COLD STARTABILITY OF OPEN-CHAMBER DIRECT-INJECTION DIESEL ENGINES--PART II: COMBUSTION CHAMBER DESIGN AND FUEL SPRAY GEOMETRY AND ADDITIONAL AIR AND GLOW PLUG AS A STARTING AID

A study was performed to evaluate the influence of combustion chamber design and fuel spray geometry on cold startability. High-squish toroidal, high-squish bowl, and Mexican hat-type combustion chambers were tested. In each case, the effects of fuel-air mixing process on cold startability was studied at different starting temperatures and injection timings. Cold startability aids, such as additional air for starting purposes and glow plugs, were tested with each of the above combustion chambers. Chamber designs with high squish and swirl and fuel impingement on the walls were found to be undesirable for good cold startability. Improved cold startability resulted from locally non-uniform air-fuel ratios with a well organized air swirl-fuel spray pattern. Glow plugs were found to be desirable for improved cold startability.

  • Supplemental Notes:
    • A Worldwide View of Diesel Combustion Emissions and Analysis, P-130. International Off-Highway Meeting and Exposition Milwaukee, Wisconsin, September 12-15, 1983.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Phatak, R
    • Nakamura, T
  • Publication Date: 1983-9

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00382415
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Files: HSL, USDOT
  • Created Date: Mar 30 1984 12:00AM