This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
CFD Investigation of the Scavenging Process in a Two-Stroke Engine
Annotation ability available
Sector:
Language:
English
Abstract
Computational fluid dynamics simulations of the gas exchange process in a crankcase-scavenged, two-stroke engine were used to study the scavenging characteristics of the engine over the whole operating range and to investigate the effects of various design changes. The simulations used time-dependent velocity and pressure boundary conditions in the transfer and exhaust ports, respectively, which were obtained from a one-dimensional gas exchange code. The bulk flow characteristics, scavenging and trapping efficiencies, computed from these simulations compared well with experimental data. Investigation of the highest load and speed case showed that moderate port angle variations only weakly influenced the scavenging efficiency and velocity field. On the other hand, modifying the exhaust pressure to simulate single cylinder operation had a more significant effect on the scavenging and showed a possible way to control the gas exchange process.
Recommended Content
Technical Paper | Predicting and Optimizing Two-Stroke Engine Performance Using Multidimensional CFD |
Technical Paper | Engine Friction Modeling |
Technical Paper | Computational Aero-acoustics Simulation of Whistle Noise in An Automotive Air-Intake System |
Authors
Citation
Leep, L., Strumolo, G., Griaznov, V., Sengupta, S. et al., "CFD Investigation of the Scavenging Process in a Two-Stroke Engine," SAE Technical Paper 941929, 1994, https://doi.org/10.4271/941929.Also In
References
- Blair, G.P. The Basic Design of Two-Stroke Engines SAE Warrendale, PA 1990
- Ahmadi-Berufi, B. Brandstatter, W. Kratochwill, H. “Multi-dimensional Calculation of the Flow Processes in a Loop-Scavenged Two-Stroke Engine” SAE Paper 890841 1989
- Sweeney, M.E.G. Swann, G.B.G. Kenny, R.G. Blair, G.P. Computational Fluid Dynamics Applied to Two-Stroke Engine Scavenging” SAE Paper 900800 1990
- Smyth, J.G. Kenny, R.G. Blair, G.P. “Motored and Steady Flow Boundary Conditions Applied to the Prediction in a Loop-Scavenged Two-Stroke Cycle Engine” SAE Paper 900800 1990
- Epstein, P.H. Reitz, R.D. Foster, D.E. “Computations of a Two-Stroke Engine Cylinder and Port Scavenging Flows” SAE Paper 910672 1991
- Amdsen, A.A. O'Rourke, P.J. Butler, T.D. “Comparison of Computed and Measured Three-Dimensional Velocity Fields in a Motored Two-Stroke Engine” SAE Paper 920418 1992
- Haworth, D.C. Huebler, M.S. EI Tahry, S.H. Matthes, W.R. “Multidimensional Calculations for a Two-Cycle Engine: A Detailed Scavenging Model Validation” SAE Paper 932712 1993
- Lai, Y.-G. Przekwas, A.J. Sun, R.L.T. “Three-Dimensional Computation of the Scavenging Flow Process in a Motored Two-Stroke Engine” SAE Paper 930499 1993
- FIRE 5.1 User Guide Second AVL 1993
- Tobis, B.J. Meyer, R. Yang, J. Brehob, D.D. Anderson, R.W. “Scavenging of a Firing Two-Stroke Spark-Ignition Engine” SAE Paper 940393