Investigation of Sliding-Surface Bearings of Screw Pumps Utilized on the Navy Distillate Fuel Oil Conversion Program.

摘要

The report describes the evaluation of IMO pumps used in Naval fuel oil systems. Conversion to distillate fuels resulted in high failure rates due to poor lubrication and high fuel contamination. The effort primarily concentrated on the analytical study of the bearings when using NSFO and distillate-type fuels, i.e.,ND, DFM and JP-5. The analytical approach developed allows evaluation of bearing performance when the mode of the bearing operation is either full-film hydrodynamic or mixed film. With regard to the mixed-film evaluation,the criterion of boundary friction energy density was selected. This criterion is a measure of bearing distress as provided by the product of metal-to-metal contact friction force per unit area times sliding velocity. Forty different pump models belonging to five different pump series were evaluated. (Modified author abstract)