Affiliation:
1. Federal State Unitary Enterprise “Central Scientific Research Automobile and Automotive Engines Institute” (FSUE “NAMI”)
Abstract
This is the second part of the research work under the general title “On fuel and deposits” devoted to study of peculiarities of deposit formation in the internal combustion engine (ICE) and to the role of fuel in this process. The fact that the group composition of gasoline, especially the presence of olefinic and aromatic hydrocarbons (HCs), significantly affects the intensity of both “cold” and “hot” deposits is known and described by many researchers. The authors just contributed the results of their research to this fund having analysed the interrelation of physical and chemical properties of components of the main HC groups that make up the fuel compositions of gasoline and diesel fuels – alkanes (paraffins), cycloalkanes (naphthenes), arenes (aromatic HCs) and alkenes (olefins). Experimental studies of specially prepared gasoline devoid of the olefin component have been performed. The result was somewhat unexpected – the intensity of deposits on the intake valves had reduced fivefold. To some extent, this exonerates aromatic HCs from “the charge” that they are the main “supplier” of building material for formation of deposits on the intake valves. At the same time, it has been shown that the mass of deposits in the chamber was approximately the same when the engine was running on the base and olefin-free gasoline. Therefore, this clears olefinic HCs of the “suspicion” that they are responsible for the carbon residue formation in the combustion chamber, and makes it reasonable to think that it is aromatic HCs that are the “supplier” of building material for formation of carbon residue on the pistons and walls of the combustion chamber.
Publisher
FSUE Central Scientific Research Automobile and Automotive Engines Institute (FSUE NAMI)
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