The in-cylinder airflow has a large effect on the characteristics of a piston engine. In order to determine these flow phenomena both a mathematical model and an anemometer were developed. The compressionstroke of an i.c. engine was simulated two- and three-dimensionally with commercially available finite-difference flow programs. The initial values for this simulation were calculated through the use of a zero dimensional swirl model of the intake stroke. The swirl coefficient, needed for this calculation, was both measured on a stationary flowrig and calculated from a simulation of the airflow through the inletport. The results of the model calculations were checked with an electric discharge anemometer (EDA). EDA was developed in such a way that the air velocity is measured as a three-dimensional vector. The physical background of EDA was thoroughly investigated. Validation measurements were carried out in a motored Otto engine and a direct injection diesel engine, both motored and fired. The method developed shows considerable potential as an R and D and design tool.

  • Supplemental Notes:
    • Twentieth FISITA Congress, (SAE P-143), The Automotive Future, Volume 4, Austria, 6-11 May 1984.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • SEPPEN, J J
  • Publication Date: 1984-5

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00392571
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 845109, HS-037 468
  • Files: HSL, USDOT
  • Created Date: Feb 28 1985 12:00AM