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Analysis of Smokeless Spray Combustion in a Heavy-Duty Diesel Engine by Combined Simultaneous Optical Diagnostics
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 20, 2009 by SAE International in United States
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A heavy duty diesel engine operating case producing no engine-out smoke was studied using combined simultaneous optical diagnostics. The case was close to a typical low load modern diesel operating point without EGR. Parallels were drawn to the conceptual model by Dec and results from high-pressure combustion vessels. Optical results revealed that no soot was present in the upstream part of the jet cross-section. Soot was only observed in the recirculation zones close to the bowl perimeter. This indicated very slow soot formation and was explained by a significantly higher air entrainment rate than in Dec's study. The local fuel-air equivalence ratio, Φ, at the lift-off length was estimated to be 40% of the value in Dec's study. The lower Φ in the jet produced a different Φ -T-history, explaining the soot results. The increased air entrainment rate was mainly due to smaller nozzle holes and increased TDC density. Furthermore, increased injection pressure was believed to reduce the residence time in the jet, thus reducing the soot formation. OH was detected at the periphery of the jet, upstream of the location where fuel started to react on the jet centerline. The OH region extended relatively far into the jet, further supporting the conclusion of a less fuel-rich jet in the current case. Partially oxidized fuel (POF) was found at the center of the jet, downstream of the lift-off position. This indicated that the temperature needed to start chemical reactions inside the jet had not been obtained at the lift-off position. The high-temperature reaction zone at the periphery thus added heat over a distance before POF was observed on the centerline.
CitationChartier, C., Aronsson, U., Andersson, Ö., Egnell, R. et al., "Analysis of Smokeless Spray Combustion in a Heavy-Duty Diesel Engine by Combined Simultaneous Optical Diagnostics," SAE Technical Paper 2009-01-1353, 2009, https://doi.org/10.4271/2009-01-1353.
- Musculus M.P.B “Multiple Simultaneous Optical Diagnostic Imaging of Early Injection Low Temperature Combustion in a Heavy Duty Diesel Engine” SAE paper 2006-01-0079 2006
- Dec J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging” SAE paper 970873 1997
- Pickett L.M. Siebers D.L. “Soot Formation in Diesel Fuel Jets Near the Lift Off Length” Proceedings of IMechE IJER03505 7 103 130
- Siebers D.L. Higgins B. “Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions” SAE paper 2001-01-0530 2001
- Higgins B. Siebers D.L. “Measurement of the Flame Lift-Off Location on DI Diesel Sprays Using OH Chemiluminescence” SAE paper 2001-01-0918 2001
- Pickett L.M. Siebers D.L. Idicheria C.A. “Relationship Between Ignition Process and the Lift-Off Length of Diesel Fuel Jets,” SAE paper 2005-01-3843 2005
- Idicheria C.A. Pickett L.M “Formaldehyde Visualization Near Lift-Off Location in a Diesel Jet” SAE paper 2006-01-3434 2006
- Musculus M.P.B “Effects of the In-Cylinder Environment on Diffusion Flame Lift-Off in a DI Diesel Engine,” SAE paper 2003-01-0074 2003
- Pickett L.M. Siebers D.L. “Non Sooting, Low Flame Temperature Mixing-Controlled DI Diesel Combustion” SAE paper 2004-01-1399 2004
- Kohse-Höinghaus K. “Laser Techniques for the Quantitative Detection of Reactive Intermediates in Combustion Systems” Progress in Energy and Combustion Science 20 203 279 1994
- Collin R. Nygren J. Richter M. Aldén M. Hildingsson L. Johansson B. “Studies of the Combustion Process with Simultaneous OH- and Formaldehyde-PLIF in a Direct-Injected HCCI engine” Proceedings of the Sixth International Symposium on Combustion Diagnostics and Modeling of Combustion in Internal Combustion Engines (COMODIA) August 2-5 Yokohama, Japan 311 317 2004
- Hofmann M. Bessler W.G. Schulz C Jander H. “Laser-Induced Incandescence for Soot Diagnostics at High Pressures” Appl. Optics 42 12 2052 2062 2003
- Axelsson B. Collin R. Bengtsson P.-E. “Laser-Induced Incandescence for Soot Particle Size Measurements in Premixed Flat Flames” Appl. Optics 39 3683 3690 2000
- Aronsson U. Chartier C. Andersson Ö. Egnell R. Sjöholm J. Richter M. Aldén M. “Analysis of the Correlations Between Engine Out Particulates and Local in the Lift-Off Region of a Heavy Duty Diesel Engine Using Raman Spectroscopy” SAE paper SAE World Congress 2009
- Akihama K. Takatori Y. Inagaki K. Sasaki S. Dean A.M. “Mechanism of the Smokeless Rich Diesel Combustion by Reducing Temperature” SAE paper 2001-01-0655 2001
- Naber J.D. Siebers D.L. “Effect of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays” SAE paper 960034 1996
- Pickett L.M. Caton J.A. Musculus M.P.B. Lutz A.E. “Evaluation of the Equivalence Ratio-Temperature Region of Diesel Soot Precursor Formation Using a Two-Stage Lagrangian Model” Proceedings of IMechE IJER00606 7 349 370 2006