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Models for Heat Transfer, Mixing and Hydrocarbon Oxidation in a Exhaust Port of a Spark-Ignited Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1980 by SAE International in United States
Annotation ability available
The fate of hydrocarbon species in the exhaust systems of spark-ignition engines is an important part of the overall hydrocarbon emissions problem. In this investigation models were developed for the instantaneous heat transfer, fluid mixing, and hydrocarbon oxidation in an engine exhaust port. Experimental measurements were obtained for the instantaneous cylinder pressure and instantaneous gas temperature at the exhaust port exit for a range of engine operating conditions. These measurements were used to validate the heat transfer model and to provide data on the instantaneous cylinder gas state for a series of illustrative exhaust port hydrocarbon oxidation computations as a function of engine operating and design variables.
During much of the exhaust process, the exhaust port heat transfer was dominated by large-scale fluid motion generated by the jet-like flow at the exhaust valve. A correlation based on the jet velocity through the valve opening was developed which correctly estimated the heat transfer due to this large-scale motion. A four-period heat transfer correlation for the complete exhaust process was then formulated, based on two distinct flow regimes, which provided good agreement with the measurements.
For individual variations of the engine operating conditions, computed reductions in hydrocarbon levels due to oxidation in the exhaust port ranged between 9 and 38%. The effect of the operating conditions was governed primarily by the resultant variations in exhaust gas temperatures and port residence times. Variations in specific design parameters, such as exhaust port geometry and internal port insulation, changed the overall degree of hydrocarbon oxidation in the exhaust port.
CitationCaton, J. and Heywood, J., "Models for Heat Transfer, Mixing and Hydrocarbon Oxidation in a Exhaust Port of a Spark-Ignited Engine," SAE Technical Paper 800290, 1980, https://doi.org/10.4271/800290.
- Heywood J. B. “Pollutant Formation and Control in Spark-Ignition Engines,” Progress in Energy and Combustion Science 1 1976 135 164
- Daniel W. A. “Flame Quenching at the Walls of an Internal Combustion Engine,” Sixth Symposium (International) on Combustion Reinhold Publishing Corp 1957 886 894
- Heywood J. B. Higgins J. M. Watts P. A. Tabaczynski R. J. “Development and Use of a Cycle Simulation to Predict SI Engine Efficiency and NO x Emissions,” SAE Paper 790291 February 1979
- Caton J. A. “Heat Transfer, Mixing and Hydrocarbon Oxidation in an Engine Exhaust Port,” September 1979
- Rohsenow W. M. Choi H. Y. “Heat, Mass and Momentum Transfer,” Prentice Hall, Inc. 1961
- Tanka K. “Airflow Through Exhaust Valve Conical Seat,” Proceedings of Third International Congress for Applied Mechanics 1 1931 287 295
- Annand W. J. D. Roe G. E. “Gas Flow in the Internal Combustion Engine,” G. T. Foulis & Co., Ltd. June 1974
- Arpaci V. S. “Conduction Heat Transfer,” Addison-Wesley Publishing Company 1966
- Hires S. D. Ekchian A. Heywood J. B. Tabaczynski R. J. Wall J. C. “Performance and NOx Emissions Modeling of a Jet Ignition Prechamber Stratified Charge Engine,” SAE Paper 760161 February 1976
- Spindt R. S. “Air-Fuel Ratios from Exhaust Gas Analysis,” SAE Transactions 74 650507 1965
- Martin M. K. Heywood J. B. “Approximate Relationships for the Thermodynamic Properties of Hydrocarbon-Air Combustion Products,” Combustion Science and Technology 15 1977 1 10
- Woschni G. “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” SAE Transaction 76 670931 1968 3065 3083
- Sherman R. H. Blumberg P. N. “The Influence of Induction and Exhaust Processes on Emissions and Fuel Consumption in the Spark Ignited Engine,” SAE Paper 770990 September 1977
- Lord H. A. Sondreal E. A. Kadlec R. H. Patterson D. J. “Reactor Studies for Exhaust Oxidation Rates,” SAE Paper 730203 1973
- Bascunana J. L. Skibinski J. Weaver E. E. “Rates of Exhaust Gas-Air Reactions,” SAE Paper 770639 June 1977
- Sigworth, H. W. Jr. Myers P. S. Uyehara O. A. “The Disappearance of Ethylene, Propylene, n-Butane, and 1-Butene in Spark-Ignition Engine Exhaust,” SAE Paper 700472 May 1970
- Sorenson S. C. Myers P. S. Uyehara O. A. “The Reaction of Ethane in Spark Ignition Engine Exhaust Gas,” SAE Paper 700471 May 1970
- Weaver E. E. Ninomiya J. S. Skewes L. M. Ruof C. H. “Oxidation of Gaseous Hydrocarbons in Concentrations of Parts per Million in Flow Systems,” Environment Science and Technology 3 January 1969 57 66
- Lavoie G. A. “Correlations of Combustion Data for S. I. Engine Calculations--Laminar Flame Speed, Quench Distance and Global Reaction Rates,” SAE Paper 780229 February 1978
- Daniel W. A. Wentworth J. T. “Exhaust Gas Hydrocarbons--Genesis and Exodus,” SAE Paper 486b March 1962
- Tabaczynski R. J. Heywood J. B. Keck J. C. “Time Resolved Measurements of Hydrocarbon Mass Flowrate in the Exhaust of a Spark-Ignition Engine,” SAE Paper 720112 January 1972
- Ekchian A. Heywood J. B. Rife J. M. “Time Resolved Measurements of the Exhaust from a Jet Ignition Prechamber Stratified Charge Engine,” SAE Paper 770043 February 1977
- Lavoie G. A. Blumberg P. N. “A Fundamental Model for Predicting Fuel Consumption, NOx and HC Emissions of the Conventional Spark-Ignited Engine,” 1979
- Lavoie G. A. LoRusso J. A. Admczyk A. A. “Hydrocarbon Emissions Modeling for Spark Ignition Engines,” Combustion Modeling in Reciprocating Engines: Proceedings of Symposium at GM Research Laboratories November 1978
- Huls T. A. Myers P. S. Uyehara O. A. “Spark Ignition Engine Operation and Design for Minimum Exhaust Emission,” SAE Paper 660405 June 1966
- Daniel W. A. “Engine Variable Effects on Exhaust Hydrocarbon Composition (A Single-Cylinder Engine Study with Propane as the Fuel),” SAE Paper 670124 January 1967
- Wentworth J. T. “Piston and Ring Variables Affect Exhaust Hydrocarbon Emissions,” SAE Paper 680109 January 1968
- Daniel W. A. “Why Engine Variables Affect Exhaust Hydrocarbon Emission,” SAE Paper 700109 January 1970
- Wentworth J. T. “Effect of Combustion Chamber Surface Temperature on Exhaust Hydrocarbon Concentration,” SAE Paper 710587 1971
- Haskell W. W. Legate C. E. “Exhaust Hydrocarbon Emissions from Gasoline Engines--Surface Phenomena,” SAE Paper 720255 January 1972
- Wentworth J. T. “More on the Origins of Exhaust Hydrocarbons Effects on Zero Oil Consumption, Deposit Location and Surface Roughness,” SAE Transactions 81 720939 1972