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Comparison of Two Injectors by LIF with Respect to Mixture Formation and Combustion Inside the Cylinder of a Transparent SI Engine
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Abstract
Two different types of fuel injectors - a plate-type two-jet injector and a full-cone single-jet injector - have been applied to a fired four-valve SI engine with optical access. While the two-jet injector is optimized for the employed engine, the single jet injector leads to fuel wall film deposition inside the intake. As a third variation, an already vaporized and ideally premixed fuel / air mixture was fed to the engine. The three different types of mixture formation initially generate different local air / fuel ratios inside the cylinder, but 30° CA before TDC the distributions seem to be equal and nearly homogeneous. Nevertheless, the combustion process is different and the exhaust gas composition indicates that differences must be present, which will be discussed.
Laser induced fluorescence (LIF) was used to compare the fuel vapor distributions and the fluctuations of the fuel concentration during intake and compression inside the cylinder. Flame propagation was studied and is different for each of the two injector types as well as for the prevaporized mixture. The fuel used was isooctane. Triethylamine (TEA) was taken as fluorescent marker of the fuel. Excitation of TEA was achieved by a KrF excimer laser at 248 nm. An intensified CCD camera was used for detection of the UV-signals.
Complementary to the optical investigations conventional exhaust gas analysis of unburnt hydrocarbons (UHC) and NOx emission was performed for the two injectors, and was correlated to the results of the optical measurements.
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Citation
Krämer, H., Münch, K., and Leipertz, A., "Comparison of Two Injectors by LIF with Respect to Mixture Formation and Combustion Inside the Cylinder of a Transparent SI Engine," SAE Technical Paper 972946, 1997, https://doi.org/10.4271/972946.Also In
References
- Kaiser E.W. Siegel W.O. Lawson G.P. Connolly F.T. Cramer C.F. Dobbins K.L. Roth P.W. Smokovitz M. “Effect of Fuel Preparation on Cold-Start Hydrocarbon Emissions from a Spark-Ignited Engine” SAE Paper 961957 1996
- Brehm C. Carabateas N. Cousyn B. Mangano R. Neveu F. Posylkin M. Whitelaw J.H. “Evaluation of the Influence of Injector Type in a Four-Valve Engine” SAE Paper 961998 1996
- Manz P.W. “Operating a Gasoline Engine at Constant low Temperature Conditions. The Influence of Different Fuel Droplet Sizes” SAE Paper 961999 1996
- Shayler P.J. Colechin M.J.F. Scarisbrick A. “Intra-Cycle Resolution of Heat Transfer to Fuel in the Intake Port of an SI Engine” SAE Paper 961995 1996
- Shayler P.J. Davies M.T. Colechin M.J.F. Scarisbrick A. “Intake Port Fuel Transport and Emissions: The Influence of Injector Type and Fuel Composition” SAE Paper 961996 1996
- Wensing M. Münch K.-U. Leipertz A. Schäck S. 285 295 1997
- Münch K.-U. Krämer H. Leipertz A. “Investigation of Fuel Evaporation Inside the Intake of a SI Engine Using Laser-Induced Exciplex-Fluorescence with a New Seed” SAE Paper 961930 1996
- Reboux J. Puechberty D. Dionnet F. “A New Approach of Planar Laser Induced Fluorescence Applied to Fuel/Air Ratio Measurement in the Compression Stroke of a SI Engine” SAE Paper 941988 1994
- Fröba A.P. Rabenstein F. Münch K.-U. Leipertz A. “Mixture of Triethylamine (TEA) and Benzene as a New Seeding Material for the Quantitative Two-Dimensional Laser-Induced Exciplex Fluorescence Imaging of Vapor and Liquid Fuel Inside SI Engines” Combustion and Flame 1997
- Alkidas A.C. Drews R.J. “Effects of Mixture Preparation on HC Emissions of a SI Engine Operating Under Steady-State Cold Conditions” SAE Paper 961958 1996
- Heywood J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill New York 1988