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Knock Prevention of Gas SI Engine by Adjunction of Inert Gases to the Fuel

[+] Author Affiliations
Guillaume Brecq, Jérôme Bellettre, Mohand Tazerout

Ecole des Mines de Nantes, Nantes Cedex, France

Thomas Muller

Gaz de France, St Denis la Plaine Cedex, France

Paper No. IJPGC2002-26112, pp. 997-1004; 8 pages
  • 2002 International Joint Power Generation Conference
  • 2002 International Joint Power Generation Conference
  • Scottsdale, Arizona, USA, June 24–26, 2002
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-3617-7 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME


This work focuses on the prevention from knock in the case of SI engines supplied by natural gas network. The effect of two inert gases (N2 and CO2 ) adjunction is experimentally studied. The added quantities are between 0% and 25% in volume for N2 and between 0% and 15% for CO2 . A significant increase of the Knock Limited Spark Timing (KLST) is measured in all the cases. A twice-higher augmentation is noted when CO2 is added compared to N2 for an equivalent volumetric concentration. The overall augmentation varies between +1 to +6 °CA depending on the operation. Finally, a law for predicting the KLST augmentation implied by the adjunction of inert gases is deduced from all the measurements.

Copyright © 2002 by ASME



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