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The Effect of Exhaust Recycle on Knock-Limited SI Engine Performance
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1975 by SAE International in United States
Annotation ability available
This paper reports on some recent work performed to establish the effectiveness of exhaust gas recycle as a knock suppressant in spark ignition engines, and to determine the effect of fuel and engine operating conditions on knock-limited engine performance and NOx emissions.
Performance was evaluated with two different fuels: ASTM isooctane and ASTM 80 octane.
With ASTM 80 octane fuel, operating near stoichiometric, the higher knock-limited compression ratio (klcr) resulted in a break mean effective pressure (bmep) which was constant for moderate recycle, falling only with high recycle rates. Brake specific fuel consumption (bsfc) decreased with recycle to a minimum, and then increased for higher recycle rates. For lean mixtures, however, bsfc increased steadily with recycle. Performance was similar with the isooctane. The performance recovery for stoichiometric and rich mixtures (low to moderate recycle) was attributed to the higher klcr and changes in the specific heat ratio. The observed degradation in performance recovery for lean mixtures and high recycle rates was due to losses associated with the lower burning rates.
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CitationHodges, J., "The Effect of Exhaust Recycle on Knock-Limited SI Engine Performance," SAE Technical Paper 750025, 1975, https://doi.org/10.4271/750025.
- Glass W. et al. “Evaluation of Exhaust Recirculation for Control of Nitrogen Oxides Emissions.” Paper 700146 presented at SAE Automotive Engineering Congress Detroit January 1970
- Quader A. “Why Intake Charge Dilution Decreases Nitric Oxide Emissions from Spark Ignition Engines.” SAE Transactions 80 1971 710009
- Komiyama K. Heywood J. “Predicting NO x Emissions and Effects of Exhaust Gas Recirculation in Spark Ignition Engines.” Paper 730475 presented at SAE National Automobile Engineering Meeting Detroit May 1973
- Wrey K. Teare J. “Shock-Tube Study of the Kinetics of Nitric Oxide at High Temperature.” Journal of Chemical Physics 36 10 May 1962
- Lavoie G. Heywood J. Keck J. “Experimental and Theoretical Study of Nitric Oxide Formation in Internal Combustion Engines.” Combustion Science and Technology 1 1970
- Taylor C. “The Internal Combustion Engine in Theory and Practice.” II M.I.T. Press 1968
- Haskell W. Bame J. “Engine Knock - An End-Gas Explosion.” SAE Transactions 74 1965 650506
- Quader A. et al. “UV Absorbance Histories and Knock in a Spark Ignited Engine.” Paper 690519 presented at SAE Mid-Year Meeting Chicago May 1969
- Bolz R. Breitwieser R. “The Effect of Compression Ratio, Cooled Exhaust Gas Mixed with Inlet Air and Inlet Air Temperature on the Knock-Limited Performance of a Full-Scale Single Cylinder Engine.” 1944
- Miller A. Suliss S. “Recycling Exhaust Gas for Suppression of Knock in Internal Combustion Engines.” Journal of American Petroleum Institute, Division of Refining 33 1953
- Dimitriades B. “Determination of Nitrogen Oxides in Auto Exhaust.” Journal of Air Pollution Control Association 17 4 April 1967
- Beaty R. Berger L. Schrenk H. “Determination of the Oxides of Nitrogen by the Phenoldisulfonic Acid Method.” February 1943
- Harrington J. Shishu R. Asik J. “A Study of Ignition System Effects on Power, Emissions, Lean Misfire Limit, and EGR Tolerance of a Single Cylinder Engine-Multiple Spark versus Conventional Single Spark Ignition.” Paper 740188 presented at SAE Automotive Engineering Congress Detroit February 1974
- Gumbleton J. Bolton R. Lang H. “Optimizing Engine Parameters with Exhaust Gas Recirculation.” Paper 740104 presented at SAE Automotive Engineering Congress Detroit February 1974