Other Conference Proceedings


TitleC.S. Bae, J.H. Lee, K.Y. Kang and S.M. Oh, "The Effects of Intake Port Design on Flame Propagation in a Lean Burn Spark-Ignition Engine," SAE Paper 971300, pp303-308, Proc. the Ninth International Pacific Conference on Automotive Engineering (IPC-9), Bali, Indonesia, Nov. 1997.

C. S. Bae, J.H. Lee, K.Y. Kang and S.M. Oh, “The Effects of Intake Port Design on Flame Propagation in a Lean Burn Spark-Ignition Engine,” SAE Paper 971300, pp303-308, Proc. the Ninth International Pacific Conference on Automotive Engineering (IPC-9), Bali, Indonesia, Nov. 1997.

Abstract

Flame Propagation in an optical spark-ignition engine was visualized to see the effects of various shapes of intake ports on the combustion characteristics under lean burn conditions. The effects of tumble and swirl flows on the flame propagation were investigated experimentally in a 4-valve optical gasoline engine. The tumble flow patterns were generated by various intake ports of different entry angle; 25 ~ 20 ~ 15 ~ Inclined tumble( swirl) flows were induced by three different swirl control valves. The initial flame propagation was visualized by an image-intensified CCD camera. Flame images were processed to provide information on the flame size and convection correlated with tumble or inclined tumble flow characteristics. It was found that there is a correlation between the stronger tumble during induction and turbulence levels at the time of ignition resulting in faster flame development. Inclined tumble was proved to be more beneficial than the pure tumble for faster and stable combustion under lean mixture conditions, which was confirmed by faster propagating flame images.

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