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Tumbling Motion: A Mechanism for Turbulence Enhancement in Spark-Ignition Engines
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Abstract
The ability of certain induction systems to enhance turbulence levels at the time of ignition, through formation of long-lived tumbling vortices on the plane of the valve and cylinder axes, has been investigated in a two-valve spark-ignition engine by rotating the intake port at 90° and 45° to the orientation of production directed ports. Detailed measurements of the three velocity components, obtained by laser velocimetry, revealed that the 90° port generated a pure tumble motion, with a maximum tumbling vortex ratio of 1.5 at 295°CA, zero swirl, and 42% turbulence enhancement relative to the standard configuration, while the 45° port gave rise to a combined tumble/swirl structure with a maximum tumbling vortex ratio of 0.5 at 285°CA, swirl ratio of 1.0 at TDC, and turbulence enhancement of 24%. The implications of the two types of flow structures for combustion are discussed.
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Authors
- C. Arcoumanis - Department of Mechanical Engineering, Imperial College of Science Technology and Medicine
- Z. Hu - Department of Mechanical Engineering, Imperial College of Science Technology and Medicine
- C. Vafidis - Department of Mechanical Engineering, Imperial College of Science Technology and Medicine
- J. H. Whitelaw - Department of Mechanical Engineering, Imperial College of Science Technology and Medicine
Citation
Arcoumanis, C., Hu, Z., Vafidis, C., and Whitelaw, J., "Tumbling Motion: A Mechanism for Turbulence Enhancement in Spark-Ignition Engines," SAE Technical Paper 900060, 1990, https://doi.org/10.4271/900060.Also In
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