Investigation of Late-Cycle Soot Oxidation Using Laser Extinction and In-Cylinder Gas Sampling at Varying Inlet Oxygen Concentrations in Diesel Engines

Research output: Contribution to journalArticle


This study focuses on the relative importance of O2 and OH as oxidizers of soot during the late cycle in diesel engines, where the soot oxidation is characterized in an optically accessible engine using laser extinction measurements. These are combined with in cylinder gas sampling data from a single cylinder engine fitted with a fast gas sampling valve. Both measurements confirm that the in-cylinder soot oxidation slows down when the inlet concentration of O2 is reduced. A 38% decrease in intake O2 concentration reduces the soot oxidation rate by 83%, a non-linearity suggesting that O2 in itself is not the main soot oxidizing species. Chemical kinetics simulations of OH concentrations in the oxidation zone and estimates of the OH soot oxidation rates point towards OH being the dominant oxidizer.


External organisations
  • Polytechnic University of Valencia
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Energy Engineering


  • Soot oxidation, Particulate matter, OH, EGR, Gas sampling, Laser extinction
Original languageEnglish
Pages (from-to)308–314
Publication statusPublished - 2017
Publication categoryResearch

Related research output

Gallo, Y., 2016 Nov 8, First ed. Lund: Lund University Faculty of Engineering Department of Energy Sciences Division of Combustion Engines P.O. Box 118, SE-221 00 LUND Sweden. 189 p.

Research output: ThesisDoctoral Thesis (compilation)

Gallo, Y., Simonsson, J., Ted Lind, Per-Erik Bengtsson, Bladh, H. & Öivind Andersson, 2015 Apr 14, In : SAE Technical Paper. 2015-01-0800.

Research output: Contribution to journalArticle

Vilhelm Malmborg, Shen, M., Axel Eriksson, Waldheim, B., Gallo, Y., Johan Martinsson, Patrik Nilsson, Öivind Andersson, Johansson, B. & Joakim Pagels, 2015, p. 1-1.

Research output: Contribution to conferenceAbstract

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