Spark-Discharge Behavior in Gasoline Spark-Ignition Engine

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  • ガソリン火花点火エンジンにおける火花放電挙動
  • ガソリン ヒバナ テンカ エンジン ニ オケル ヒバナ ホウデン キョドウ

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Abstract

<p>Combustion of a gasoline spark-ignition engine is initiated with the spark discharge formed at a spark-plug. High temperature plasma formed at the spark-plug develops and forms initial flame kernel with very thin reaction zone. Key features of spark discharge are stable ignition of super-lean, highly diluted mixture and durability to higher turbulent flow. This report explains the ignition process through formation of spark discharge at the spark-plug to initiation of initial flame kernel. The formation process of spark discharge is explained from the point of view of plasma physics. Visualization of spark discharge and initial flame kernel were carried out in a compression-expansion machine (CEM) using two high-speed cameras. Shroud attached to intake valve was used to enhance the flow field in cylinder. The initial flame and spark discharge were obtained from these images under different flow field conditions. Moreover, several spark ignition models were explained for 3D CFD of gasoline spark-ignition engine.</p>

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