This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
The Correlation of Theory and Experiment for Scavenging Flow in Two-Stroke Cycle Engines
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
At The Queen's University of Belfast there has been, for some twenty years, a continuing program of research into scavenging flow in two-stroke cycle engines, recently using a single-cycle gas scavenging apparatus. This apparatus has been demonstrated to give accurate assessments of the scavenging efficiencies of such engine cylinders. The apparatus utilises a constant volume, isothermal flow process in the experimental simulation of the scavenging flow and, as many of the classic theories of scavenging are similarly formulated, this provides a unique opportunity to compare theory and experiment on the basis of equality of procedure. This paper presents experimental data for the scavenging characteristics of uniflow-, loop-and cross-scavenged two-stroke engine cylinders and compares the measurements with the classic theories of scavenging as presented by others in the literature. It is shown that none of the classic theories of scavenging are able to correlate with the experimental facts over the full range of scavenge ratios. A model of scavenging is proposed which does fit the experimental facts in all cases and this theoretical model is easily solved on a desk-top micro-computer; a copy of the actual computer program, in BASIC, is provided for use by the reader. So that others may attempt to correlate their theories of scavenging with experiment, the author has included, in an appendix, the actual numeric values of the measured scavenging efficiency-scavenge ratio characteristics for uniflow-, cross-, and loop-scavenged engine cylinders.
Recommended Content
Citation
Blair, G., "The Correlation of Theory and Experiment for Scavenging Flow in Two-Stroke Cycle Engines," SAE Technical Paper 881265, 1988, https://doi.org/10.4271/881265.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
APPENDIX 1 | ||
APPENDIX 1 | ||
APPENDIX 1 |
Also In
References
- Blair G.P. “Studying Scavenge Flow in a Two-Stroke Cycle Engine” SAE Farm, Construction and Industrial Machinery Meeting Milwaukee, Wisconsin September 1975 SAE Paper No. 750752 9
- Blair G.P. Ashe M.C. “The Unsteady Gas Exchange Characteristics of a Two-Cycle Engine” SAE Farm, Construction and Industrial Machiner Meeting Milwaukee, Wisconsin September 1976 SAE Paper No. 760644 23
- Blair G.P. “A Computer Program for the Prediction of Noise and Performance Characteristics of a Two-Cycle Engine” The Queen's University of Belfast December 1977 24
- Blair G.P. Kenny R.G. “Further Developments in Scavenging Analysis for Two-Cycle Engines” SAE International Congress Detroit, Michigan February 1980 SAE paper No. 800038 15
- Sanborn D.S. Blair G.P. Kenny R.G. Kingsbury A.H. “Experimental Assessment of Scavenging Efficiency of Two-Stroke Cycle Engines” SAE Intnl. Off-Highway Vehicle Meeting Milwuakee, Wisconsin September 1980 SAE Paper No. 800975 18
- Sweeney M.E.G. Kenny R.G. Swann G.B. Blair G.P. “Single Cycle Gas Testing Method for Two-Stroke Engine Scavenging” SAE International Congress Detroit, Michigan February 1985 SAE Paper No. 850178 10
- Sweeney M.E.G. Kenny R.G. Swann G.B. Blair G.P. “Computational Fluid Dynamics Applied to Two-Stroke Engine Scavenging” SAE Intnl. Off-Highway Vehicle Meeting Milwuakee, Wisconsin September 1985 SAE Paper No. 851519 20
- Blair G.P. Kenny R.G. Smyth J.G. Sweeney M.E.G. Swann G.B. “An Experimental Comparison of Loop and Cross Scavenging of the Two-Stroke Cycle Engine” SAE Intnl. Off-Highway Vehicle Meeting Milwaukee, Wisconsin September 1986 SAE Paper No. 861240 11
- Blair G.P. “Mixture Motion in the Cylinder of a Two-Stroke Cycle Engine Prior to Combustion” 19th International Symposium of Heat and Mass Transfer in Gasoline and Diesel Engines International Centre for Heat and Mass Transfer of Belgrade Dubrovnik August 24-28 1987 8
- Hopkinson B. “The Charging of Two-Cycle Internal Combustion Engines” Trans. NE Coast Instn. Engrs. Shipbuilders 30 1914 433
- Benson R.B. Whitehouse N.D. “Internal Combustion Engines” 2 Pergamon Press London 1979
- Baudequin F. Rochelle P. “Some Scavenging Models for Two-Stroke Engines” Proc. I.Mech.E. 194 1980 203 210
- Changyoll C. Wallace F.J. “A Generalised Isobaric and Isochoric Thermodynamic Scavenging Model” SAE Intnl. Off-Highway Vehicle Meeting Milwaukee, Wisconsin September 1987 SAE Paper No. 871657 15
- Blair G.P. Houston R.A.R. McMullan R.K. Steele N. Williamson S.J. “A New Piston Design for a Cross-Scavenged Two-Stroke Cycle Engine with Improved Scavenging and Combustion Characteristics” SAE Intnl. Off-Highway Vehicle Meeting Milwaukee, Wisconsin September 1984 SAE Paper No. 841096 12
- Blair G. P. “Prediction of Two-Cycle Engine Performance Characteristics” SAE Farm, Construction and Industrial Machinery Meeting Milwaukee, Wisconsin September 1976 SAE Paper No. 760645 10