This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Mixture Preparation Effects on Ignition and Combustion in a Direct-Injection Spark-Ignition Engine
Annotation ability available
Sector:
Language:
English
Abstract
Planar instantaneous fuel concentration measurements were made by laser-induced fluorescence of 3-pentanone in the spark gap just prior to ignition in a direct-injection spark-ignition engine operating at a light load, highly stratified condition. The distribution of the average equivalence ratio in a circle of 1.9 mm diameter centered on the spark plug showed that a large fraction of the cycles had an equivalence ratio below the lean limit, yet acceptable combustion was achieved in those cycles. Further, weak correlation was found between the local average equivalence ratio near the spark plug and the time required to achieved a 100 kPa pressure rise above the motoring pressure, as well as other parameters which characterize the early stages of combustion. The cause for this behavior is assessed to be mixture motion during the spark discharge which continually convects fresh mixture through the spark gap during breakdown. Such high mixture motion is inherent in direct injection systems because of the requirements placed on mixing for full load operation, and the influence of the spray on the flowfield for light load conditions where the injection and ignition event may overlap. The implication is that good ignition of stratified charges is not necessarily a main difficulty, particularly if engine development includes detailed in-cylinder measurements.
Citation
Ghandhi, J. and Bracco, F., "Mixture Preparation Effects on Ignition and Combustion in a Direct-Injection Spark-Ignition Engine," SAE Technical Paper 962013, 1996, https://doi.org/10.4271/962013.Also In
References
- Kume, T. lwamoto, Y. lida, K. Murakami, M. Akishino, K. Ando, H. “Combustion Control Technologies for Direct Injection SI Engine,” SAE Paper 960600 1996
- Fraidl, G. K. Piock, W. F. Wirth, M. “Gasoline Direct Injection: Actual Trends and Future Strategies for Injection and Combustion Systems,” SAE Paper 960465
- Fansler, T. D. French, D. T. Drake, M. C. “Fuel Distribution in a Firing Direct-Injection Spark-Ignition Engine Using Laser-Induces Fluorescence Imaging,” SAE Paper 950110 1995
- Ricardo, H. R. “Recent Work on the Internal Combustion Engine,” SAE Journal 10 1922
- Barber, E. M. Malin, J. B. Mikita, J. J. “The Elimination of Combustion Knock,” J. Franklin Inst. 241 4 1946
- Scussel, A. J. Simko, A. O. Wade, W. R. “The Ford PROCO Engine Update,” SAE Paper 780699 1978
- Houston, R. Archer, M. Moore, M. Newmann, R. “Development of a Durable Emissions Control System for an Automotive Two-Stroke Engine,” SAE Paper 960361 1996
- Ghandhi, J. B. Felton, P. G. Gajdeczko, B. F. Bracco, F. V. “Investigation of the Fuel Distribution in a Two-Stroke Engine with an Air-Assisted Injector,” SAE Paper 940394 1994
- Ghandhi, J. B. Bracco, F. V. “Fuel Distribution Effects on the Combustion of a Direct-Injection Stratified-Charge Engine,” SAE Paper 950460 1995
- Hall, M. J. “A Study of Velocities and Turbulence Intensities Measured in Firing and Motored Engines,” M.A.E. Dept., Princeton University November 1987
- Iijima, T Bracco, F. V. “LDV Measurements in an Engine with Square and Circular Piston Cups,” SAE Paper 872073 1987
- Lancaster, D.R. Krieger, R.B. Linesch, J.H. “Measurement and Analysis of Engine Pressure Data,” SAE Paper 750026 1975
- Brown, W. L. “Methods for Evaluating Requirements and Errors in Cylinder Pressure Measurement,” SAE Paper 670008 1967
- Schechter. M. M. Levin, M. B. “Air-Forced Fuel Injection System for 2-Stroke D.I. Gasoline Engine,” SAE Paper 910664 1991
- Emerson, J. Felton, P. G. Bracco, F. V. “Structure of Sprays from Fuel Injectors Part III: The Ford Air-Assisted Fuel Injector,” SAE Paper 900478
- MacInnes, J. M. Bracco, F. V. “Computation of the Spray from an Air-Assisted Fuel Injector,” SAE Paper 902079 1990
- Hansen, D. A. Lee, E. K. C. “Radiative and Nonradiative Transitions in the First Excited Singlet State of Symmetrical Methyl-Substituted Acetones,” Journal of Chemical Physics 62 1 183 188 1975
- Ghandhi, J. B. “Fuel Distribution Measurements in a Direct-Injection Stratified-Charge Engine,” M. A. E. Dept., Princeton University June 1995
- Felton, P.G. Bardsley, M.E.A. Bracco, F.V. “On the Quantitative Application of Exciplex Fluorescence to Engine Sprays,” SAE Paper 930870 1993
- Ghandhi, J. B. Felton, P. G. “On the Fluorescent Behavior of Ketones at High Temperatures,” Experiments in Fluids 21 143 144 1996
- Matekunas, F. A. “Modes and Measures of Cyclic Combustion Variability,” SAE Paper 830337 1983
- Young, M. B. “Cyclic Dispersion in the Homogeneous-Charge Spark-Ignition Engine - A Literature Survey,” SAE Paper 810020 1981
- Ozdor, N. Dulger, M. Sher, E. “Cyclic Variability in Spark Ignition Engines - A Literature Survey SAE Paper 940987 1994
- Gatowski, J. A. Balles, E. N. Chun, K. M. Nelson, F. E. Eckchian, J. A. Heywood, J. B. “Heat Release Analysis of Engine Pressure Data,” SAE Paper 841359 1984
- Foster, D. E. “An Overview of Zero-Dimensional Thermodynamic Models for IC Engine Data Analysis,” SAE Paper 852070 1985
- Fraser, R. A. Bracco, F. V. “Cycle-Resolved LDV Integral Length Scale Measurements in an I. C. Engine,” SAE Paper 880381 1988
- Neij, H. Johansson, B. Alden, M. “Development and Demonstration of 2D-LIF for Studies of Mixture Preparation in SI Engines,” Combustion and Flame 99 449 457 1994
- Johansson, B. Neij, H. Alden, M. Juhlin, G. “Investigations of the Influence of Mixture Preparation on Cyclic Variations in a SI-Engine Using Laser-Induced Fluorescence,” SAE Paper 950108 1995
- Lee, K-H Foster, D. E. “Cycle-by-Cycle Variations in Combustion and Mixture Concentration in the Vicinity of the Spark Plug Gap,” SAE Paper 950814 1995