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RELATIVE ROLES OF PREMIXED AND DIFFUSION BURNING IN DIESEL COMBUSTION

Relative roles of premixed and diffusion burning in diesel combustion have been examined in terms of characteristic times for ignition delay (tau sub ig), combustion (tau sub c) and fuel-air mixing (tau sub m). Results indicate that the majority of the diesel combustion process is diffusion controlled, as in gas turbine combustion, since tau sub c is much less than tau sub m over the entire range of operating conditions. During the ignition phase, some premixed burning can occur in the fringe of the fuel spray where tau sub m is less than tau sub ig; however, most of the fuel injected prior to ignition also burns in the diffusion mode, since tau sub m is greater than tau sub ig in the majority of the fuel spray. The fraction of premixed burning which occurs during the ignition phase is increased by longer tau sub ig, high rates of fuel injection, high air swirl and the use of multi-hole injectors, which increase the surface area of the spray.

  • Availability:
  • Supplemental Notes:
    • Reprinted from SP-557 Combustion of Heterogeneous Mixtures. Fuels and Lubricants Meeting San Francisco, California, October 31-November 3, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Plee, S L
    • Ahmad, T
  • Publication Date: 1983

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 20 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00387280
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 831733 Reprint, HS-036 773
  • Files: HSL, USDOT
  • Created Date: Jul 30 1984 12:00AM