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An Improved Model for Predicting Reed Valve Behaviour in Two-Stroke Cycle Engines
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English
Abstract
Previous publications from The Queen's University of Belfast have shown the formulation of a mathematical model to simulate the dynamic behaviour of a reed valve as used between the crankcase and inlet tract of a simple two-stroke cycle engine. This paper describes the enhancements and improvements made to this original reed valve model and its verification by correlation with measurements from a firing engine. Measured and predicted data for reed tip lift and delivery ratio are presented for a 350cm3, twin cylinder test engine over a wide range of engine speeds up to 9500 rev/min. The results of this experimental and theoretical study, using varied reed width profiles and radically different reed petal materials including carbon fibre, glass fibre reinforced plastics and steel, are also presented. The development of a new and unique reed valve visualisation technique is described and discussed both theoretically and practically. Therefore a more complete and wide ranging simulation of a two-stroke cycle engine fitted with a reed intake valve is now possible.
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Authors
- R. Fleck - Dept. of Mechanical and Manufacturing, Aeronautical and Chemical Engineering, The Queen's University of Belfast, N. Ireland
- G. P. Blair - Dept. of Mechanical and Manufacturing, Aeronautical and Chemical Engineering, The Queen's University of Belfast, N. Ireland
- R. A. R. Houston - Dept. of Mechanical and Manufacturing, Aeronautical and Chemical Engineering, The Queen's University of Belfast, N. Ireland
Topic
Citation
Fleck, R., Blair, G., and Houston, R., "An Improved Model for Predicting Reed Valve Behaviour in Two-Stroke Cycle Engines," SAE Technical Paper 871654, 1987, https://doi.org/10.4271/871654.Also In
SAE 1987 Transactions: Reciprocating Engines--Spark Ignition and Diesel
Number: V96-4; Published: 1988-09-01
Number: V96-4; Published: 1988-09-01
References
- Hinds E.T. Blair G.P. “Unsteady Gas Flow through Reed Valve Induction Systems” SAE Paper 780766 Sept 1978
- Blair G.P. Hinds E.T. Fleck R. “Predicting the performance characteristics of Two-Cycle Engines fitted with Reed Induction Valves” SAE Paper 790842 Sept 1979
- Kreiger R.B. Body R.R. Mayers P.S. Uyehara O.A. “Simulation of a Crankcase Scavenged, Two-Stroke, SI Engine and Comparisons with Experimental Data” SAE Paper 690135 Jan 1969
- Hata N. Fujita T. Matsuo N. “Modification of Two-Stroke Engine Intake System for Improvements of Fuel Consumption and Performance through the Yamaha Energy Induction System (YEIS)” SAE Paper 810923 Sept 1981
- Blair G.P. “Prediction of Two-Cycle Engine Performance Characteristics” SAE Paper 760645 Sept 1976
- Tse F.S. Morse I.E. Hinkle R.T. “Mechanical Vibrations, Theory and Applications” 2nd 288 295 Allyn and Bacon 1978
- Hinds E.T. “Intake Flow Characteristics of a Two-Stroke Cycle Engine fitted with Reed Valves” Doctoral thesis Dept of Mech Eng., The Queen's University of Belfast August 1978
- B.S. 1042 “Methods for the Measurement of Fluid Flow in Pipes” British Standards Institution 1966