This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
A Feedgas HC Emission Model for SI Engines Including Partial Burn Effects
Annotation ability available
Sector:
Language:
English
Abstract
A model is presented which incorporates the key mechanisms in the formation and reduction of unburned HC emissions from spark ignited engines. The model includes the effects of piston crevice volume, oil layer absorption / desorption, partial burns, and in-cylinder and exhaust port oxidation. The mechanism for the filling and emptying of the piston crevice takes into account the location of the flame front so that the flow of both burned gas and unburned gas is recognized. Oxidation of unburned fuel is calculated with a global, Arrhenius-type equation.
A newly developed submodel is included which calculates the amount of unburned fuel to be added to the cylinder as a result of partial burns. At each crankangle, the submodel compares the rate of change of the burned gas volume to the rate of change of the cylinder volume. If this ratio reaches a critical value during combustion, the mass fraction unburned at that time is used to quantify the amount of unburned fuel due to partial burns.
The model is calibrated to engine data for two different engines and reasonable agreement is obtained as a function of engine speed, load, air-fuel ratio, EGR rate and spark timing. Results of a parametric study are presented which show the effect of several combustion chamber design variables on HC emissions. These variables include bore-to-stroke ratio, displacement per cylinder, compression ratio and crevice volume per unit displacement. The model predictions indicate that bore-to-stroke ratio has little effect on HC emissions while decreasing displacement per cylinder leads to increased HC emissions and increasing both compression ratio and crevice volume per unit displacement lead to increased HC emissions.
Recommended Content
Authors
Topic
Citation
Trinker, F., Cheng, J., and Davis, G., "A Feedgas HC Emission Model for SI Engines Including Partial Burn Effects," SAE Technical Paper 932705, 1993, https://doi.org/10.4271/932705.Also In
References
- “Piston and Ring Variables Affect Exhaust Hydrocarbon Emission,” Wentworth J. T. SAE Paper 680109 1968
- “Exhaust Hydrocarbon Emissions form Gasoline Engines - Surface Phenomena,” Haskell W. W. Legate C. E. SAE Paper 720255 1972
- “The Effect of Oil Layers on the Hydrocarbon Emissions from Spark-ignited Engines,” Kaiser E. W. LoRusso J. A. Lavoie G. A. Adamczyk A. A. Combustion Science and Technology 28 69 1982
- “A Study of HC Emissions from a Spark Ignition Engine (The Influence of Fuel Absorbed int Cylinder Lubricating Oil Film),” Ishizawa S. Takagi Y. JSME International Journal 30 260 310 1987
- “Effects of Lubricating Oil on Hydrocarbon Emissions in an SI Engine,” Schramm J. Sorenson S. C. SAE Paper 890622 1989
- “The Effect of Fuel-Oil Solubility on Exhaust HC Emissions,” Trinker F. H. Anderson R. W. Henig Y. I. Siegl W. O. Kaiser E. W. SAE Paper 912349 1991
- “Hydrocarbon Emissions of SI Engines as Influenced by Fuel Absorption-Desorption in Oil Films,” Gatellier B. Trapy J. Herrier D. Quelin J. M. Galliot F. SAE Paper 92095 1992
- “More on Origins of Exhaust Hydrocarbons - Effects- of Zero Oil Consumption, Deposit Location and Surface Roughness,” Wentworth J. T. SAE Paper 720939 1972
- “Exhaust Gas Hydrocarbons - Genesis and Exodus,” Daniel W. A. Wentworth J. T. SAE Paper 486B 1962
- “Time Resolved Measurements of Hydrocarbon Mass Flowrate in the Exhaust of a Spark-Ignition Engine,” Tabaczynski R. J. Heywood J. B. Keck J. C. M. I. T. Fluid Mechanics Laboratory Publication Number 71-10 1971
- “Study on the Genesis of Hydrocarbons in the Combustion Chamber of a Gasoline Engine,” Goto K. Ichimiya T. Hirata T. Sato Y. JSAE Review 55 1980
- “Models for Heat Transfer, Mixing and Hydrocarbon Oxidation in a Exhaust Port of a Spark-Ignited Engine,” Caton J. A. Heywood J. B. SAE Paper 800290 1980
- “Hydrocarbon Oxidation in the Exhaust Port of a Spark Ignition Engine,” Mendillo J. V. Heywood J. B. SAE Paper 810019 1981
- “Engine HC Emissions Modeling: Partial Burn Effects,” Lavoie G. A. Adamczyk A. A. Kaiser E. W. Cooper J. W. Rothschild W. G. Combustion Science and Technology 49 99 1986
- “A Fundamental Model for Predicting Fuel Consumption, NOx and HC Emissions of the Conventional Spark-Ignited Engine,” Lavoie G. A. Blumberg P. N. Combustion Science and Technology 21 225 1980
- “Hydrocarbon Emissions Modeling for Spark Ignition Engines,” Lavoie G. A. LoRusso J. A. Adamczyk A. A. Combustion Modeling in Reciprocating Engines 409 1980
- “A Model for Hydrocarbon Emissions from SI Engines,” Schramm J. Sorenson S. C. SAE Paper 902169 1990
- “Predictions of In-Cylinder Velocity and Turbulent Intensity for an Open Chamber Cup-in-Piston Engine,” Borgnakke Davis G. C. Tabaczynski R. J. SAE Paper 810224 1981
- “Modeling the Effect of Swirl on Turbulence Intensity and Burn Rate in S. I. Engines and Comparison with Experiments,” Davis G. C. Mikulec A. Kent J. C. Tabaczynski R. J. SAE Paper 860325 1986
- “Comparison of Model Calculations and Experimental Measurements of the Bulk Flow Processes in a Motored Proco Engine,” Davis G. C. Kent J. C. SAE Paper 790290 1979
- The Effect of Inlet Velocity Distribution and Magnitude on In-Cylinder Turbulence Intensity and Burn Rate - Model Versus Experiment,” Davis G. C. Tabaczynski R. J. Journal of Engineering for Gas Turbines and Power 110 509 1988
- “Effect of Cylinder Distortions and Piston Ring Design on Oil Consumption and Friction Losses in Automobile Engines,” Brombolich L. J. DOE Report DE-AC02-86CE-90236 U. S. Department of Energy, Office of Energy Systems Research, ECUT Division 1988
- “Flow in the Piston-Cylinder-Ring Crevices of a Spark-Ignition Engine: Effect on Hydrocarbon Emissions, Efficiency and Power,” Namazian M. Heywood J. B. SAE Paper 820088 1982
- “Calculation of Flow in the Piston-Cylinder-Ring Crevices of a Homogeneous-Charge Engine and Comparison with Experiment,” Kuo T. W. Sellnau M. C. Theobald M. A. Jones J. D. SAE Paper 890838 1989
- “Modeling of HC Emissions Due to Crevice Flows in Premixed-Charge Engines,” Reitz R. D. Kuo T. W. SAE Paper 892085 1989
- “Effect of Combustion Chamber Shape and Spark Location on Exhaust Nitric Oxide and Hydrocarbon Emissions,” Wentworth J. T. SAE Paper 740529 1974
- “Cyclic Absorption/Desorption of Gas in a Liquid Wall Film,” Carrier G. Fendell F. Feldman P. Combustion Science and Technology 25 9 1981
- “A Model for Absorption and Desorption of Fuel Vapour by Cylinder Lubricating Oil Films and Its Contribution to Hydrocarbon Emissions,” Dent J. C. Lakshminarayanan P. A. SAE Paper 830652 1983
- “Effects of Fuel Absorbed in Oil Film on Unburnt Hydrocarbon Emissions from Spark Ignition Engines (Numerical Model of Dynamic Process of Fuel Absorption and Desorption),” Korematsu K. JSME International Journal 33 3 606 1990
- Heat Transfer Gebhart B. McGraw-Hill Book Company 94 102 486 496 1971
- “Correlation of Diffusion Coefficients in Dilute Solutions,” Wilke C. R. Chang P. A.I.Ch.E. Journal 1 264 1955
- Motor Oils and Engine Lubrication Schilling A. Scientific Publications (GB) Ltd 1968
- “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” Woschni G. SAE Paper 670931 1967
- “Correlations of Combustion Data for S. I. Engine Calculations - Laminar Flame Speed, Quench Distance and Global Reaction Rates,” Lavoie G. A. SAE Paper 780229 1979
- “Engine Combustion at Large Bore-to-Stroke Ratios,” Siewert R. M. SAE Paper 780968
- “Combustion Concept for Low Emission and Better Fuel Economy in an S. I. Engine,” Takagi Y. Fourth International Academic Seminar 1991