EFFECTS OF ENGINE VARIABLES ON TURBULENCE IN A SPARK- IGNITION ENGINE

Measurements of turbulence within the cylinder of a motored CFR engine were taken with a hot-wire anemometer. Tests were conducted over a range of engine speeds, volumetric efficiencies, and compression ratios with both shrouded and nonshrouded intake valves. Data were processed digitally using both ensemble- and time-averaging techniques. Mean velocities, turbulent intensities, and turbulent micro and integral scales were computed. A nonstationary time-averaged analysis was found to give consistent and physically reasonable results. The turbulence which exists near TDC of compression was found to be isotropic, with both its intensity and scale determined by the intake process. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Lancaster, D R
• Publication Date: 1976-2

Media Info

• Pagination: 18 p.

Subject/Index Terms

• TRT Terms: Anemometers; Compression; Economic efficiency; Engines; Information processing; Isotropy; Machine valves; Spark ignition engines; Speed; Turbulence; Variables; Velocity; Volumetric analysis
• Uncontrolled Terms: Cylinders; Efficiency
• Old TRIS Terms: Compression ratio; Hot wire anemometers
• Subject Areas: Economics; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00139738
• Record Type: Publication
• Report/Paper Numbers: SAE #760159
• Files: TRIS
• Created Date: Oct 6 1976 12:00AM