Bio-diesel effects on combustion processes in an HSDI diesel engine using advanced injection strategies

Tiegang Fang, Chia Fon Lee

Research output: Contribution to journalConference articlepeer-review


An optically accessible single-cylinder high-speed direct-injection (HSDI) diesel engine was used to investigate the combustion process using different fuels including European low sulfur diesel and bio-diesel fuels with advanced multiple injection strategies. Influences of injection timings and fuel types on combustion characteristics and emissions were studied under similar loads. In-cylinder pressure was measured and used for heat release analysis. High-speed combustion videos were captured for all the studied cases using the same frame rate. NOx emissions were measured in the exhaust pipe. Different combustion modes including conventional diesel combustion and low-temperature combustion were observed and confirmed from the heat release rates and the combustion images. Natural luminosity was found consistently lower for bio-diesel than the European low sulfur diesel fuel for all the cases. However, for NOx emissions, under conventional combustion cases such as cases 2 and 3, it was found that bio-diesel leads to increased NOx emissions. Under a certain injection strategy with retarded main injections like case 4 and 5, it is possible to have up to 34% lower NOx emissions for B100 than B0 for case 4 with low-temperature combustion mode. Simultaneous reduction of NOx and natural luminosity was achieved for advanced low-temperature combustion mode. It is hypothesized based on the results that the lower soot generation for bio-diesel fuel is believed due to a lower soot formation rate and a higher soot oxidation rate. The NOx increase problem for bio-diesel fuel can be amended by employing advanced injection strategies with low-temperature combustion modes.

Original languageEnglish (US)
Pages (from-to)2785-2792
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 II
StatePublished - 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008


  • Advanced injection strategy
  • Bio-diesel
  • Diesel combustion
  • Low-temperature combustion
  • Natural luminosity

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry


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