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International Journal of Energy for a Clean Environment
SJR: 0.195 SNIP: 0.659 CiteScore™: 1.2

ISSN Print: 2150-3621
ISSN Online: 2150-363X

International Journal of Energy for a Clean Environment

Formerly Known as Clean Air: International Journal on Energy for a Clean Environment

DOI: 10.1615/InterJEnerCleanEnv.v7.i1.60
pages 77-91

FORMATION AND OXIDATION OF SOOT PARTICULATES IN A DIESEL FUEL SPRAY FLAME

R. J. Crookes
Department of Engineering, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
G. Sivalingam
Ford Motor Company, Dunton Technical Centre, Laindon, Basildon, Essex, UK

ABSTRACT

This paper presents an analysis of experimental data acquired inside the combustion chamber of a high-pressure steady-flow spray burner. The data consists of dimensions of primary particles in soot agglomerate samples taken from axial locations at different distances from the injector tip and at off-axis positions at a fixed axial distance mid-way along the chamber. Corresponding values of soot volume fraction are given. Diesel fuel was used in these tests, which were conducted at pressures between 1.1 and 2.1 MPa with input mixture equivalence ratios ranging from 0.8 to 1.2.
Particle size distribution and mean particle diameters were calculated at the different locations using transmitting electron microscopy and associated image-analysis diagnostics. A computer-simulated oxidation process was applied to measured size distributions from upstream locations to compare with actual measured distributions obtained at downstream locations. Agreement was found to depend on local conditions.
Evidence of internal oxidative attack is demonstrated for some individual primary particles within the agglomerates through a widening of the crystallite spacing under certain operating conditions.


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