THE EFFECTS OF CHARGE DILUTION ON COMBUSTION AND ITS IMPROVEMENT-FLAME PHOTOGRAPH STUDY

Some methods of analyzing combustion phenomena in a single-cylinder engine (27.1 CID) with charge dilution were tried. Multiple ionization probes roughly indicate the pattern of flame propagation, but details of the flame, especially charge dilution, cannot be measured by this method. Flame photographs, on the other hand, showed clearly the effects of combustion chamber design on flame propagation and its cyclic dispersion. The effects of combustion chamber configuration, ignition energy and spark duration, ignition timing, composition of diluent gas, air-fuel ratio, and mixture homogeneity were examined. Mass burnt fraction was calculated. A combustion chamber having high turbulence and a rich air-fuel ratio promoted the initial flame propagation and flame speed and improved cyclic dispersion. High turbulence design was effective for improvement of car surge caused by EGR, and this was confirmed by actual driving on the road. /GMRL/

• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Nakanishi, K
  • Hirano, T
• Publication Date: 1975-2

Media Info

• Pagination: 16 p.

Subject/Index Terms

• TRT Terms: Analysis; Combustion; Combustion chambers; Design; Dilution; Engines; Flames; Fuel air mixtures; Ignition; Photography
• Uncontrolled Terms: Air fuel ratio
• Old TRIS Terms: Charge /electric/
• Subject Areas: Design; Highways; Safety and Human Factors; Vehicles and Equipment;

Filing Info

• Accession Number: 00098468
• Record Type: Publication
• Report/Paper Numbers: SAE #750054
• Files: TRIS
• Created Date: Sep 30 1975 12:00AM