Velocity Field Characteristics in Motored Two-Stroke Ported Engines

Paper #:
  • 920419

Published:
  • 1992-02-01
Citation:
Ghandhi, J. and Martin, J., "Velocity Field Characteristics in Motored Two-Stroke Ported Engines," SAE Technical Paper 920419, 1992, https://doi.org/10.4271/920419.
Pages:
14
Abstract:
Particle image velocimetry (PIV) was used to study the velocity field characteristics in motored two-stroke ported engines. Measurements of the two-dimensional velocity field were made at the midplane of the clearance volume for bowl-in-head and disk combustion chamber geometries. Measurements were also obtained for two scavenging port geometries, i.e. a loop-scavenged engine and a loop-scavenged engine with a boost port.Results from this study show that in-cylinder geometry had a dominant effect on the flow structure observed at TDC. For example, with the boost-port scavenging crankcase, the disk-shaped chamber showed a turbulent flow-field at TDC with little large scale motion. In contrast, addition of a squish flow from the bowl-in-head geometry produced an organized cross-chamber flow.The addition of a boost port also changed the flow structure markedly. A large-scale swirl flow was observed in the engine that did not contain a boost port. In contrast, the boost port apparently breaks down the tendency to swirl.
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