This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Air Motion in a Two Stroke Engine Cylinder - The Effects of Exhaust Geometry
Annotation ability available
Sector:
Language:
English
Abstract
Air motion in one cylinder of a Detroit Diesel 6V-92 two stroke diesel engine was studied under steady flow bench test conditions by a laser Doppler anemometer and an axisymmetric finite difference fluid dynamic model. The effects of four different exhaust opening geometries were explored.
Measurements and calculations showed that the swirl induced by the 18 angled inlet ports produced non-uniform axial velocity profiles and large peaks in the mid-radius region (between cylinder center and wall). The exhaust opening geometry in the head of the cylinder influenced these axial velocity fields especially in the upper region of the cylinder. The study concluded that more uniform flow, which is favorable to the scavenging process, can be achieved by an exhaust opening located close to the cylinder periphery.
Recommended Content
Technical Paper | COMBUSTION CHAMBER AND CYLINDER DESIGN |
Technical Paper | The Effect of Combustion Chamber Geometry in a SI Engine |
Technical Paper | The New Collins Compact Scotch Yoke Engine |
Authors
Citation
Sung, N. and Patterson, D., "Air Motion in a Two Stroke Engine Cylinder - The Effects of Exhaust Geometry," SAE Technical Paper 820751, 1982, https://doi.org/10.4271/820751.Also In
References
- Spanogle Buckley, “The NACA Combustion Chamber Gas Sampling Valve and Some Preliminary Test Results,” NACA 1933
- Boyer, R. L. Craig D. R. Miller, C. D. “A Photographic Study of Events in a 14 inch Two-Cycle Gas Engine Cylinder,” ASME Trans 76 1954 97
- Percival, W. H. “Method of Scavenging Analysis for 2-Stroke-Cycle Diesel Cylinders,” SAE Transactions 63 1955 737
- Mann, L. B. “Engine Development-A-149 Engine-Port Flow,” Chrysler Corporation Engineering Division, Chrysler Corporation Detroit 1952
- Winsor R. E. Patterson, D. J. “Mixture Turbulence-A Key to Cyclic Combustion Variation,” SAE Paper 730086 1973
- Brandl, F. Reverencic, I. Cartellieri W. Dent, D. C. “Turbulent Air Flow in the Combustion Bowl of a D. I. Diesel Engine and its Effect on Engine Performance,” SAE Paper 790040 1979
- Engine Service Manual Detroit Diesel Allison Division G. M., Detroit 1979
- Durst, F. Melling A. Whitelaw, J. H. “Principles and Practice of Laser Doppler Anemometry,” Academic Press London 1976
- TSI Instruction Manual TSI Inc. St. Paul, Minnesota 1979
- Rabinowicz, E. “An Introduction to Experimentation,” Addison-Wesley Publishing Reading, Mass. 1970
- Patankar, S. V. “Numerical Heat Transfer and Fluid Flow,” McGraw-Hill Book Company, Inc. New York 1979
- Roache, P. J. “Computational Fluid Mechanics,” Hermosa Publishers Albuquerque, New Mexico 1972
- Douglas, J. Jr “A Note on the Alternate Direction Implicit Method for the Numerical Solution of Heat Flow Problems,” Proc. of the American Mathematical Society 8 1957 409 412
- Young D. M. Eidson, H. M. “On the Determination of the Optimum Relaxation Factor for the SOR Method when the Eigenvalues of the Jacobi Method are Complex,” University of Texas at Austin, Center for Numerical Analysis Austin, Texas 1970
- Sung, N. W. “Air Motion in a Two Stroke Diesel Engine Cylinder,” Ph.D. Thesis The University of Michigan Ann Arbor, Mi. 1981