This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Numerical Study of Scavenging Flow in Poppet-Valved Two-Stroke Engines
Technical Paper
1999-01-1250
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
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.
Recommended Content
Authors
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.Also In
References
- Hundleby, G. E. “Development of a poppet-valved two-stroke engine - The Flagship Concept” SAE 900802 1990
- Stokes, J. Hundleby, G. E. Lake, T. H. Christie “Development Experience of a Poppet-Valved Two-Stroke Flagship Engine” SAE 920778 1992
- Nakano, M. Sato, K. Ukawa, H. “A Two-stroke Cycle Gasoline Engine with Poppet Valvs on the Cylinder Head” SAE 901664 1990
- Nomura, K. Nakamura, N. “Development of a New Two-Stroke Engine with Poppet-Valves: Toyota S-2 Engine” International Seminar November 1993 Rueil-Malmaison, France
- Morita, Y. Inoue, H. “Development of a Poppet-Valved Two-Stroke Engine” SUZUKI TECHNICAL REVIEW 22 1996 1 7
- Huh, K. Y. Kim, K. K. Choi, C. R. Park, S. C. Moon, S. Lee, K. Y. “Scavenging Flow Simulation of a Four-Poppet-Valved Two-Stroke Engine” SAE 930500 1993
- Kang, K. Y. Lee, J. W. Jeong, Y. I. Huh, K. Y. Jeong, H. T. “The Characteristics of Scavenging Flow in a Poppet-Valve Type 2-Stroke Diesel Engine by Using RSSV System” SAE 960368 1996
- Yang, X. F. Ishima, T Obokata, T. “High Speed Video Recording of Fog-Marked Scavenging Flow in a Motored Poppet-Valved Two-Stroke Engine” SAE 972736 1997
- Amsden, A. A. O'Rourke, P. J. Butler, T. D. “KIVA-II: A Computer Program for Chemically Reactive Flows With Sprays” Los Alamos National Laboratory Report LA-11560-MS LOS ALAMOS, NM 1989
- Amsden, A. A. “KIVA-3: A KIVA Program with Block-Structured Mesh for Complex Geometries” Los Alamos National Laboratory Report LA-12503-MS LOS ALAMOS, NM 1993
- Amsden, A. A. “KIVA-3V: A Block-Structured KIVA program for Engines with Vertical or Canted Valves” Los Alamos National Laboratory Report LA-13313-MS LOS ALAMOS, NM 1997
- Amsden, A. A. O'Rourke, P. J. Butler, T. D. Meintjes, M. Fansler, T. D. “Comparisons of Computed and Measured Three-Dimensional Velocity Fields in a Motored Two-Stroke Engine” SAE 920418 1992
- Kong, S. C. Hong, C. W. “Multidimensional Intake Flow Modeling of a Four-Stroke Engine with Comparisons to Flow Velocity Measurements” SAE 970883 1997