Accession Number : ADA297747

Title :   Effect of Fuel Composition and Prestressing on Lubricity.

Descriptive Note : Interim rept. Oct 92-Mar 95,,

Corporate Author : SOUTHWEST RESEARCH INST SAN ANTONIO TX TARDEC FUELS AND LUBRICANTS RESEARCH F ACILITY

Personal Author(s) : Lacey, P. I. ; Westbrook, S. R.

PDF Url : ADA297747

Report Date : AUG 1995

Pagination or Media Count : 67

Abstract : Fuel lubricity--or the ability of the fuel to prevent wear during sliding-is sensitive to chemical composition. At present, increasingly severe fuel specifications are being implemented to minimize exhaust emissions. The refinery processes needed to achieve these goals are inadvertently removing many of the surface-active components necessary for wear resistance. To compound this effect, engine operating conditions are becoming more severe; fuel injection pressures are increasing dramatically, while uncooled engines that use the fuel as a heat sink are also being investigated. The present study investigates the relationship between previously validated laboratory-scale wear tests and various fuels' parameters. In general, fuel lubricity is found to be adversely affected by decreasing sulfur and aromatics content, and appears to be most closely related to diaromatics. Laboratory wear tests and full-scale equipment tests were performed to define the effects of operating temperature and thermal prestressing of the fuel. The effects of temperature on wear appear to be fuel composition sensitive. Indeed, the corrosion inhibitor additives tested had little effect at high temperatures. As a result, it is likely that conventional laboratory-scale wear tests performed at room temperature may not fully reflect real-world operating conditions. (AN)

Descriptors :   *SULFUR, *JET ENGINE FUELS, *DIESEL FUELS, *LUBRICATION, TEST AND EVALUATION, THERMAL PROPERTIES, EMISSION, SPECIFICATIONS, PARAMETERS, HIGH TEMPERATURE, CORROSION INHIBITION, ROOM TEMPERATURE, CHEMICAL COMPOSITION, CORRELATION, MILITARY APPLICATIONS, AROMATIC HYDROCARBONS, SURFACE ACTIVE SUBSTANCES, THERMAL CYCLING TESTS, THERMAL STRESSES, KEROSENE, HEAT SINKS, WEAR RESISTANCE, REFINERIES, COMPRESSION IGNITION ENGINES, FUEL INJECTION, PRESTRESSING, EXHAUST GASES, FUEL ADDITIVES.

Subject Categories : Fuels

Distribution Statement : APPROVED FOR PUBLIC RELEASE