1. Modification to Nagle/Strickland-Constable model with consideration of soot nanostructure effects.
- Author
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Song, Jinou, Song, Chonglin, Lv, Gang, Wang, Lin, and Bin, Feng
- Subjects
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NANOSTRUCTURES , *DIESEL motors , *PARTICLE size distribution , *TRANSMISSION electron microscopy , *COMBUSTION , *GRAPHITIZATION , *THERMOGRAVIMETRY - Abstract
The oxidation rates of diesel soot from the combustion chamber of a running diesel engine were calculated based on the particle size distributions at different crank angles. The primary particle diameter and nanostructure of soot were obtained by means of high-resolution transmission electron microscopy (HRTEM). The soot characteristics were also investigated by oxidative thermogravimetry and Raman scattering spectrometry. The results showed the soot nanostructures were dependent on engine operation conditions and combustion phases. The oxidation rates were found to differ by nearly fourfold from that calculated by the Nagle/Strickland-Constable (NSC) model for the soots studied here. The varied oxidation rates were interpreted in terms of differences in nanostructure between the soots. The experimental results were used to modify the NSC model and the fringe length of in-cylinder diesel soot was chosen to describe the influence of graphitisation on the oxidation of soot. The modified NSC model lessened the deviation between measurements and predictions. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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