Particle mass and size distribution measurements were made on the exhaust of an Onan prechamber diesel engine in order to describe the influence of fuel and fuel additives on physical characteristics of particulate matter emitted from a prechamber diesel engine. Seven fuels were examined (No. 1 and No. 2 diesel fuels, 40 and 50 cetane number secondary reference fuels, and No. 2 diesel fuel doped with three different concentrations of Lubrizol 565, a barium-based smoke suppressant). Fuel cetane number had a marked influence on diesel exhaust particle emissions. Reducing the cetane number decreased particle mass and volume concentrations in exhaust. A probable explanation for this decrease was that longer ignition delay periods associated with reduced cetane number fuels allowed more complete mixing of fuel and air prior to ignition, thus minimizing the amount of fuel burnt under rich conditions that lead to particle formation. It was found that the barium smoke suppression additive markedly reduced Bosch smoke number but did not produce similar reductions in particle mass emissions. Under certain conditions of light load and high additive concentrations, mass emissions were increased. The additive apparently suppresses the production of light-absorbing carbon particles, but leads to the formation of dense but only weakly light-absorbing barium-containing particles. No. 1 and No. 2 diesel fuels and the 50 cetane number reference fuel produced very similar emissions, with emission indexes in the 0.3-1.3 mg range and volume mean diameters between 0.09 and 0.15 micrometers. The 40 cetane number reference fuel produced both smaller emission indexes and particle diameters.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Off-Highway Vehicle Meeting and Exposition, Milwaukee, Wisconsin, 11-14 September 1978. Supported in part by General Motors Corporation.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Dolan, D F
    • Diver, R B
    • Aufderheide, E
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00399029
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780787, HS-025 597U
  • Contract Numbers: EPA-R803851
  • Files: HSL, USDOT
  • Created Date: Aug 31 1985 12:00AM