Fundamental Characteristics of Ignition-Combustion of Rich Mixture Plume in High Pressure Direct Injection Hydrogen Engines

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  • 高圧筒内直接噴射水素エンジンの過濃混合気噴流点火の基礎的特性の研究
  • コウアツトウ ナイ チョクセツ フンシャ スイソ エンジン ノ カノウコンゴウキフンリュウ テンカ ノ キソテキ トクセイ ノ ケンキュウ

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Abstract

A new ignition-combustion concept named PCC (Plume Combustion Concept), which ignites rich mixture plume right after injection of hydrogen is finished, is proposed by the authors in order to reduce NOx emissions without offering any tradeoffs on decreasing output power and thermal efficiency. In this study fundamental requirements of hydrogen jet to optimize PCC are investigated by using single hydrogen jet. As a result it was clarified that reducing jet penetration to piston bowl, reducing hydrogen wetting to cylinder head wall and igniting in the middle of mixture plume are effective to minimize NOx emissions and maximize thermal efficiency.

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