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Validation of Two-Stroke Engine Simulation by a Transient Test Method
Technical Paper
978510
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Language:
English
Abstract
A computer simulation of a high performance two-stroke engine has been validated by a transient test method. The simulation included unsteady gas dynamics, together with detailed mechanical models for the reed valve, etc. The combustion model used Vibe coefficients derived directly from measured cylinder pressures. Cylinder scavenging characteristics which were measured on The Queen's University of Belfast (QUB) single-cycle rig were also incorporated in the simulation.
Validation of the model involved use of an inertial dynamometer and data acquisition system which has been developed at QUB. This dynamometer incorporates a flywheel which is directly coupled to the engine. During a test, the engine is accelerated, and the torque and power are calculated from the flywheel speed characteristics. Further, at pre-determined engine speed intervals, the cylinder and exhaust pressures may be recorded. This testing system provided a convenient and rapid experimental method to acquire data.
Measurement of power, pressures and temperatures during transient testing are discussed. Also presented are methods which reduce the errors arising from the slow response of thermocouples. The measured results are compared with the computer predictions for power and exhaust pressure. Excellent correlation was achieved.
Authors
- Robert J Kee - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
- Paul T McEntee - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
- Gordon P Blair - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
- Thomas Fickenscher - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
- Jürgen Hölzer - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
- Roy Douglas - Department of Mechanical and Manufacturing Engineering The Queen's University of Belfast
Topic
Citation
Kee, R., McEntee, P., Blair, G., Fickenscher, T. et al., "Validation of Two-Stroke Engine Simulation by a Transient Test Method," SAE Technical Paper 978510, 1997.Also In
References
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- Beaumont A.J. , Noble A.D. and Pilley A.D. Signal Reconstruction Techniques for Improved Measurement of Transient Emissions SAE Paper No. 900233
- Bendix Karl-Heinz Optimizing of the nonsteady operational behaviour of high performance two-stroke engines SAE Paper No. 931509 , SETC Conference Pisa 1993
- Bendix Karl-Heinz Optimierung des Instationaren Betriebsverhaltens von Hochleistungszweitaktmotoren 5th International Two-Wheeler Symposium Technische Universität Graz Austria 1993
- Forney L.J. and Fralick G.C. Two wire thermocouple: Frequency response in constant flow Rev. Sci. Instrum. 65 10 October 1994
- Blair G.P. Design and Simulation of Two-Stroke Engines SAE Publication No. R-161 1-56091-685-0 1996 293
- Sweeney M.E.G. , Kenny R.G. , Swann G.B. and Blair G.P. Single Cycle Gas Testing Method for Two-Stroke Engine Scavenging SAE International Congress Detroit, Michigan February 1985 SAE Paper No. 850178