GEAR FAN-TYPE GAS-TURBINE MOTOR ARRANGEMENT Russian patent published in 2017 - IPC F02K3/06 

FIELD: engines and pumps.

SUBSTANCE: gear unit, for example an epicyclic wheel train, can be used to drive the fan section, so as to allow the fan section to rotate at a speed different from that of the turbine section. The turbine section is in fluid medium communication with the combustion chamber and comprises a fan drive turbine and a second turbine. The fan drive turbine comprises a plenty of turbine stages. The fan has a plurality of vanes rotated about an axis. The ratio of fan vanes quantity to a number of fan drive turbine stages is from 2.5 to 8.5. The fan drive turbine comprises the first backside rotor which is attached to the first shaft, and the second turbine comprises the second backside rotor which is attached to the second shaft. Axially behind the first connection between the first backside rotor and the first shaft is the first bearing assembly and axially before the second connection between the second backside rotor and the second shaft is the second bearing assembly. The second turbine has at least two stages and is capable of operating at a first pressure, and the fan drive turbine has more than two stages and is capable of operating at a second pressure which is less than the first pressure.

EFFECT: increase working characteristics and productivity by using the required combinations of the disclosed design features of the various components of the described gas turbine engine.

19 cl, 12 dwg