This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Effects of Combustion Chamber Design and Compression Ratio on Emissions, Fuel Economy and Octain Number Requirement
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1977 by SAE International in United States
Annotation ability available
Four combustion chamber designs and three compression ratios (8:1, 9:1, and 10:1) were investigated for their emission, fuel economy, and octane number requirement characteristics using a 1.6 L (96.9 CID) 4-cyl engine. Time resolved measurement of hydrocarbon emissions was carried out to clarify the reason for differences in tail pipe emission between these combustion chambers. The “High Turbulence Type” combustion chambers, which included swirl (piston swirl) and/or squish, indicated better fuel economy under emission and octane number requirement constraints. The HC emission of the combustion chamber with squish and swirl was lower than that of the combustion chambers with squish alone. The time resolved measurement of HC emissions explained the difference in the exhaust process of these unburned hydrocarbons. A compression ratio of 9:1 was the best compromise for optimum fuel economy with this high turbulence combustion chamber, under the target constraints for HC and NOx emissions assumed for these tests.
CitationMatsumoto, K., Inoue, T., Nakanishi, K., and Okumura, T., "The Effects of Combustion Chamber Design and Compression Ratio on Emissions, Fuel Economy and Octain Number Requirement," SAE Technical Paper 770193, 1977, https://doi.org/10.4271/770193.
- Schwarzbauer G. “Verbrennungsablaut and Stickoxidbildung in Ottomotor” MTZ 34 1973 3 77 84
- Huber W. Prescher Karlheinz “Motorinterne Massnahem zur Verringerung der Schadstoff emission des Ottomotors” MTZ 37 1976 4 141 148
- Nakanishi K. Hirano T. Inoue T. Ohigashi S. “The Effects of Charge Dilution on Combustion and Its Improvement - Flame Photograph Study” Paper No. 750054 SAE Automotive Engineering Congress Detroit February 1975
- Blumburg Paul N. “Powertrain Simulation: A tool for the Design and Evaluation of Engine Control Strategies in Vehicles” Paper No. 760158 SAE Automotive Engineering Congress Detroit February 1976
- Gumbleton James J. Bolton Robert A. Lang H. Walter “Optimizing Engine Parameters with Exhaust Gas Recirculation” Paper No. 740104 SAE Automotive Engineering Congress Detroit February 1974
- Kaneko Y. Kobayashi H. Komagome R. “The Effects of Exhaust Gas Reciruclation and Residual Gas on Engine Emissions and Fuel Economy” Paper No. 750414 SAE Automotive Engineering Congress Detroit February 1975
- Ohigashi S. Hamamoto Y. Tanabe S. “Swirl - Its Measurement and Effect on Combustion in a Diesel Engine” Inst. Mech. Engineerings 1971
- Tabaczynski R. J. Heywood J. B. Keck J. C. “Time - Resolved Measurements of Hydrocarbon Mass Flow Rate in the Exhaust of a Spark - Ignition Engine” SAE Paper No. 720112
- Tabaczynski R. J. Hoult D. P. Keck J. C. “High Reynolds Number Flow in a Moving Corner” J. Fluid Mech. 1970 42 249 255