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Effects of Swirl/Tumble Motion on In-Cylinder Mixture Formation in a Lean-Burn Engine
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Abstract
Flow measurement by laser Doppler velocimetry and visualization of in-cylinder fuel vapor motion by laser induced fluorescence were performed for various types of intake systems that generated several different combinations of swirl and tumble ratios. The measured results indicate that certain swirl and tumble ratios are needed to achieve charge stratification in the cylinder. Performance tests were also carried out to determine the combustion characteristics of each intake system. Then, the features of combustion when the charge stratification was realized was analyzed.
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Urushihara, T., Nakada, T., Kakuhou, A., and Takagi, Y., "Effects of Swirl/Tumble Motion on In-Cylinder Mixture Formation in a Lean-Burn Engine," SAE Technical Paper 961994, 1996, https://doi.org/10.4271/961994.Also In
References
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- Quader A. A. “The Axially-Stratified-Charge Engine” SAE Paper 820131
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- Lee K. Urushihara T. et al. “Analysis of Gas Flow Fields Generated by Butterfly Type Swirl Control Valve” Transactions of JSAE 9304365 (in Japanese with English summary) 24 3 22 1993
- Bates S. C. “A Transparent Engine for Flow and Combustion Visualization Studies” SAE Paper 880520