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, Volume 78, Issue 6, pp 66–71 | Cite as

Reduction of Soot Emissions in Diesel Engines – Increased Air Utilisation by New Spray Hole Configurations

  • Klaus HielscherEmail author
  • Maximilian Brauer
  • Roland Baar

Soot forms in internal combustion engines mainly due to a local lack of oxygen. With conventional Diesel combustion processes regions of unused air remain between the injection jets in the beginning of the combustion. With two new spray hole configurations, these regions can be utilised better. But during the burnout phase the air utilisation is worsened which finally leads to increased particulate matter emissions. The investigations were carried out at the Chair of Internal Combustion Engines of TU Berlin as part of a cooperation project with IAV.

1 Motivation

The spray hole is the last part of the injection system the fuel passes through, hence the influence on the mixture formation and combustion is high. Stricter emission limits have led to the development of Diesel injection systems with ever smaller spray hole diameters. Decreased diameters lead to an improved spray break-up and the fuel evaporates more rapidly [1]. In turn, this leads to a lean mixture which generally has a...



The authors would like to thank all the employees of the Chair of ICE of TU Berlin and IAV Berlin for their support. The author's special thanks go to Lukas Moslener (IAV, formerly TUB), Alexander Salomon (TUB), and Axel Seiffert (IAV).

Copyright information

© Springer Fachmedien Wiesbaden Gmbh 2017

Authors and Affiliations

  • Klaus Hielscher
    • 1
    Email author
  • Maximilian Brauer
    • 2
  • Roland Baar
    • 3
  1. 1.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  2. 2.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany
  3. 3.Springer Fachmedien Wiesbaden GmbHWiesbadenGermany

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