VENTILATION SYSTEM FOR BEARING OIL CAVITY Russian patent published in 2021 - IPC F01D25/16 F02C7/06 

FIELD: gas turbine engines.

SUBSTANCE: gas turbine engine contains a gas generator (66) containing a compressor section (11) and a power turbine section (65). The power turbine section (65) contains a power turbine rotor (81) supported by a power turbine shaft (93), which is not mechanically connected to the gas generator (66). The shaft (93) of the power turbine has an axial cavity (511) inside it, fluidly connected to the oil cavity (521) of the bearing, fluidly connected to the section (11) of the compressor and containing at least one bearing (106), the supporting shaft of the gas generator (66). An air vent (527) extends from said axial cavity (511) and leads to a combustion gas flow channel (515) located downstream of the power turbine rotor (81). Thus, the overall area and complexity of the gas turbine engine is reduced and maintenance is simplified.

EFFECT: improved ventilation of the bearing cavity improves engine performance under off-design conditions.

9 cl, 4 dwg