ON THE THERMAL STABILITY OF HYDROCARBON FUELS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
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The thermal stability of fuels for air-breathing jet engines was investigated in a glass placed in a bomb for determining the induction period of gasolines. The tests were made in the presence of a copper plate at 100, 150, 200, and 250C in an atmosphere rarefied with atmospheric nitrogen. In specimens of petroleum types poor in sulfur, maximum precipitation was observed at 200C and in fuels from high-sulfur petroleum types, at 150C. A reduction in the content of aromatic hydrocarbons especially bicyclic ones increases the thermal stability of fuels. When the content of paraffins is decreased and that of naphthenes increased, precipitation increases. An increase of the oxygen concentration in the oxidation atmosphere intensifies precipitation. At 150-200C, certain antioxidants reduce the formation of precipitates in fuels.