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TEM Analysis of Soot Particles Sampled from Gasoline Direction Injection Engine Exhaust at Different Fuel Injection Timings
Technical Paper
2015-01-1872
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
For better understanding of in-cylinder soot formation processes and governing factors of the number of emitted soot particles of Gasoline Direct Injection (GDI) engines, Transmission Electron Microscope (TEM) analysis of morphology and nanostructure of the soot particles sampled in the exhaust should provide useful information. However, the number concentration of the soot particles emitted from GDI engines is relatively low, which was impeding reliable morphological analysis of the soot particles based on a sufficient number of sampled particles. Therefore, in the present study, a water-cooled thermophoretic sampler for simple and direct sampling of exhaust soot particles was developed and employed, which enabled to obtain a sufficient number of particle samples from the exhaust with Particulate Number (PN) 105 #/cc level for quantitative morphology analysis. Using the developed sampler, soot particles were sampled from the exhaust of a single-cylinder GDI test engine operated with three different fuel injection timings (advanced, normal, retarded) and their morphology and nanostructure were quantitatively analyzed. Number concentration and size distribution of the emitted particles were simultaneously measured with Scanning Mobility Particle Sizer (SMPS). The sampled GDI soot particles appeared to have typical chain-like aggregate structure and graphite-like inner-particle nanostructure similar to well-known diesel ones. The aggregate size (gyration radius) and the primary particle diameter ranged from 20 to 200nm and from 5 to 60nm, respectively, and both decreased depending on the fuel injection timing, in the order from advanced, normal and retarded. The distribution of TEM-based aggregate gyration diameter qualitatively well corresponded to that of SMPS-measured particle size, except that numerous nanoparticles smaller than 23nm, likely due to condensed volatile components detected by SMPS, but not observed in the TEM analysis.
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Miyashita, K., Fukuda, Y., Shiozaki, Y., Kondo, K. et al., "TEM Analysis of Soot Particles Sampled from Gasoline Direction Injection Engine Exhaust at Different Fuel Injection Timings," SAE Technical Paper 2015-01-1872, 2015, https://doi.org/10.4271/2015-01-1872.Also In
References
- 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 Lll/Scattering Laser Measurements SAE Int. J. Fuels Lubr. 7 3 693 703 2014 10.4271/2014-01-2642
- Steimle F. , Kulzer A. , Richter H. , Schwarzenthal D. and Romberg C. Systematic Analysis and Particle Emission Reduction of Homogeneous Direct Injection SI Engines SAE Technical Paper 2013-01-0248 2013
- Seong H. , Lee K.O. and Choi S. Effects of Engine Operating Parameters on Morphology of Particulates from a Gasoline Direct Injection (GDI) Engine SAE Technical Paper No. 2013-01-2574 2013
- Lee K.O. , Seong H. Detailed Morphological Properties of Nanoparticles from Gasoline Direct Injection Engine Combustion of Ethanol Blend SAE Technical Paper No. 2013-24-0185 2013
- Ishiguro , T. , Takatori , Y. and Akihama , K. Microstructure of Diesel Soot Particles Probed by Electron Microscopy: First Observation of Inner Core and Outer Shell Combust. Flame 108 1 2 1997 231 234
- Megaridis , C. M. , and Dobbins , R. A. Morphological Description of Flame-Generated Materials Combust. Sci. Technol. 71 1 3 95 109 1990
- Lee , K.O. , Cole , R. , Sekar , R. , Choi , M. Y. , Kang , J. S. , Bae , C. S. and Shin , H. D. Morphological Investigation of the Micro- structure, Dimensions, and Fractal Geometry of Diesel Particulates Proc. Combust. Inst. 29 1 647 653 2002
- Lee K. , Seong H. , Church W. , McConnel S. Examination of Particulate Emissions from Alcohol Blended Fuel Combustion in a Gasoline Direct Injection Engine Proc. of COMODIA 2012 Japan July 23 26 2012
- 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
- Aizawa , T. , Nishigai , H. , Kondo , K. , Yamaguchi , T. et al. Transmission Electron Microscopy of Soot Particles Directly Sampled in Diesel Spray Flame - A Comparison between US#2 and Biodiesel Soot SAE Int. J. Fuels Lubr. 5 2 665 673 2012 10.4271/2012-01-0695
- Kondo , K. , Aizawa , T. , Kook , S. , Pickett , L.M. Uncertainty in Sampling and TEM Analysis of Soot Particles in Diesel Spray Flame SAE Technical Paper No. 2013-01-0908 2013
- Heywood , J. B. Internal Combustion Engine Fundamentals McGraw-Hill 1988 631 645 646
- Vander Wal , R. L. , Tomasek , A. J. , Pamphlet , M. I. , Taylor , C. D. , Thompson , W. K. Analysis of HRTEM images for carbon nanostructure quantification J. Nanopart. Res. 6 6 555 568 2004
- 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 2012-01-1772 2012
- 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 1837 1851 2011
- Okabe , K. , Takahata , N. , and Aizawa , T. Nanostructure Analysis of In-flame Diesel Soot Particles via High-Resolution Transmission Electron Microscopy The 25 th Internal Combustion Engines symposium Paper-No. 18 Japan 2014
- 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 2014
- 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
- Hageman M.D. , Sakai S.S. , Rothamer D.A. Determination of soot onset and background particulate levels in a spark-ignition engine Proc. Combust. Inst. 35