MEASUREMENTS AND PREDICTIONS OF THE PRECOMBUSTION FLUID MOTION AND COMBUSTION RATES IN A SPARK IGNITION ENGINE

Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured in a motored research engine. The compression of complex bulk motions created during induction produces turbulence as the piston approaches top dead center. The turbulence field is shown to be isotropic but nonhomogeneous. A zero-dimensional computer simulation based on an averaged k-epsilon model is shown to adequately predict the decay of turbulence at a point in the flow after the production phase is completed. Cylinder pressure measurements were recorded for homogeneous stoichiometric combustion for a range of engine speeds and ignition locations. A two-zone (burned and unburned gases) thermodynamic model accurately predicts the measured pressure histories when the turbulence results determined from the motored tests are used to establish initial conditions for the combustion model.

  • Availability:
  • Supplemental Notes:
    • 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:
    • Witze, P O
    • Martin, J K
    • Borgnakke, C
  • Publication Date: 1983

Media Info

  • Features: Appendices; Figures; References;
  • Pagination: 11 p.
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00389459
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 831697, HS-036 814
  • Files: HSL, USDOT
  • Created Date: Oct 30 1984 12:00AM