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Investigation of the Fuel Distribution in a Two-Stroke Engine with an Air-Assisted Injector
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Abstract
Results of experiments performed on a direct-injection two-stroke engine using an air-assisted injector are presented. Pressure measurements in both the engine cylinder and injector body coupled with backlit photographs of the spray provide a qualitative understanding of the spray dynamics from the oscillating poppet system. The temporal evolution of the spatial distribution of both liquid and vapor fuel were measured within the cylinder using the Exciplex technique with a new dopant which is suitable for tracing gasoline. However, a temperature dependence of the vapor phase fluorescence was found that limits the direct quantitative interpretation of the images. Investigation of a number of realizations of the vapor field at a time typical of ignition for a stratified-charge engine shows a high degree of cycle to cycle variability with some cycles exhibiting a high level of charge stratification. Laser diffraction droplet sizing was performed in the motoring engine and shows that the air-assist injector produces a very finely atomized spray under conditions of early injection when the ratio of injector pressure to cylinder pressure is high. However, when the air rail pressure was decreased larger drop sizes were observed.
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Citation
Ghandhi, J., Felton, P., Gajdeczko, B., and Bracco, F., "Investigation of the Fuel Distribution in a Two-Stroke Engine with an Air-Assisted Injector," SAE Technical Paper 940394, 1994, https://doi.org/10.4271/940394.Also In
Two-Stroke Engines: Theoretical and Experimental Investigations
Number: SP-1019; Published: 1994-03-01
Number: SP-1019; Published: 1994-03-01
References
- Witze, P.O. Vilchis, F.R. “Stroboscopic Laser Shadowgraph Study of the Effect of Swirl on Homogeneous Combustion in a Spark Ignition Engine,” SAE Paper 810226 1981
- Shiozaki, T. Suzuki, T. Shimoda, M. “Observations of Combustion Process in D.I. Engines via High Speed Direct and Schlieren Photography,” SAE Paper 800025 , Diesel Combustion and Emissions, Proceedings 1980
- Felton, P.G. Mantzaras, J. Bardsley, M.E.A. Bracco, F.V. “2-D Visualization of Liquid Fuel Injection in an Internal Combution Engine,” SAE Paper 872074 1987
- Bardsley, M.E.A. Felton, P.G. Bracco, F.V. “2-D Visualization of Liquid and Vapor Fuel in an I.C. Engine,” SAE Paper 880521 1988
- Felton, P.G. Bardsley, M.E.A. Bracco, F.V. “On the Quantitative Application of Exciplex Fluorescence to Engine Sprays,” SAE Paper 930870 1993
- Baritaud, T.A. Heinze, T.A. “Gasoline Distribution Measurements with PLIF in a SI Engine,” SAE Paper 922355 1992
- Lawrenz, W. Kohler, J. Meier, F. Stolz, W. Wirth, R. Bloss, W.H. Maly, R.R. Wagner, E. Zahn, M. “Quantitative 2D LIF Measurements of Air/Fuel Ratios During the Intake Stroke in a Transparent SI Engine,” SAE Paper 922320 1992
- 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
- Schechter. M.M. Levin, M.B. “Air-Forced Fuel Injection System for 2-Stróke 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 1990
- MacInnes, J.M. Bracco, F.V. “Computation of the Spray from an Air-Assisted Fuel Injector,” SAE Paper 902079 1990
- Emerson, J.R. “Characterization of an Air-Assisted Fuel Injector,” M.A.E. Dept., Princeton University November 1989
- Lancaster, D.R. Krieger, R.B. Linesch, J.H. “Measurement and Ananlysis of Engine Pressure Data,” SAE Paper 750026 1975
- Takagi, T. “Computations and Analysis of Transient Hollow Cone Sprays,” M.A.E. Dept., Princeton University June 1985
- Melton, L.A. “Spectrally Separated Fluorescence Emissions for Diesel Fuel Droplets and Vapor,” Applied Optics 22 2224 6 1983
- Melton, L.A. “Exciplex-Based Vapor/Liquid Visualization Systems Appropriate for Automotive Gasolines,” Texas Higher Education Coordinating Board November 1990
- Wang, C.H. Law, C.K. “Microexplosion of Fuel Droplets under High Pressure,” Comb. Flame 59 533 1985
- Bardsley, M.E.A. “Two Dimensional Visualization of Fuel Sprays in an Internal Combustion Engine,” M.A.E. Dept., Princetion University June 1990
- Frigo, S. “Evaluation of Fluorescing Tracers for Hexane and Isooctane,” M.A.E. Dept., Princeton University 1993
- Abraham, J. Bracco, F.V. “Combustion Optimization Computations - Part I: Swirl and Squish Effects in Air-Assist Injection Engines,” SAE Paper 922240 1992
- Felton, P.G. “A Review of the Fraunhofer Diffraction Particle-Sizing Technique,” Liquid Particle Size Measurement Techniques: 2nd Volume, ASTM STP 1083 Dan Hirleman E. Bachalo W.D. Felton Philip G. American Society for Testing and Materials Philadelphia 1990 47 59
- Law, C.K. Recent Advances in Droplet Vaporization and Combustion,” Prog. Energy Combust. Sci. 8 171 201