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A More Complete Analysis of Unsteady Gas Flow Through a High-Specific-Output Two-Cycle Engine
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English
Abstract
The performance characteristics of a naturally aspirated two-cycle engine can be predicted with an unsteady gas dynamics analysis of flow through the crankcase and cylinder; such an analysis provides values of volumetric efficiency and trapping pressure at any given engine speed. The predictions of the volumetric efficiency and trapping pressure are compared with experimental values from a high-specific-output engine and further amplified with theoretical/experimental comparisons of pressure-time histories taken in the exhaust, transfer, and inlet systems at several engine speeds. The theoretical derivation of unsteady gas dynamic cylinder to pipe boundary conditions is presented so that they become both economical of computer time and mathematically stable.
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Citation
Blair, G. and Cahoon, W., "A More Complete Analysis of Unsteady Gas Flow Through a High-Specific-Output Two-Cycle Engine," SAE Technical Paper 720156, 1972, https://doi.org/10.4271/720156.Also In
References
- Blair G. P. Johnston M. B. “Unsteady Flow Effects in Exhaust Systems of Naturally Aspirated, Crankcase Compression Two Cycle Internal Combustion Engines.” SAE Transactions 77 1968 paper 680594
- Blair G. P. Johnston M. B. “Simplified Design Criteria for Expansion Chambers for Two-Cycle Gasoline Engines.” SAE Transactions 79 1970 paper 700125
- Blair G. P. Arbuckle J. A. “Unsteady Flow in the Induction System of a Reciprocating Internal Combustion Engine.” SAE Transactions 79 1970 paper 700443
- Wallace F. J. Stuart-Mitchell R. W. “Wave Action Following the Sudden Release of Air through an Engine Port System.” Proc. I.M.E. 1B 1953 343
- Wallace F. J. Nassif M. H. “Air Flow in a Naturally Aspirated Two-Stroke Engine.” Proc. I.M.E. 168 1954 515
- Engine Test Code-Spark Ignition and Diesel SAE J816. SAE Handbook
- Cahoon W. L. “Unsteady Gas Flow through a Naturally Aspirated Two-Stroke Internal Combustion Engine.” November 1971
- Rudinger G. “Wave Diagrams for Non-steady Flow in Ducts.” Princeton, N. J. D. Van Nostrand Co. 1955
- Blair G. P. Goulburn J. R. “The Pressure-Time History in the Exhaust System of a High-Speed Reciprocating Internal Combustion Engine.” SAE Transactions 76 paper 670477