Kalenskii

The authors made an assessment of economic and mass-overall characteristics of a power plant in a long distance aircraft using cryogenic fuel. The scheme consists of two dual-flow turbojet engines and a remote propfan mounted in the rear fuselage the thrust of which compensates aerodynamic resistance of the fuselage. The authors examined five design maps of the remote propfan drive, including the schemes using a fuel cell power plant. They estimated characteristics of these schemes at different levels of power ratio of cruise engines and the external propfan. A comparative analysis of the mechanical, electrical and gas-dynamic drive of the remote propfan was made. The authors present conclusions on practical schemes of an integrated circuit power plant and their application.

 Existent estimation procedure for tractive-economical and mass-dimensional characteristics of turbofan engines was improved. The authors consider two schemes of hybrid turbofan engines with additional power input to fan spindle from an electric motor supplied with accumulators or fuel elements. For the first time in Russia characteristics of these schemes were evaluated at different capacity ratios of the fan drive between a low-pressure turbine and an electric drive. The authors present the results of thermodynamic calculations, speed and throttle characteristics of hybrid turbofan engines of both schemes. Conclusions were made on reasonable ranges of capacity ratios between the low-pressure turbine and the electric drive which are used for the fan drive.