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Performance and NO x Model of a Direct Injection Stratified Charge Engine
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Abstract
A model has been developed to predict the performance and NOx emission of the Texaco stratified charge engine. This complete engine cycle program starts from engine geometry, valve and fuel injection timing, fuel characteristics and operating conditions and includes the following phases: valve overlap, intake, compression, combustion, expansion and exhaust.
The fuel mixing process is described by a jet mixing model and the equations are solved in a cylindrical coordinate system with a nonuniform pressure field. The jet shape changes were calculated for the jet impingement effect against a solid wall. The air motion inside the cylinder is determined by a detailed submodel to specify the field for the fuel jet.
During combustion, the fuel jet is divided into many elements and the combustion process of each element is analyzed as a mixing process between the jet and surrounding air, entrainment into a flame front and subsequent combustion.
For heat transfer the walls of the combustion chamber are divided into five regions; intake valve, exhaust valve, cylinder head, cylinder wall and piston top. Each region is assumed to have a different temperature and different gas velocity.
Nitric oxide emissions are calculated by using the extended Zel’dovich kinetic mechanism with a steady state assumption for the N concentration and equilibrium values used for H, O, O2 and OH concentrations.
The model computes combustion rates, heat transfer and NOx based on the same jet mixing processes at each stage.
Comparison of the model predictions with the available experimental data shows reasonably good agreement.
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Hiraki, H. and Rife, J., "Performance and NOx Model of a Direct Injection Stratified Charge Engine," SAE Technical Paper 800050, 1980, https://doi.org/10.4271/800050.Also In
References
- Davis et. al. “Fuel Injection and Positive Ignition-- A Basis for Improved Efficiency and Economy” Paper 190A presented at SAE Summer Meeting, Chicago June 1960
- Mitchell et. al. “Design and Evaluation of a Stratified Charge Multifuel Military Engine,” SAE Transactions 77 1968 Paper 680042
- Mitchell et. al “A Stratified Charge Multifuel Military Engine -- A Progress Report,” SAE Paper Paper 720051
- Alperstein et. al. “Texaco’s Stratified Charge Engine -- Multifuel, Efficient, Clean and Practical,” SAE Paper 740563
- Canup, R.E. “The Texaco Ignition System A New Concept for Automotive Engines,” SAE Paper 750347
- Lyn, W.T. “Study of the Burning Rate and Nature of Combustion in Diesel Engines,” IX International Symposium on Combustion 1962
- Shahed, S.M. et. al. “A Preliminary Model for the Formation of Nitric Oxide in Direct Injection Diesel Engines and It’s Application in Parametric Studies,” SAE Paper 730083
- Komiyama, K. Heywood, J.B. “Predicting NO x Emissions and Effects of Exhaust Gas Recirculation in Spark-Ignition Engines,” SAE Paper 730475
- Higgins, J. “performance and Emission Parameter Study of a Conventional Spark Ignition Engine M.E., MIT 1976
- Shipinski, J. H. et. al. “A Spray -- Drop-let Model for Diesel Combustion,” 28 35 Symposium on Diesel Engine Combustion, Institution of Mechanical Engineers 1970
- Whitehouse, N.D. et. al. “A Simple Method for the Calculation of Heat Release Rates in Direct Engines Based on the Fuel Injection Rate,” SAE Paper 710134
- Bracco, F. V. et. al. “Two Phase, Two-Dimensional, Unsteady Combustion in Internal Combustion Engines; Theoretical-Experimental Results,” SAE Paper 760114
- Adler, D. Lyn, W. T. “The Evaporation and Mixing of a Liquid Fuel Spray in a Diesel Engine Combustion,” Institution of Mechanical Engineers 1970
- Rife, J. M. Heywood, J. B. “Photographic and Performance Studies of Diesel Combustion with a Rapid Compression Machine,” SAE Paper 740948
- Hiroyasu, H. et. al. “Models for Combustion and Formation of Nitric Oxide and Soot in Direct Injection Diesel Engines,” SAE Paper 760129
- Chiu, W.S. et. al. “A Transient Spray Mixing Model for Diesel Combustion,” SAE Paper 760128
- Pompei, F. “The Role of Mixing in Burner Generated Carbon Monoxide and Nitric Oxide,” M.E., MIT 1972
- Flagan, R.C. “The Formation of Nitric Oxide from Organic Nitrogen Contained in Fossil Fuels,” M.E., MIT 1973
- Jain, B. C. et. al. “A Performance Model for the Texaco Controlled Combustion, Stratified Charge Engine,” SAE Paper 760116
- Woschni, G. “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” Paper 670931 of SAE Transactions, 76, 30653083 1968
- Martin, M. K. “Photographic Study of Stratified Combustion Using a Rapid Compression Machine,” MIT 1975
- Borman, G.L. “Mathematical Simulation of Internal Combustion Engine Processes and Performance Including Comparisons with Experiment,” M.E., U. of Wisconsin Madison 1964
- Hoult, D.P. Weil, W.C. “Turbulent Plume in a Laminar Cross Flow,” Atmospheric Environment 6 1972 514 531
- Ricou, J.P. Spalding, D.B. “Measurement of Entrainment by Axial Symmetric Turbulent Jets,” J. Fluid Mech. 9 21 1961
- Escudier, M.P. “Aerodynamics of a Burning Turbulent Gas Jet in a Cross Flow,” Combustion Science and Technology April 1972
- Wong, V. W. “A Photographic and Performance Study of Stratified Combustion Using a Rapid Compression Machine,” 68 70 91 94 M.E., MIT 1976
- Marsh, G.C. “A Detailed Performance Comparison of Distillate Fuels in the Texaco Stratified Charge Engine,” M.E., MIT 1976
- Blizard, N. Keck, J.C. “Experimental and Theoretical Investigation of Turbulent Burning Model for Internal Combustion Engines,” SAE Paper 740191
- Tabaczynski, R. et. al. “A Turbulent Entrainment Model for Spark-Ignition Engine Combustion,” SAE Paper 770647
- Dent, J. Salama, N. “The Measurement of the Turbulence Characteristics in an Internal Combustion Engine Cylinder,” SAE Paper 750886
- Beer, J.M. Chigier, N.A. “Combustion Aerodynamics,” John Willey and Sons 1972
- Lavoie, G.A. et. al “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines,” 313 326 Combustion Science and Technology 1 1970
- Fly, G.W. “Parametric Study of the Impact of Mixing Rates on the Formation of NO x in a TCCS Engine,” M.E., MIT 1977
- Bastress, E.K. et. al. “Control of Nitrogen Oxide Emissions from Diesel Engines: A Theoretical Analysis,” June 8 1971
- Bishop, I.N. “Effect of Design Variables on Friction and Economy,” SAE Automotive Engineering Congress Jan. 13–17 1964
- Hires, S.D., et al “Performance and NO x Emissions Modeling of a Jet Ignition Pre-chamber Stratified Charge Engine,” SAE Paper 760161
- JANAF Thermochemical Tables 1971