Accession Number : ADA188874

Title :   Comparison of JFTOT Heater Tube Deposit Rating Methods for the Evaluation of Fuel Thermal Stability.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Morris, Robert E ; Hazeltt, Robert N ; McIlvaine, C L , III

PDF Url : ADA188874

Report Date : 29 Dec 1987

Pagination or Media Count : 17

Abstract : Quantification of deposits formed of heated metal surfaces is desirable for the evaluation of thermal stability by the JFTOT procedure. Empirical methods widely employed entail either visual comparisons or measurements of reflected light (TDR), both of which are sensitive to deposit color. We have examined these and several other measurement techniques for JFTOT heater tubes and have found that measurements of total carbon content by combustion were the most reliable. Two novel techniques, based on measurements of dielectric strength and interference effects of monochromatic light have been examined. It was found that the dielectric and interference methods correlated well with the combustion analyses and each other, while the TDR often yielded misleading results. The correlations between the various methods will be discussed in addition to the consequence of method choice on the interpretation of experimental data. Keywords: Jet fuels, Thermal oxidation stability, Tube deposit rating methods.

Descriptors :   *COMBUSTION, *HEAT, *JET ENGINE FUELS, *THERMAL STABILITY, CARBON, COLORS, DEPOSITS, DIELECTRICS, EXPERIMENTAL DATA, FUELS, INTERFERENCE, MEASUREMENT, METALS, METHODOLOGY, MONOCHROMATIC LIGHT, OXIDATION, RATINGS, REFLECTION, SENSITIVITY, SURFACES, TEST METHODS, THERMOCHEMISTRY, TUBES

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE