Effect of engine operating conditions on the size of primary particles composing diesel soot agglomerates

M. Lapuerta, F. J. Martos, Jose Martin Herreros

Research output: Contribution to journalArticle

149 Citations (Scopus)

Abstract

Particulate matter emitted by diesel engines is mainly formed by soot agglomerates, which are composed of primary particles forming irregular clusters. The primary particles have small variations in size and shape, although a narrow distribution can be effectively found. Soot agglomerates were collected with a thermophoretic sampling device installed in the exhaust pipe of a direct-injection diesel engine, and the samples were analysed using high resolution transmission electron microscopy. The size distributions of the primary particles have been shown to be quasi-monodisperse. Their mean size was obtained from averaging 10 primary particles per image, and five images per operating mode. The sampling location, the engine speed, the air/fuel ratio and the exhaust gas recirculation were independently modified, and some variations in the primary particle size were observed, mainly when the air/fuel ratio and the engine speed were varied. A time integrated equation has been proposed for estimating the rate of growth of the particles, which provided good fitting to the measured sizes. This equation uses as input the instantaneous cylinder pressure experimental data, as well as the temperature and heat release records obtained from the analysis of the cylinder pressure data (combustion diagnostic).
Original languageEnglish
Pages (from-to)455-466
JournalJournal of Aerosol Science
Volume38
Issue number4
DOIs
Publication statusPublished - 22 Feb 2007

Fingerprint

Soot
soot
Engine cylinders
diesel
Diesel engines
engine
Sampling
Engines
Exhaust gas recirculation
Particulate Matter
Direct injection
High resolution transmission electron microscopy
Air
diesel engine
Particle size
Pipe
sampling
air
transmission electron microscopy
particulate matter

Bibliographical note

The full text is currently unavailable on the repository.

Keywords

  • Diesel engines
  • Primary particles
  • Microscopy
  • Soot agglomerates

Cite this

Effect of engine operating conditions on the size of primary particles composing diesel soot agglomerates. / Lapuerta, M.; Martos, F. J.; Herreros, Jose Martin.

In: Journal of Aerosol Science, Vol. 38, No. 4, 22.02.2007, p. 455-466.

Research output: Contribution to journalArticle

Lapuerta, M. ; Martos, F. J. ; Herreros, Jose Martin. / Effect of engine operating conditions on the size of primary particles composing diesel soot agglomerates. In: Journal of Aerosol Science. 2007 ; Vol. 38, No. 4. pp. 455-466.
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