Scavenging Flow Velocity in Small Two-Strokes at High Engine Speed

Paper #:
  • 951789

Published:
  • 1995-09-01
Citation:
Ekenberg, M. and Johansson, B., "Scavenging Flow Velocity in Small Two-Strokes at High Engine Speed," SAE Technical Paper 951789, 1995, https://doi.org/10.4271/951789.
Pages:
5
Abstract:
2D-LDV-measurements were made on the flow from one transfer channel into the cylinder in a small two-stroke SI engine. The LDV measuring volume was located just outside the transfer port. The engine was a carburetted piston-ported crankcase compression chainsaw engine and it was run with wide open throttle at 9000 RPM. The muffler was removed to enable access into the cylinder. No additional seeding was used; the fuel and/or oil was not entirely vaporized as it entered the cylinder. Very high velocities (-275 m/s) were detected in the beginning of the scavenging phase. The horizontal velocity was, during the whole scavenging phase, higher than the vertical.
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