Abstract
The effects of elevated fuel temperatures on the performance and emissions of a Rolls-Royce 501K combustor with a modified fuel injector designed to handle two-phase flow is investigated in this study. A series of tests were run using Jet-A fuel at ambient, 250°F, 450°F, and 600°F fuel temperatures. The influence of the new fuel injector design was compared with previous collected test data using a legacy 501K fuel injector. In order to mitigate autoxidative coking, nitrogen sparging was employed to remove dissolved oxygen from the fuel during high temperature tests. Oxygen levels in the fuel prior to heating were on average less than 0.2% of fully saturated values. At the highest fuel temperatures, test conditions with combustion pressures below the vaporization pressure of the fuel led to lower combustion efficiencies most likely due to flashing in the injector. During all test conditions, high frequency pressure measurements and emissions samples including unburned hydrocarbons, carbon monoxide, and NOx were recorded in addition to conventional pressure and temperature measurements. The trends in combustion efficiency and levels of emissions due to increasing fuel temperatures are discussed in this paper.
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