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Portrait of Joakim Pagels

Joakim Pagels

Senior Lecturer

Portrait of Joakim Pagels

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

Author

  • Yann Gallo
  • Vilhelm Malmborg
  • Johan Simonsson
  • Erik Svensson
  • Mengqin Shen
  • Per-Erik Bengtsson
  • Joakim Pagels
  • Martin Tunér
  • Antonio Garcia
  • Öivind Andersson

Summary, in English

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.

Department/s

  • Combustion Engines
  • Ergonomics and Aerosol Technology
  • Combustion Physics
  • MERGE: ModElling the Regional and Global Earth system

Publishing year

2017

Language

English

Pages

308-314

Publication/Series

Fuel

Volume

193

Document type

Journal article

Publisher

Elsevier

Topic

  • Energy Engineering
  • Other Physics Topics

Keywords

  • Soot oxidation
  • Particulate matter
  • OH
  • EGR
  • Gas sampling
  • Laser extinction

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-7153