Impact of Blow-By Gas and Endgap Ring Position on the Variations of Particle Emissions in Gasoline Engines

Vincent Berthome, David Chalet and Jean-François Hetet
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Vincent Berthome: Ecole Centrale de Nantes, LHEEA Lab. (ECN/CNRS), 44321 Nantes, France
David Chalet: Ecole Centrale de Nantes, LHEEA Lab. (ECN/CNRS), 44321 Nantes, France
Jean-François Hetet: Ecole Centrale de Nantes, LHEEA Lab. (ECN/CNRS), 44321 Nantes, France

Energies, 2021, vol. 14, issue 22, 1-16

Abstract: Particulate emission from internal combustion engines is a complex phenomenon that needs to be understood in order to identify its main factors. To this end, it appears necessary to study the impact of unburned gases, called blow-by gases, which are reinjected into the engine intake system. A series of transient tests demonstrate their significant contribution since the particle emissions of spark-ignition engines are 1.5 times higher than those of an engine without blow-by with a standard deviation 1.5 times greater. After analysis, it is found that the decanter is not effective enough to remove completely the oil from the gases. Tests without blow-by gases also have the advantage of having a lower disparity, and therefore of being more repeatable. It appears that the position of the “endgap” formed by the first two rings has a significant impact on the amount of oil transported towards the combustion chamber by the backflow, and consequently on the variation of particle emissions. For this engine and for this transient, 57% of the particulate emissions are related to the equivalence ratio, while 31% are directly related to the ability of the decanter to remove the oil of the blowby gases and 12% of the emissions come from the backflow. The novelty of this work is to relate the particles fluctuation to the position of the endgap ring.

Keywords: blow-by; backflow; particles; gasoline; engine; decanter; oil; transient; endgap (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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