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Effect of Fuel Aromatics on In-Flame Diesel Soot Nanostructure via HRTEM
Technical Paper
2015-01-1829
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In order to examine the effect of fuel aromatics on soot processes in diesel flame, nanostructure and morphology of soot particles directly sampled in a diesel flame were investigated via High-Resolution Transmission Electron Microscopy (HRTEM). Three test fuels with different aromatic contents, aromatic-free Fischer-Tropsch Diesel (FTD), naphthalene-added (65,000ppm) FTD and conventional JIS#2 diesel fuels were used. TEM grids were directly exposed to single-shot diesel flames in a constant volume combustion chamber under a diesel-like condition with EGR (1000K, 2.7MPa, 15%O2) to thermophoretically sample soot particles at different axial locations from 40 to 120mm from nozzle. The soot nanostructure such as length, tortuosity and separation of lattice fringes in primary particles and morphology such as primary particle diameter and aggregate gyration radius were analyzed and compared among different fuels and in-flame locations. In contrast to notable variations of the morphology, the obtained fringe length and tortuosity were almost constant, regardless of the fuel aromatic contents and the in-flame locations. The fringe separation slightly decreased towards downstream in the flame, likely due to annealing of carbon graphenes in increasing temperature confirmed by in-flame thermocouple measurements. The variations in fringe separation did not show significant difference with fuel aromatic contents. On the other hand, the in-cylinder to exhaust variations of soot nanostructure from engine experiments in a literature were found to be significantly larger than the in-flame variations obtained in the present study suggesting the significance of late-cycle in-cylinder soot oxidation, although the difference in the experimental conditions should be kept in mind.
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Aizawa, T., Takahata, N., Okabe, K., and Mizutani, Y., "Effect of Fuel Aromatics on In-Flame Diesel Soot Nanostructure via HRTEM," SAE Technical Paper 2015-01-1829, 2015, https://doi.org/10.4271/2015-01-1829.Also In
References
- Bockhorn , H. Soot Formation in Combustion - Mechanisms and Models Springer Series in Chemical Physics 59 Springer Verlag 1994
- Wang , H. Formation of Nascent Soot and Other Condensed-Phase Materials in Flames Proceedings of Combustion Institute 33 41 67 2011
- Wang , H. , Jiao , Q. , Yao , M. , Yang , B. , Qiu , L. and Reitz , R.D. Development of an n-heptane/toluene/polyaromatic hydrocarbon mechanism and its application for combustion and soot prediction International Journal of Engine Research 14 5 434 451 2013
- Michele , B. , Yuri , M. W. , Konstantinos , B. , Giulio , B. et al. Soot Formation Modeling of n-Heptane Sprays Under Diesel Engine Conditions Using the Conditional Moment Closure Approach Combustion Science and Technology 185 766 793 2013
- Kaminaga , T. , Kusaka , J. and Ishii , Y. A three-dimensional numerical study on exhaust gas emissions from a medium-duty diesel engine using a phenomenological soot particle formation model combined with detailed chemistry International Journal of Engine Research 9 4 283 296 2008
- Kraft , M. , Mosbach , S. , Celnik , M. S. , and Kim , K. O. et al. Towards a detailed soot model for internal combustion engines Combustion and Flame 156 1156 1165 2009
- Manin , J. , Skeen , S. , Pickett , L. , Kurtz , E. et al. Effects of Oxygenated Fuels on Combustion and Soot Formation/Oxidation Processes SAE Int. J. Fuels Lubr. 7 3 704 717 2014 10.4271/2014-01-2657
- Kook , S. and Pickett , L. Soot Volume Fraction and Morphology of Conventional, Fischer-Tropsch, Coal-Derived, and Surrogate Fuel at Diesel Conditions SAE Int. J. Fuels Lubr. 5 2 647 664 2012 10.4271/2012-01-0678
- Svensson , K.I. , Richards , M.J. , Mackrory , A.J. , Tree , D.R. Fuel Composition and Molecular Structure Effects on Soot Formation in Direct-Injection Flames Under Diesel Engine Conditions SAE Technical Paper 2005-01-0381 2005
