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This paper presents research results of the working processes in aviation combined gas-turbine engine equipped with solid oxide fuel cells (SOFC). It is shown that the efficiency of the engine is higher than the initial gas-turbine one, and it significantly increases in the use of alternative fuels (liquefied natural gas or liquid hydrogen). However volume-mass parameters of the new engine are worse than that of the gas turbine, but when using the promising technologies of SOFC production development of the aviation engines with SOFC is possible.

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