Heat release comparison between optical and all-metal HSDI diesel engines

Ulf Aronsson*, Clement Chartier, Uwe Horn, Öivind Andersson, Bengt Johansson, Rolf Egnell

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

33 Scopus citations


Experiments are performed in optical engines in order to understand the combustion process in standard engines. In spite of this, little work has been done to verify that the results from optical engines are representative for a standard engine. The wall heat losses in optical engines are lower than in all-metal engines due to the lower heat conductivity of optical parts and a less efficient cooling system. Furthermore, optical engines often have larger crevice volumes due to a lower position of the piston rings. The present investigation studies how these differences affect the heat release and emissions in optical HSDI diesel engines. Five different engine configurations are studied: an optical engine of Bowditch design with two different squish heights, the same engine fitted with a metal piston, the same engine with all quartz parts replaced with metal components and, finally, a standard diesel engine. It is found that the use of optical parts affect the combustion process. The effects can be seen both in the heat release and in the exhaust emissions. They are explained by differences in heat conductivity between the wall materials of the engines investigated. It is shown that the differences can be compensated for by adjusting the inlet temperature.

Original languageEnglish (US)
StatePublished - Dec 1 2008
Event2008 World Congress - Detroit, MI, United States
Duration: Apr 14 2008Apr 17 2008


Other2008 World Congress
Country/TerritoryUnited States
CityDetroit, MI

ASJC Scopus subject areas

  • Automotive Engineering
  • Safety, Risk, Reliability and Quality
  • Pollution
  • Industrial and Manufacturing Engineering


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