- Wei , J. , Song , C. , Lv , G. , Song , J. , Wang , L. and Pang , H. A comparative study of the physical properties of in-cylinder soot generated from the combustion of n -heptane and toluene/ n -heptane in a diesel engine Proceedings of the Combustion Institute 35 2 1939 1946 2015
- Nakakita , K. , Ban , H. , Takasu , S. , Hotta , Y. , Inagaki , K. , Weissman , W. , Farrell , J.T. Effect of Hydrocarbon Molecular Structure in Diesel Fuel on In-Cylinder Soot Formation and Exhaust Emissions SAE Technical Paper 2003-01-1914 2003
- Song , J. , Lee , K.O. , Farrell , J.T. Fuel Property Impacts on Diesel Particulate Morphology, Nanostructures, and NOx Emissions SAE Technical Paper 2007-01-0129 2007
- Aizawa , T. , Abdullah , M. F. E. B. , Inoue , A. , Ishidzuka , Y. , Taki , N. and Kosaka , H. Aromatic Additive Effects on Soot Formation in a Fischer-Tropsch Diesel (FTD) Spray Flame via Laser Spectroscopy The International Conference on Modeling and Diagnostics for Advanced Engine Systems (COMODIA2012) Japan July 23 26 2012
- Okabe , K , Sakai , M. , Mizutani , Y. , and Aizawa , T. Aromatic Additive Effect on Soot Formation and Oxidation in Fischer-Tropsch Diesel (FTD) Spray Flame -Morphology and Nanostructure Analysis of In-Flame Soot Particles via HRTEM- SAE Int. J. Fuels Lubr. 6 3 807 816 2013 10.4271/2013-01-2681
- Kondo , K. , Yamaguchi , T. , Nishigai , H. , Takano , S. et al. High-Resolution Transmission Electron Microscopy of Soot Directly Sampled at Different Axial Locations in Diesel Spray Flame SAE Technical Paper 2011-24-0068 2011
- Kuribayashi , M. , Mizutani , Y. , Ishizuka , Y. , Taki , N. et al. Effects of Ambient Oxygen Concentration on Soot Processes in Diesel Spray Flame - A Qualitative Comparison between TEM Analysis and LII/Scattering Laser Measurements SAE Int. J. Fuels Lubr. 7 3 693 703 2014 10.4271/2014-01-2642
- Li , Z. , Song , C. , Song , J. , Lv , G. , Dong , S. , and Zhao , Z. Evolution of the nanostructure, fractal dimension and size of in-cylinder soot during diesel combustion process Combust. Flame 158 8 2011 1624 1630
- Sakai , M. , Iguma , H. , Kondo , K. , Aizawa , T. Nanostructure Analysis of Primary Soot Particles Directly Sampled in Diesel Spray Flame via HRTEM SAE Technical Paper 2012-01-1722 2012
- Aizawa , T. , Kosaka , H. Effects of Fischer-Tropsch diesel fuel on soot formation processes in a diesel spray flame Int. J. Engine Res. 11 1 2010 79 87
- Faccinetto , A. , Desgroux , P. , Ziskind , M. , Therssen , E. , Focsa , C. High-sensitivity detection of polycyclic aromatic hydrocarbons adsorbed onto soot particles using laser desorption/laser ionization/time-of-flight mass spectrometry: An approach to studying the soot inception process in low-pressure flames Combust. Flame 158 2 2011 227 239
- Aizawa , T. , Kosaka , H. Investigation of early soot formation process in a diesel spray flame via excitation-emission matrix using a multi-wavelength laser source Int. J. Engine Res. 9 2008 79 96
- Kondo , K. , Aizawa , T. , Kook , S. , and Pickett , L. Uncertainty in Sampling and TEM Analysis of Soot Particles in Diesel Spray Flame SAE Technical Paper 2013-01-0908 2013
- Megaridis , C. M. , and Dobbins , R. A. Morphological Description of Flame-Generated Materials Combust. Sci. Technol. 71 1 3 95 109 1990
- Heywood , J. B. Internal Combustion Engine Fundamentals McGraw-Hill 1988 631 645 646
- Yehliu , K. , Vander Wal , R. L. and Boehman , A. L. Development of an HRTEM image analysis method to quantify carbon nanostructure Combust. Flame 158 9 2011 1837 1851
- Nishigai , H , Kondo , K , Yamaguchi , T and Aizawa , T Morphology of JIS#2 and Fischer Tropsch Diesel (FTD) Soot Tropsch Diesel (FTD) Soot in Spray Flames via Transmission Electron Microscopy (TEM) Proc. of COMODIA 2012 Japan July 23 26 2012
- Harada , T. , Koga , N. , Aizawa , T. , Adachi , T. and Kusaka , J. In-flame Temperature Measurements of Diesel Spray Flame using 50µm Thin-Wire Type-R Thermocouple The 24 th Internal Combustion Engines symposium Paper-No. 20137034 Japan 2013