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Predicting the Performance Characteristics of Two-Cycle Engines Fitted with Reed Induction Valves
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English
Abstract
Earlier papers by the principal author in conjunction with others have described the prediction of noise and performance characteristics of two-cycle spark-ignition crankcase compression engines. These calculations are performed on a digital computer and are shown to simulate accurately the unsteady gas flow and thermodynamic processes in such power units. The engines described previously had induction control by the piston or with a disc valve. In this paper the work is extended to engines fitted with reed valves controlling intake air flow and examples illustrating the effectiveness of such calculations are presented. In particular, a single-cylinder industrial engine is employed to show clearly the effects of changing such parameters as reed petal thickness, stop-plate radii and numbers of reed petals on the performance characteristics. The mathematical model is extended also to a twin-cylinder outboard marine engine and comparisons of measured and predicted performance behaviour are presented.
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Citation
Blair, G., Hinds, E., and Fleck, R., "Predicting the Performance Characteristics of Two-Cycle Engines Fitted with Reed Induction Valves," SAE Technical Paper 790842, 1979, https://doi.org/10.4271/790842.Also In
References
- Hinds E. T. Blair G. P. “Unsteady Gas Flow Through Reed Valve Induction Systems” SAE paper 780766 Sept. 1978
- Blair G. P. “Prediction of Two-Cycle Engine Performance Characteristics” SAE paper 760645 Sept. 1976
- Blair G. P. “A Theoretical Examination of Relevant Parameters for Dynamometer Testing of Two Cycle Engine Mufflers” EPA Surface Transportation Exhaust Noise Conference Chicago Oct. 11-13 1977
- Blair G. P. “Computer-Aided Design for Small Two-Stroke Engines for both Performance Characteristics and Noise Levels” I.Mech.E. Automobile Division Conference 51 69 Isle of Man June 1978
- Blair G. P. Cahoon W. L. “A More Complete Analysis of Unsteady Gas Flow Through a High-Specific Output Two-Cycle Engine” SAE paper 720156 Jan. 1972
- Blair G. P. “A Computer Program for the Prediction of Noise and Performance Characteristics of a Two-Cycle Engine” Department of Mechanical and Industrial Engineering The Queen's University of Belfast
- Blair G. P. Ashe M. C. “The Unsteady Gas Exchange Characteristics of a Two-Cycle Engine” SAE paper 760644 Sept. 1976