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Three-Dimensional Computation of the Scavenging Flow Process in a Motored Two-Stroke Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1993 by SAE International in United States
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An advanced multi-domain CFD analysis approach is proposed to calculate the scavenging flow process in motored two-stroke engines. An implicit and conservative treatment at the domain interface is developed which offers significant speedup in convergence. An arbitrary Lagrangian-Eulerian approach for moving grid and a grid remeshing technique for grid sliding at engine cylinder/transfer ports interfaces are used for efficiency and accuracy. A three-dimensional simulation of the Mercury Marine research two-stroke engine is carried out to demonstrate the approach. Six computational domains are used which naturally represent the geometries of the cylinder, engine dome, exhaust and transfer ports. The influence of boost port inclination angle on the scavenging process of the two-stroke engine is also studied numerically. The computation is supplemented with a standard two-equation turbulence model with compressibility correction. The calculated results show that the flow patterns vary rapidly with the piston motion. Complex non-uniform velocity distribution and vortical flows are developed in the engine cylinder and exhaust port. It is noticed that different arrangement of the boost port could alter the scavenging process significantly. In general, it is found that better scavenging efficiency is obtained with increasing boost angle.
CitationLai, Y., Przekwas, A., and Sun, R., "Three-Dimensional Computation of the Scavenging Flow Process in a Motored Two-Stroke Engine," SAE Technical Paper 930499, 1993, https://doi.org/10.4271/930499.
- 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 851519 1985
- Ahmadi-Befrui B. Brandstatter W. Kratochwill H. “Multidimensional Calculation of the Flow Processes in a Loop-Scavenged Two-Stroke Cycle Engine,” SAE Paper 890841 1989
- Nishimoto K. Kamimoto T. “A Study on the Influence of Inlet Angle and Reynolds Number on the Flow Pattern of Uniflow Scavenging Air,” SAE Paper 841056 1984
- Bardsley M.E.A. Gajdeczko B. Boulouchos K. Cherhroudi B. Bracco F.V. “Measurements of the Three Components of the Velocity in the Intake Ports of an I.C. Engine,” SAE Paper 890792 1989
- Epstein P.H. Reitz R.D. Foster D.E. “Computations of a Two-Stroke Engine Cylinder and Port Scavenging Flows,” SAE Paper 910672 1991
- Amsden A.A. O'Rourke P.J. Butler T.D. Meintjes K. Fansler T.D. “Computations of Computed and Measured Three-Dimensional Velocity Fields in a Motored Two-Stroke Engine,” SAE Paper 920418 1992
- Trulio J.G. Trigger K.R. “Numerical Solution of the One-Dimensional Hydrodynamic Equations in an Arbitrary Time-Dependent Coordinate System,” Univ. of California Lawrence Radiation Lab Report UCLR-6522 1961
- Lai Y.G. Przekwas A.J. “A Finite Volume Method for Fluid Flow Simulations with Moving Boundaries,” Submitted for Publication 1992
- Lai Y.G. Jiang Y. Przekwas A.J. “An Implicit Multi-Domain Approach for the Solution of Navier-Stokes Equations in Body-Fitted-Coordinate Grids,” AIAA Paper No. 93-0541, 31st AIAA Aerospace Sciences Meeting and Exhibit, Reno, Nevada 1993