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OIL RHEOLOGY ADJACENTTO THE SCRAPER RING OF A DIESEL ENGINE by DENNIS CHARLES LOGAN B.S. Computer Science, University ofKansas (1981) SUBMITTED TO THE DEPARTMENT OF OCEAN ENGINEERING IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREES OF MASTER OF SCIENCE IN NAVAL ARCHJTECTURE/MARINE ENGINEERING and MASTER OF SCIENCE IN MECHANICAL ENGINEERING at the MASSACHUSETTS INSTITUTE OFTECHNOLOGY June, 1991 © Dennis Charles Logan, 1991. All rights reserved. The author hereby grants to MJT and the U.S.Government permission to reproduce and to distribute copies ofthis thesis document in whole or in part. ABSTRACT OIL RHEOLOGY ADJACENTTO THE SCRAPER RING OF A DIESEL ENGINE by DENNIS CHARLES LOGAN Submitted to the Department ofOcean Engineering in partial fulfillment ofthe requirements forthe degrees ofMasterofScience in Naval Architecture/Marine Engineering and Master ofScience in Mechanical Engineering. ABSTRACT Several recent experiments have been made to determine lubricant flow patterns A in engine journal bearings. laser fluorescence technique in use at the Massachusetts Institute ofTechnology allows accurate data collection ofthe oil film thickness on the ring pack ofaproduction diesel engine. The data collected from the Kubota EA300N IDI engine consisted offive different types oflubricant—two single- grades, two multi-grades, and a synthetic multi-grade. The data was analyzed and it was found that while oil cross-flow circumferentially around the scraper ring is not present in fired cases, it is present in the motored cases. In addition, oil flow under the ring was evaluated with results consistent with previous observations and the flows observed suggest that the oil flow is between the ring and liner. Finally, a model for upstrokes that predicts the inlet wetting height forvarying ring load was evaluated with positive results. Thesis Supervisor: Dr. David P. Hoult Title: SeniorResearchAssociate Department ofMechanical Engineering ACKNOWLEDGEMENTS I would like to dedicate this work to my wife, Lisa. Without her, my job as graduate student, husband and father of three young girls (two in diapers) would have been simply impossible. Her support was invaluable. I am also grateful to Dr. Hoult for his guidance, patience and understanding during this research while I completed my primary master's degree in Ocean Engineering for the US Navy. Jim "Spud" Azzola also deserves recognition for editing this paper and forexplaining all the complicated details in "sailor's" terms. Many thanks to my mother-in-law, Peggy Volmar, for all her assistance in extreme times ofneed. Lastly, I would like to thank my parents Chuck and Darlene for their contribution ofa Macintosh SE (the best computer for windows!) which allowed me to do much ofthe work at home nearthe family.