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Publication Detail
The influence of operating conditions on soot formation, oxidation and morphology in high-pressure spray combustion
  • Publication Type:
  • Authors:
    Crookes RJ, Demosthenous A
  • Publication date:
  • Pagination:
    255, ?
  • Published proceedings:
    International Symposium on Combustion, Abstracts of Works-in-Progress Posters
  • Status:
The effects of combustion chamber pressure, overall input air/fuel ratio and residence time, on soot particulate levels and characteristics, in a high-pressure, steady-flow spray burner were studied. Diesel fuel was used in all the tests, under conditions free from the cyclic variations normally encountered in a reciprocating diesel engine cylinder. Conditions in the spray core were invariably rich at all input conditions used, falling to the input value towards the tip of the flame, nearing the end of the chamber. The measured soot concentration (or volume fraction) normally rose to a peak value and then decayed along the flame to the tip. Increasing in intensity with richer input mixtures and occurring earlier with higher pressure, the peak concentration was in an annulus around the axis. Burn-up was more complete and earlier with leaner input mixtures and at higher pressures. Typical images, presented together with the corresponding particle-size analysis and mean diameter values, indicated that wide variations of primary-particle diameters were present in the agglomerates examined. For some individual primary particles within these agglomerates, through a considerable widening of the inter-crystallite spacing, from the normal graphitic-like value was demonstrated. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
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