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Mixture Turbulence - A Key to Cyclic Combustion Variation
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Abstract
Cyclic combustion variations were studied in a single-cylinder CFR engine with a pancake combustion chamber. Variations in the combustion duration were shown to be related to mixture velocity and its variations through a simple model. This model postulates a critical flame radius increment in which mixture motion variations near the spark electrodes create the cyclic combustion variations. From experimental measurements, the critical flame radius increment in this engine was found to be about 0.4 in.
The mixture motion measurements were made with a hot-wire anemometer in the engine motored without fuel. A new calibration and calculation technique was developed in order to obtain velocities from the anemometer output in the varying temperature and pressure environment of the engine. Tests were run at full and part load over the speed range of 500-1500 rpm. It was found that near tdc the turbulence in the engine was isotropic and the turbulent velocity increased linearly with engine speed.
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Winsor, R. and Patterson, D., "Mixture Turbulence - A Key to Cyclic Combustion Variation," SAE Technical Paper 730086, 1973, https://doi.org/10.4271/730086.Also In
References
- Robison J. A. Brehob W. M. “The Influence of Improved Mixture Quality on Engine Exhaust Emissions and Performance.” Jrl. Air Pollution Control Assoc. 17 7 July 1967 446
- Burgett R. Leptich J. Sangwan K. “Measuring the Effect of Spark Plug and Ignition System Design on Engine Performance.” Paper 720007 SAE Automotive Engineering Congress Detroit January 1972
- Averette H. S. “A Study of Peak Pressure Variations in the Otto Cycle Engine.” M.I.T. 1964
- Broeze J. J. “Combustion in Internal Combustion Engines. II. The Spark Ignition Engine.” Engineering 169 April 1950 464
- Rothrock A. M. Spencer R. C. “The Influence of Directed Air Flow on Combustion in a Spark-Ignition Engine.” NACA Report 657 1939
- Karim G. A. “An Examination of the Nature of the Random Cyclic Pressure Variations in a Spark-Ignition Engine.” Jrl. Inst. Pet. 53 519 March 1967 112
- Soltau J. P. “Cylinder Pressure Variations in Petrol Engines.” Proceedings of the Institution of Mechanical Engineers 2 1960-1961 99
- Vichnievsky R. “Combustion in Petrol Engines “Proceedings of the Joint Conference on Combustion-IME ASME October 1955 288
- Starkman E. S. Strange F. M. Dahm T. J. “Flame Speeds and Pressure Rise Rates in Spark Ignition Engines.” Paper 83V SAE West Coast Meeting Vancouver August 1959
- Curry Shelley “A Three-Dimensional Study of Flame Propagation in a Spark Ignition Engine.” SAE Transactions 71 1963
- Patterson D. J. “Cylinder Pressure Variations, A Fundamental Combustion Problem SAE Transactions 75 1967 paper 660129
- Semenov E. S. “Studies of Turbulent Gas Flow in Piston Engines.” NASA Technical Translation F-97 1963
- Barton R. K. Lestz S. S. Meyer W. E. “An Empirical Model for Correlation Cycle-by-Cycle Cylinder Gas Motion and Combustion Variations of an SI Engine.” SAE Transactions 80 1971 paper 710163
- Matsuoka S. Yamaguchi T. Umemura Y. “Factors Influencing the Cyclic Variation of Combustion of Spark Ignition Engine.” Paper 710586 SAE Mid-Year Meeting Montreal June 1971
- Collis D. C. Williams N. J. “Two-Dimensional Convection from Heated Wires at Low Reynolds Numbers.” Jrl. Fluid Mech. 6 3 1959 357
- “DISA Instruction and Service Manual for Type 55005 Battery-Operated CTA.” DISA Electronics Midland Park, N.J.
- Winsor R. E. “Relationship of Cyclic Combustion Variations and Mixture Motion in a Spark-Ignition Engine.” University of Michigan August 1972
- Duncan A. J. “Quality Control and Industrial Statistics.” Homewood, Illinois Richard D. Irwin, Inc. 1959
- Bouchard C. L. Taylor C. F. Taylor E. S. “Variables Affecting Flame Speed in the Otto Cycle Engine.” SAE Journal 41 December 1937
- Cole D. E. Mirsky W. “Mixture Motion-Its Effect on Pressure Rise in a Combustion Bomb: A New Look at Cyclic Variation.” SAE Transactions 77 1968 paper 680766
- “Basic Considerations in the Combustion of Hydrocarbon Fuels with Air.” NACA Report 1300 1957 357
- Daniel Wayne A. “Why Engine Variables Affect Exhaust Hydrocarbon Emission.” SAE Transactions 79 1970 paper 700108
- Grant H. P. Kronauer R. E. “Fundamentals of Hot Wire Anemometry.” ASME Hydraulic Division Conference May 1962
- Flow Corporation Bulletin 53 Flow Corp. 205 Sixth St., Cambridge, Mass.
- Hinze J. O. “Turbulence.” New York McGraw-Hill Book Co., Inc. 1959
- Batchelor G. E. “The Theory of Homogeneous Turbulence.” Cambridge University Press 1959
- “Perry's Chemical Engineer's Handbook.” New York McGraw-Hill Book Co., Inc. 4th 1963