Numerical Study of Scavenging Flow in Poppet-Valved Two-Stroke Engines

Paper #:
  • 1999-01-1250

Published:
  • 1999-03-01
Citation:
Yang, X., Okajima, A., Takamoto, Y., and Obokata, T., "Numerical Study of Scavenging Flow in Poppet-Valved Two-Stroke Engines," SAE Technical Paper 1999-01-1250, 1999, https://doi.org/10.4271/1999-01-1250.
Pages:
20
Abstract:
Three-dimensional computations are performed to investigate the scavenging characteristics of poppet-valved two-stroke engines. The new subroutines are developed to handle various valve shrouds. Visualization of scavenging flow on a modified two-stroke transparent cylinder engine is used for validation and compared well in flow pattern. The flows in engines with different configurations are simulated at a speed of 5000 r/min. The stroke bore/ratio and valve arrangements were considered to investigate their effects on the scavenging flows. Additionally, valve timing and boost pressure have also been studied. The results show that stroke/bore ratio of 0.4 to 0.6, shroud angle of 69° to 108°, turn angle of shroud of 18° to 28°, average tumble ratio of 1.2-1.6 were found to be the optimum range for effective scavenging.
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