A NEW METHOD TO DETERMINE FLOW PHENOMENA IN INTERNAL COMBUSTION ENGINES

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

• Features: Figures; References;
• Pagination: p. 4.17
• Serial:
  • Publication of: Society of Automotive Engineers, Incorporated
  • Publisher: Society of Automotive Engineers (SAE)

Subject/Index Terms

• TRT Terms: Air; Anemometry; Development; Diesel engines; Flow; Internal combustion engines; Mathematical models; Otto cycle engines; Research
• Uncontrolled Terms: Air flow; Research and development
• Subject Areas: Research; Safety and Human Factors;

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