PREDICTION OF IN-CYLINDER GAS MOTION IN ENGINES BY AN ENERGY METHOD

A simple new method to predict in-cylinder gas motion during the compression stroke is presented for both flat piston and bowl-in-piston type combustion chambers. The method is principally based on the decay law of kinetic energy of the gas flow in an engine cylinder. Comparison of predicted and measured values shows fairly good agreement for different engine variables. Calculations for a flat piston type combustion chamber show that the velocity at TDC (top dead center) varies proportionally to the 1.15th power of the engine speed and to the -0.50th power of the compression ratio (CR). For the bowl-in-piston type combustion chamber, the ratio of the velocity in the bowl at TDC to that at the intake valve closure increases with a decrease in the CR, initial velocity, height of the bump clearance, and combustion bowl diameter, and with an increase in the engine speed.

• Supplemental Notes:
  • Published in HS-030 302 (SAE-SP-468), "New Diesel Engines, Combustion, and Emissions Research in Japan," Warrendale, Pennsylvania, 1980, pp 175-88. Presented at the SAE International Off-Highway Meeting and Exposition, Milwaukee, 8-11 September 1980.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • KIDO, H
  • Wakuri, Y
  • ONO, S
  • Murase, E
• Publication Date: 1980

Media Info

• Features: References;
• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Combustion chambers; Energy; Engines
• Old TRIS Terms: In-cylinder gas motion
• Subject Areas: Energy; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00380117
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 800985, HS-030 314
• Files: HSL, USDOT
• Created Date: Dec 30 1983 12:00AM