IGTC-49 The Thermal Degradation of Aviation Fuels in Jet Engine Injector Feed-Arms : Part 1 Results from a Full-Scale Rig(Session B-2 COMBUSTION II)

概要

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A rig has been constructed to measure the fouling of model gas-turbine injector-feed-arms by fuel thermal degradation. Deposition shows two stages: an inhibition period on clean steel surfaces, followed by a near constant rate, which then decays at high deposit loadings. Addition of an approved metal deactivator additive (MDA) at 5.7mg/l extended the inhibition period threefold but failed to reduce the subsequent fouling rate. Thus, MDA acts to passivate clean metal surfaces but is ineffective once a deposit layer has formed. The results are compared with those from the JFTOT specification test and a Flask Oxidation Test. Changes to either the fuel flow rate or the pressure had no effect on the deposition rate. Analysis of the deposit is reported and its thermal conductivity estimated.