The article discusses the possibility of improving the main characteristics (efficiency, specific thrust) of a gas turbine engine by using liquefied natural gas (LNG) as fuel. This possibility is considered on the example of using as fuel instead of aviation kerosene on PS-90A and NK-93 engines. The parameters of the engine were determined at various stages in the cruise flight mode when operating on kerosene and LNG. The parameters evaluating the fuel consumption of the engine are calculated and compared for both fuels. The performance characteristics for kerosene and LNG were evaluated in the system of the Tu-330 subsonic transport aircraft. Energy losses during storage of cryogenic fuel on board the aircraft are estimated.

Rotor vibration stands out as one of the primary causes of mechanical seal failure. However, classical dynamic seal models often would not be able to fully explaining the failure process. Therefore, the proposed dynamic model systematization, including the models developed by the authors, proves invaluable in predicting the dynamic behavior of seals during operation within specific turbomachines or explaining the causes of seal failure. The single-mass dynamic model can be used to study the operation of the contact mechanical seals and simple dry gas seals. Meanwhile, the two-mass dynamic model is used for the studding of operational processes in classical dry gas seals under complex loading. Additionally, the three-mass dynamic model finds application in studying the operation of various complex mechanical seal types. This model is used to accurately determine the range of normal operating conditions for such seal types and to identify the mechanism of leakage loss in the presence of excessive rotor vibrations.