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Diesel-Spray Ignition and Premixed-Burn Behavior
Technical Paper
2000-01-0940
ISSN: 0148-7191, e-ISSN: 2688-3627
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SAE 2000 World Congress
Language:
English
Abstract
The temporal and spatial evolution of the ignition and premixed-burn phases of a direct-injection (DI) diesel spray were investigated under quiescent conditions. The diagnostics used included temporally resolved measurements of natural light emission and pressure, and spatially resolved images of natural light emission. Temporally resolved natural light emission measurements were made with a photo-multiplier tube and a photodiode, while the images were acquired with an intensified CCD camera.
The experiments were conducted in an optically accessible, constant-volume combustion vessel over a range of ambient gas temperatures and densities: 800-1100 K and 7.3-45.0 kg/m3. The fuel used was a ternary blend of single-component fuels representative of diesel fuel with a cetane number of 45. The fuel was injected with a common-rail injector at high pressure (140 MPa).
The results provide new information on the evolution of the two-stage ignition/premixed-burn phases of DI diesel sprays. For conditions with longer ignition periods, the low-temperature (cool-flame), first-stage ignition chemistry (indicated by chemiluminescence and slow heat release) occurs mainly downstream of any liquid-phase fuel, over a broad region. As the ignition period shortens, the first stage chemistry moves closer to the liquid-phase region, eventually surrounding the inner, liquid fuel containing region of the spray for the shortest ignition periods examined. When the transition to the second stage of ignition and the premixed-burn occurs, the transition is fast throughout the region of first stage chemistry. Soot (incandescence) is first observed near the peak in the premixed-burn pressure spike. The timing of ignition events based on pressure histories was found to depend on pressure measurement and analysis techniques, which has important implications for comparing model predictions with measured engine pressure data.
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Higgins, B., Siebers, D., and Aradi, A., "Diesel-Spray Ignition and Premixed-Burn Behavior," SAE Technical Paper 2000-01-0940, 2000, https://doi.org/10.4271/2000-01-0940.Also In
References
- Heywood, J. Internal Combustion Engines McGraw-Hill New York 1988
- Hurn R.K. Hughes, K.J. “Combustion Characteristics of Diesel Fuels as Measured in a Constant-Volume Bomb,” SAE Transactions 6 24 35 1952
- Henein, N.A. Bolt, J.A. “Kinetic Considerations in the Autoignition and Combustion of Fuel Sprays in Swirling Air,” ASME Proceedings, Diesel & Gas Engine Power Conference & Exhibit, Paper No. 72-DGP-8 April 1972
- Siebers, D.L. “Ignition Delay Characteristics of Alternative Diesel Fuels: Implications on Cetane Number,” SAE Transactions 94 673 686 1985
- Henien, N. “Analysis of Pollutant Formation and Control and Fuel Economy in Diesel Engines,” Prog. Energy and Combust. Sci. 1 165 207 1976
- Nagase, K. Funatsu, K. “Spectroscopic Analysis of Diesel Combustion Flame by Means of Streak Camera,” SAE 881226 1988
- Dec, J.E. Espey, C. “Ignition and Early Soot Formation in a D.I. Diesel Engine Using Multiple 2-D Imaging Diagnostics,” SAE Transactions 104 853 875 1995
- Dec, J.E. Espey, C. “Chemiluminescence Imaging of Autoignition in a DI Diesel Engine,” SAE Transactions (in Press), SAE 982685 1998
- Higgins, B. Siebers, D.L. Mueller, C. Aradi, A. “Effects of an Ignition-Enhancing, Diesel-Fuel Additive on Diesel Spray Evaporation, Mixing, Ignition, and Combustion,” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute 1873 1880 1998
- Gaydon, A.G. The Spectroscopy of Flames Chapman and Hall Ltd. London 1974
- Bensen, S.W. “The Kinetics and Thermochemistry of Chemical Oxidation with Application to Combustion and Flame,” Prog. Energy and Combust. Sci. 7 125 134 1981
- Westbrook, C.K. Curran, H.J. Pitz, W.J. Griffiths, J.F. Mohamed, C. Wo, S.K. “The Effects of Pressure, Temperature, and Concentration on the Reactivity of Alkanes: Experiments and Modeling in a Rapid Compression Machine,” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute 371 378 1998
- Naber, J.D. Siebers, D.L. “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” SAE Transactions 105 82 111 1996
- Siebers, D.L. “Scaling Liquid-Phase Fuel Penetration in Diesel Sprays Based on Mixing-Limited Vaporization,” SAE 1999-01-0528
- Siebers, D.L. “Liquid-Phase Fuel Penetration in Diesel Sprays,” SAE Transactions (in Press), SAE 980809 1998
- 1984 Annual Book of ASTM Standards Petroleum Products, Lubricants, and Fossil Fuels 5 American Society for Testing and Materials Philadelphia, PA 1984
- Flynn, P.F. Durrett, R.P. Hunter, G.L. zur Loye, A.O. Akinyemi, O.C. Dec, J.E. Westbrook, C.K. “Diesel Combustion: An Integrated View Combining Laser Diagnostics, Chemical Kinetics, and Empirical Validation,” SAE 1999-01-0509
- Espey, C. Dec, J. Litzinger, T.A. Santavicca, D.A. “Planar Laser Rayleigh Scattering for Quantitative Vapor-Fuel Imaging in a Diesel Jet,” Combustion and Flame 99 65 86 1997
- Dec, J.E. Coy, E.B. “OH Radical Imaging in a Diesel Engine and the Structure of the Early Diffusion Flame,” Trans. SAE 105 1127 1148 1996
- Theobald, M.A. Alkidas, A.A. “On the Heat-Release Analysis of Diesel Engines: Effects of Filtering on Pressure Data,” SAE 872059 1987
- Dec, J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” Trans. SAE 106 1319 1348 1997