Advanced Thermally Stable Jet Fuels Development Program Annual Report. Volume 3. Fuel Lubricity
Interim technical rept. Jun 1989-Oct 1990
SANDIA NATIONAL LABS ALBUQUERQUE NM
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A program to evaluate the effects of additives on JP-8 fuel lubricity at high temperatures is described. Operating temperatures to 163 C were examined, with a subsequent program goal of 315 C. Baseline data were obtained using the Ball-on-Cylinder Lubricity Evaluator BOCLE. High-temperature data were obtained with an apparatus known as the Cameron-Plint High Frequency Reciprocating Machine. The most significant effect of variables observed was a consequence of a change in wear specimen material from 52100 steel to M-50 steel--the latter considered to be representative of advanced fuel system designs. Use of M-50 wear coupons resulted in considerably reduced wear levels with only slight separation between neat or additized fuels. M-50 specimen roughness was a major influence in wear level. At finalized test conditions, a dibasic acid ester, di2-ethylhexyl adipate, was found to give the lowest wear values when used as an additive in clay-treated JP-8, although distinctions between the various additized fuels were not large.