In an effort to improve the tradeoff between fuel economy and emissions in the rotary combustion engine, research was undertaken to identify unburned hydrocarbon sources in the exhaust. Flame photography was used in conjunction with extensive time-resolved exhaust gas sampling. Effects of air/fuel ratio, engine load, residual gas, and engine speed on combustion and hydrocarbon emissions were examined. At lean air/fuel ratios, flame extinction in the combustion chamber's trailing portion was an important source of exahust hydrocarbons; the importance of flame extinction was diminished at richer air/fuel ratios. At the richer air/fuel ratios, apex seal leakage appeared to be the dominant hydrocarbon source. Apex seal leakage was also significant at leaner air/fuel ratios. The earlier occurrence of peak time-resolved hydrocarbon concentration with increased apex seal leakage was probably the result of a more energetic jet of linkage gases which projected further forward into the exhausting combustion chamber. The findings indicate that the diagnostic use of time-resolved data is worthwhile, particularly when interpreted in combination with flame photography.

  • Availability:
  • Supplemental Notes:
    • Presented at SAE International Fuels and Lubricants Meeting, Toronto, 13-16 November 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Bayer, R J
    • DeNagel, S F
    • Steiner, J C
  • Publication Date: 1978

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00399222
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: SAE 780965, HS-025 908U
  • Files: HSL, USDOT
  • Created Date: Oct 31 1985 12:00AM