Thermolysis mechanism of fuel components for jet engines

Механизм термолиза компонентов топлив для реактивных двигателей

УДК 543.876:665.743.3

DOI: 10.32758/2071-5951-2020-0-04-40-44

Thermolysis mechanism of fuel components for jet engines

Anisimov D.I., Juravleva V.D., Lihterova N.M.

(Federal Autonomous Enterprise «The 25-th State Research Institute of Himmotology, Ministry of Defence of Russian Federation», Moscow)

Keywords: propensity to form deposits, fuel injectors, aviation kerosene, thermal oxidation stability, thermolysis, oxidation mechanism, radical reactions.

Abstract

The article presents literature data on mechanisms of temperature deposits formation in fuel systems of aviation gas turbine engines. Two main ways of formation of deposits are distinguished: liquid-phase auto oxidation at low temperatures (150-360 °С) (thermo-oxidative stability), and also gas or supercritical pyrolysis and cracking at high temperatures (> 400 °С) (thermolysis). The data on the effect of antioxidants and hydroperoxides formed during thermal oxidation on thermolysis are also presented. It is shown that these mechanisms do not reflect real operating conditions of some aircraft gas-turbine engine systems, such as fuel injectors, where dissolved oxygen is most likely mixed with thermolysis. In this connection, a scheme of deposit formation, including the stages of oxygen oxidation and thermolysis, has been proposed. Based on this scheme, a gross model of deposit formation will be developed for use in a mathematical model describing the functioning of fuel channels of aircraft gas turbine engines.

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