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Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions
Technical Paper
2001-01-0530
ISSN: 0148-7191, e-ISSN: 2688-3627
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Event:
SAE 2001 World Congress
Language:
English
Abstract
Ambient gas temperature and density, injection pressure, and orifice diameter effects on the flame lift-off length on a direct-injection (DI) diesel spray under quiescent conditions were experimentally investigated. The impacts of the observed lift-off length variations on air entrainment upstream of the lift-off location, soot formation, and the relationship between fuel vaporization and combustion were also examined. The research was conducted in a constant-volume combustion vessel using a common-rail fuel injector and a Phillips research grade #2 diesel fuel.
The lift-off length measurements show that lift-off length decreases with increasing ambient gas temperature or density, and increases with increasing injection pressure or orifice diameter. The sensitivity of lift-off length to a change in either temperature or density was non-linear, with the sensitivity to either parameter decreasing as it increased. The increase in lift-off length with increasing injection pressure was linearly dependent on injection velocity. Estimates of the air entrainment upstream of the lift-off length, show that the amount of fuel-air pre-mixing upstream of the lift-off length is dependent on the combined effects of many of the above mentioned parameters on air entrainment and the lift-off length. Coupling the air entrainment estimates with soot incandescence measurements indicates that there is a strong link between the fuel-air mixing upstream of the lift-off length and soot formation. Soot incandescence was observed to decrease as the amount of fuel-air premixing upstream of the lift-off length increased, with no significant soot incandescence (i.e., no significant soot) being observed when enough air was entrained to reduce the average equivalence ratio at the lift-off length to a value less than approximately two. Finally, comparison of the lift-off lengths with previously measured liquid lengths indicates that the relationship between fuel vaporization and combustion is strongly affected by ambient gas and injector parameters.
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Citation
Siebers, D. and Higgins, B., "Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions," SAE Technical Paper 2001-01-0530, 2001, https://doi.org/10.4271/2001-01-0530.Also In
References
- Rothrock, A.M. Waldron, C.D. “Effect of Nozzle Design on Fuel Spray and Flame Formation in a High-Speed Compression-Ignition Engine,” NACA 1936
- Shundoh, S. Kakegawa, T. Tsujimura, K. “The Effect of Injection Parameters and Swirl on Diesel Combustion with High Pressure Fuel Injection” Transactions of the SAE 100 793 805 1991
- Verhoeven, D. Vanhemelryck, J. Baritaud, T. “Macroscopic and Ignition Characteristics of High-Pressure Sprays of Single-Component Fuels,” Transactions of the SAE 107 1654 1668 1998
- Dec, J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” Transactions of the SAE 106 1319 1348 1997
- Naber, J.D. Siebers, D.L. “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” Transactions of the SAE 105 82 111 1996
- Chomiak, J. Karlsson, A. “Flame Liftoff in Diesel Sprays,” Twenty-Sixth Symposium (International) on Combustion The Combustion Institute Pittsburgh 2557 2504 1996
- 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 1999
- Kalghatgi, G.T. “Lift-off Heights and Visible Flame Lengths of Vertical Turbulent Jet Diffusion Flames in Still Air,” Combustion Science and Technology 41 17 19 1984
- Pitts, W.M. “Importance of Isothermal Mixing Processes to the Understanding of Lift-Off and Blowout of Turbulent Jet Diffusion Flames,” Combustion and Flame 76 197 312 1989
- Tacke, M.M. Geyer, D. Hassel, E.P. Janicka, J. “A Detailed Investigation of the Stabilization Point of Lifted Turbulent Diffusion Flames,” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute Pittsburgh 1157 1165 1998
- Hasselbrink E.F. Jr., Mungal, M.G. “Characteristics of the Velocity Field Near the Instantaneous Base of Lifted Non-Premixed Turbulent Jet Flames,” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute Pittsburgh 867 873 1998
- Brockhinke, A. Andresen, P. Kohse-Höinghaus, K. “Contributions to the Analysis of Temporal and Spatial Structures Near the Lift-Off Region of a Turbulent Hydrogen Diffusion Flame,” Twenty-Sixth Symposium (International) on Combustion The Combustion Institute Pittsburgh 153 159 1996
- Schefer, R.W. Namazian, M. Kelly, J. “Stabilization of Lifted Turbulent-Jet Flames,” Combustion and Flame 99 75 86 1994
- Schefer, R.W. Namazian, M. Filtopoulos, E.E.J. Kelly, J. “Temporal Evolution of Turbulence/Chemistry Interactions in Lifted, Turbulent-Jet Flames,” Twenty-Fifth Symposium (International) on Combustion The Combustion Institute Pittsburgh 1223 1231 1994
- Peters, N. Turbulent Combustion Cambridge University Press Cambridge, UK 2000
- Winklhofer, E. Fuchs, H. Philipp, H. “Diesel Spray Combustion - An Optical Imaging Analysis,” Transactions of the SAE 102 1154 1163 1993
- Larsson, A. “Optical Studies in a DI Diesel Engine,” SAE 1999-01-3650 1999
- Higgins, B.S. Siebers D.L. “Measurement of the Flame Lift-off Location on DI Diesel Sprays Using OH Chemiluminescence,” SAE 2001-01-0918 2001
- Siebers, D.L. Higgins, B.S. “Effects of Injector Conditions on the Flame Lift-Off Length of DI Diesel Sprays,” Conference on Thermalfluidynamic Processes in Diesel Engines Sept. 14-15 2000
- Siebers, D.L. “Liquid-Phase Fuel Penetration in Diesel Sprays,” Transactions of the SAE 107 1205 1227 1998
- Siebers, D.L. “Ignition Delay Characteristics of Alternative Diesel Fuels: Implications on Cetane Number,” Transactions of the SAE 94 673 686 1985
- Oren, D.C. Wahiduzzaman, S. Ferguson, C.R. “A Diesel Combustion Bomb: Proof of Concept,” Transactions of the SAE 93 945 960 1984
- Durrett, R.P. Oren, D.C. Ferguson, C.R. “A Multidimensional Data Set for Diesel Combustion Model Validation: I-Initial Conditions, Pressure History and Spray Shapes,” SAE 872087 1987
- Siebers., D.L. “Scaling Liquid-Phase Fuel Penetration in Diesel Sprays Based on Mixing-Limited Vaporization,” SAE 1999-01-0528 1999
- Naber, J.D. Siebers, D.L. Caton, J.A. Westbrook, C.K. Di Julio, S.S. “Natural Gas Autoignition Under Diesel Conditions: Experiments and Chemical Kinetic Modeling,” Transactions of the SAE 103 1735 1753 1994
- Naber, J.D. Siebers, D.L. “Hydrogen Combustion Under Diesel Engine Conditions,” International Journal of Hydrogen Energy 23 5 363 371 1998
- Gaydon, A.G. The Spectroscopy of Flames Chapman and Hall Ltd. London 1974
- Crosley, D.R. Dryer, M.J. “Two-Dimensional Imaging of Laser-Induced Fluorescence in OH in a Flame,” Proceedings of the International Conference on Lasers Dec. 1982
- Kosaka, H. Nishigaki, T. Kamimoto, T. Sano, T. Matsutani, A. Harada, S. “Simultaneous 2-D Imaging of OH Radicals and Soot in a Diesel Flame by Laser Sheet Techniques,” Transactions of the SAE 105 1184 1195 1996
- Heywood, J. Internal Combustion Engines McGraw-Hill New York 1988
- Dec J.E. Espey, C. “Soot and Fuel Distributions in a D.I. Diesel Engine via 2-D Imaging,” Transactions of the SAE 101 1642 1651 1992
- Kamimoto, T. Yokota, H. Kobayashi, H. “Effect of High Pressure Injection on Soot Formation Processes in a Rapid Compression Machine to Simulate Diesel Flames,” Transactions of the SAE 96 4.783 4.791 1987
- Canaan, R.E. Dec, J.E. Green, R.M. “The Influence of Fuel Volatility on the Liquid-Phase Fuel Penetration in a Heavy-Duty D.I. Diesel Engine,” Transactions of the SAE 107 583 602 1998