Abstract
An experimental study of fuel fouling using optical measurement methods was performed. These measurements included absorption from 350 to 750 nm, scattering at 514.5 nm, and fluorescence using a probe wavelength of 514.5 nm. Measurements were performed using a constant-temperature heating system which exited into an optical cell. Each of the measurements proved useful in monitoring changes in the test fuel, JP-4, at test temperatures up to 775 K and pressures of 400 psig. Absorption measurements demonstrated both molecular changes in the fuel composition and a marked increase in the particulate present in the flow as a result of thermal stress. Scattering measurements indicated room temperature fuel to contain particulate with average diameters greater than 0.1 [mu]m while thermally stressed fuel contained much larger concentrations of particulate with sizes below 0.6 [mu]m. This paper clearly illustrates the possibilities of using optical methods for monitoring the fuel fouling process.
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