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OH Radical and Soot Concentration Structures in Diesel Sprays under Low Sooting and Non-Sooting Conditions
Technical Paper
2018-01-1690
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In an optically accessible high-pressure/high-temperature (HP/HT) chamber, OH radicals, soot concentration, and OH* chemiluminescence images were captured simultaneously at a constant ambient temperature of 823 K and a gas density of 20 kg/m3, with injection pressures of 800-2000 bar using an injector with nozzle orifice having a diameter of 0.1 mm. Swedish market sold MK1 diesel fuel was used in this study. The optical diagnostic methods used were the two-dimensional laser extinction for the soot concentration measurement, planar laser induced fluorescence for the OH radical measurement, OH* chemiluminescence imaging, and the natural flame luminosity imaging. The objective of this study is to explore the diesel spray structures under the low sooting and non-sooting conditions. In this study, it was found that the OH radical zone in the jet’s upstream region expanded to the jet center and the soot concentration decreased when the fuel injection pressure increased. The expansion of the OH radical zone correlated well with the reduction of the sooting zone in the radial and axial directions. Under the non-sooting conditions, the OH radicals occupied the entire reacting region of the jet. A longer lift-off length leading to a reduction in the equivalence ratio (i.e. fuel leaner mixture), which resulted in an expansion of the OH radical zone, a decrease in sooting zone width, and a decrease in the soot formation.
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Citation
Du, C. and Andersson, M., "OH Radical and Soot Concentration Structures in Diesel Sprays under Low Sooting and Non-Sooting Conditions," SAE Technical Paper 2018-01-1690, 2018, https://doi.org/10.4271/2018-01-1690.Data Sets - Support Documents
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References
- Kalghatgi, G.T. , “The Outlook for Fuels for Internal Combustion Engines,” International Journal of Engine Research 15(4):383-398, 2014, doi:10.1177/1468087414526189.
- Dec, J. , “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging*,” SAE Technical Paper 970873 , 1997, doi:10.4271/970873.
- Kosaka, H., Aizawa, T., and Kamimoto, T. , “Two-Dimensional Imaging of Ignition and Soot Formation Processes in a Diesel Flame,” International Journal of Engine Research 6(1):21-42, 2005, doi:10.1243/146808705X7347.
- Bruneaux, G. , “Combustion Structure of Free and Wall-Impinging Diesel Jets by Simultaneous Laser-Induced Fluorescence of Formaldehyde, Poly-Aromatic Hydrocarbons, and Hydroxides,” International Journal of Engine Research 9(3):249-265, 2008, doi:10.1243/14680874JER00108.
- Idicheria, C. and Pickett, L. , “Formaldehyde Visualization Near Lift-off Location in a Diesel Jet,” SAE Technical Paper 2006-01-3434 , 2006, doi:10.4271/2006-01-3434.
- Pickett, L.M. and Siebers, D.L. , “Soot Formation in Diesel Fuel Jets near the Lift-off Length,” International Journal of Engine Research 7(2):103-130, 2006, doi:10.1243/146808705X57793.
- Du, C., Andersson, S., and Andersson, M. , “Two-Dimensional Measurements of Soot in a Turbulent Diffusion Diesel Flame: The Effects of Injection Pressure, Nozzle Orifice Diameter and Gas Density,” Combustion Science and Technology, 2018, doi:10.1080/00102202.2018.1461850.
- Du, C., Andersson, M., and Andersson, S. , “Effects of Nozzle Geometry on the Characteristics of an Evaporating Diesel Spray,” SAE Int. J. Fuels Lubr. 9(3):493-513, 2016, doi:10.4271/2016-01-2197.
- Gaydon, A. , The Spectroscopy of Flames (Springer Science & Business Media, 2012), doi:10.1007/978-94-009-5720-6.
- Du, C. , “Study of Diesel Sprays under Non-Reaction and Reacting Conditions,” Ph.D. thesis, Department of Mechanics and Maritime Sciences, Chalmers University of Technology, 2017.
- Higgins, B. and Siebers, D. , “Measurement of the Flame Lift-Off Location on DI Diesel Sprays Using OH Chemiluminescence,” SAE Technical Paper 2001-01-0918 , 2001, doi:10.4271/2001-01-0918.
- Le, M.K., Kook, S., and Hawkes, E.R. , “The Planar Imaging of Laser Induced Fluorescence of Fuel and Hydroxyl for a Wall-Interacting Jet in a Single-Cylinder, Automotive-Size, Optically Accessible Diesel Engine,” Fuel 140:143-155, 2015, doi:10.1016/j.fuel.2014.09.089.
- Musculus, M. , “Multiple Simultaneous Optical Diagnostic Imaging of Early-Injection Low-Temperature Combustion in a Heavy-Duty Diesel Engine,” SAE Technical Paper 2006-01-0079 , 2006, doi:10.4271/2006-01-0079.
- Maes, N., Meijer, M., Dam, N., Somers, B. et al. , “Characterization of Spray A Flame Structure for Parametric Variations in ECN Constant-Volume Vessels Using Chemiluminescence and Laser-Induced Fluorescence,” Combustion and Flame 174:138-151, 2016, doi:10.1016/j.combustflame.2016.09.005.
- Musculus, M. and Kattke, K. , “Entrainment Waves in Diesel Jets,” SAE Int. J. Engines 2(1):1170-1193, 2009, doi:10.4271/2009-01-1355.
- Pickett, L., Manin, J., Genzale, C., Siebers, D. et al. , “Relationship Between Diesel Fuel Spray Vapor Penetration/Dispersion and Local Fuel Mixture Fraction,” SAE Int. J. Engines 4(1):764-799, 2011, doi:10.4271/2011-01-0686.
- Singh, S., Musculus, M.P., and Reitz, R.D. , “Mixing and Flame Structures Inferred from OH-PLIF for Conventional and Low-Temperature Diesel Engine Combustion,” Combustion and Flame 156(10):1898-1908, 2009, doi:10.1016/j.combustflame.2009.07.019.
- Siebers, D. and Higgins, B. , “Flame Lift-Off on Direct-Injection Diesel Sprays Under Quiescent Conditions,” SAE Technical Paper 2001-01-0530 , 2001, doi:10.4271/2001-01-0530.
- Kojima, J., Ikeda, Y., and Nakajima, T. , “Spatially Resolved Measurement of OH*, CH*, and C2* Chemiluminescence in the Reaction Zone of Laminar Methane/Air Premixed Flames,” Proceedings of the Combustion Institute 28(2):1757-1764, 2000, doi:10.1016/S0082-0784(00)80577-9.