A Study of Gasoline HCCI Combustion Accompanied by Pressure Oscillations Based on Flame Visualization in the Entire Bore Area

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  • ボア全域可視化による筒内圧力振動を伴うガソリンHCCI 燃焼の研究
  • ボア ゼンイキ カシカ ニ ヨル ツツ ナイアツリョク シンドウ オ トモナウ ガソリン HCCI ネンショウ ノ ケンキュウ

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This study investigated the mechanism causing abnormal combustion accompanied by pressure oscillations during the gasoline HCCI combustion using an optically accessible engine. The results revealed that the pressure rise rate was increased by advancing the ignition timing and increasing the equivalence ratio. It addition, it was found that stronger pressure oscillations occurred as the maximum pressure rise rate increased. The results indicated that autoignition began locally and gradually spread throughout the entire cylinder. However, under a condition where pressure oscillations occurred, locally initiated autoignition caused rapid ignition of unburned fuel at multiple locations simultaneously in the process of gradually spreading throughout the cylinder.

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