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Title: Direct Measurement and Chemical Speciation of Top Ring Zone Liquid During Engine Operation

The present manuscript consists of proof of concept experiments involving direct measurements and detailed chemical speciation from the top ring zone of a running engine. The work uses a naturally aspirated single cylinder utility engine that has been modified to allow direct liquid sample acquisition from behind the top ring. Samples were analyzed and spectated using gas chromatographic techniques. Results show that the liquid mixture in the top ring zone is neither neat lubricant nor fuel but a combination of the two with unique chemical properties. At the tested steady state no-load operating condition, the chemical species of the top ring zone liquid were found to be highly dependent on boiling point, where both low reactivity higher boiling point fuel species and lubricant are observed to be the dominant constituents. The results show that at least for the tested condition, approximately 25% of the top ring zone is comprised of gasoline fuel like molecules, which are dominated by high octane number aromatic species, while the remainder of the liquid is comprised of lubricant like species.
 [1] ;  [2] ;  [1]
  1. ORNL
  2. University of Alabama, Tuscaloosa
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Resource Relation:
Conference: SAE World Congress, Detroit, MI, USA, 20150413, 20150416
Research Org:
Oak Ridge National Laboratory (ORNL); Fuels, Engines and Emissions Research Center
Sponsoring Org:
ORNL LDRD Seed-Money
Country of Publication:
United States