CHANGE IN THE MAIN INDICATORS OF OIL QUALITY IN THE OPERATION OF «AIRBUS HELICOPTERS H-145» HELICOPTERS
DOI:
https://doi.org/10.15421/jchemtech.v31i3.286038Keywords:
synthetic oil Mobil Jet Oil 254; mineral oil MK-8P; quality indicators; kinematic viscosity; total alkalinity number; additives; Airbus Н-145 Helicopter.Abstract
The operating conditions of synthetic Mobil Jet Oil 254 and mineral MK-8P oil in the turboprop engines of Airbus Н-145 helicopters were analyzed. The study showed that the temperature in the nodes of the mechanisms can reach
150-200 °C during operation, which leads to changes in the physico-chemical and operational indicators of the quality of lubricating materials. The dynamics of changes of the kinematic viscosity and the total base number was studied. The change in kinematic viscosity for 300 h of oils’ working time in the helicopter at the standard measurement temperature of 100 °C is shown. It is about 5 % for synthetic Mobil Jet Oil 254 and more than 18 % for mineral oil MK-8P. The change of kinematic viscosity at the negative standard temperature of its measurement (-40 °С) is less dependent on temperature for synthetic oil than for mineral oil. This makes Mobil Jet Oil 254 more attractive for lubricating engine mechanisms from a tribological point of view. The study showed that the base number of mineral oil MK-8P decreases by almost 50 % with increasing service life up to 300 hours and falls more sharply than synthetic Mobil Jet Oil 254, which indicates the deterioration of additives in it.
According to the performed research, it is not recommended to use MK-8P mineral oil in the lubrication system of Airbus Helicopters Н-145, as the oil is not suitable for a long time to maintain the main quality indicators when operation in the reducer. Research on changes in the quality of oils in the process of their real operation in the lubrication system of helicopters is relevant in terms of providing recommendations on the timing of their replacement.
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