Changes in the chemical composition of aviation oils during their thermal conversion

The paper describes experimental studies of changes in the chemical composition of aviation oils during their thermal conversion. Aviation oils widely used in the aviation industry of the Republic of Belarus were taken as research objects: MS-8P, TURBONIKOIL 98 (TN 98) and TURBONIKOIL 600 (TN 600). A description of the operating conditions of oils, including thermal conditions, is provided. It is noted that, although the oils in question are thermally stable over a wide temperature range, at various stages of operation they might be overheated, leading to a quantitative change in the hydrocarbon composition. This can lead to a significant decrease in lubricating properties, the formation and accumulation of mechanical impurities in the friction unit, the formation of defects, and destruction of friction unit elements. A description of the methodology for determining the quantitative and qualitative analysis is presented. During the study, the chemical composition of the starting oils was determined, after which the oils were heated for a certain period of time. Warm-up temperatures were selected from the maximum operating temperatures at which these oils are used to the minimum flash points. For convenience, the oil components were divided into eight groups of components. An analysis of changes in the percentage of groups of components of the studied oils during their heating is presented. The effect of heating time on the component composition of these samples is shown, esters, additives and other organic compounds are determined. The results obtained can be useful in modeling the operation of friction units of aircraft engines and predicting changes in oil quality indicators under operating conditions.