力学を考慮した燃焼過程の三次元数値解析

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Abstract

In order to investigate the effects of mixture Inhomogeneity and gas flow on combustion and emissions in a premixed-charge compression ignition engine, three-dimensional numerical analysis of the combustion process was carried out by using the authors' GTT-CHEM code, which was linked to the CHEMKIN-II code. Combustion processes of gas oil and air mixtures (overall equivalence ratio was set at 0.4) under various initial conditions of mixture inhomogeneity and gas flow (swirl or tumble flow) were computed in consideration of chemical kinetics. It has been found that the maximum rate of pressure rise decreases as the mixture inhomogeneity becomes higher. On the contrary, the concentrations of combustion products NO, CO and HC increase, and the combustion efficiency becomes lower with the increase of mixture inhomogeneity. As a result, it has been shown that there exist appropriate initial conditions of mixture inhomogeneity and gas flow for suppressing the maximum rate of pressure rise with relatively low emissions of NO, CO and HC at high combustion efficiency.

Journal

  • Marine Engineering

    Marine Engineering 42 (4), 622-629, 2007

    The Japan Institute of Marine Engineering

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