초록 ▼

Breather air, containing oil mist, is discharged from a nacelle 4 of a gas turbine engine through an exhaust port 26 at a surface 22 of the nacelle 4. Energized air, at relatively high velocity is discharged from a clean air outlet 28, and forms a barrier between the breather air and the external su

Breather air, containing oil mist, is discharged from a nacelle 4 of a gas turbine engine through an exhaust port 26 at a surface 22 of the nacelle 4. Energized air, at relatively high velocity is discharged from a clean air outlet 28, and forms a barrier between the breather air and the external surface 22, so preventing contamination of the surface 22 by oil deposited from the breather air.

대표청구항 ▼

1. A gas turbine engine comprising a nacelle and a breather duct providing communication between a component of the engine within the nacelle and the exterior of the nacelle, the breather duct opening at the exterior of the nacelle at a circular exhaust port, and a clean air outlet being disposed ad

1. A gas turbine engine comprising a nacelle and a breather duct providing communication between a component of the engine within the nacelle and the exterior of the nacelle, the breather duct opening at the exterior of the nacelle at a circular exhaust port, and a clean air outlet being disposed adjacent the exhaust port, the clean air outlet comprising an annular slot concentric with the exhaust port, to provide, in use, a barrier of clean air between the external surface of the nacelle and a flow of breather air from the exhaust port. 2. A gas turbine engine as claimed in claim 1, in which the component is an oil lubricated component. 3. A gas turbine engine as claimed in claim 2, in which the component is a gearbox. 4. A gas turbine engine as claimed in claim 1, in which the clean air outlet is disposed at least partially downstream of the exhaust port. 5. A gas turbine engine as claimed in claim 1, in which the clean air outlet comprises a porous skin providing the external surface of the nacelle in the region of the exhaust port. 6. A gas turbine engine as claimed in claim 1, in which the clean air outlet is configured to direct clean air in a downstream direction. 7. A gas turbine engine as claimed in claim 1, in which the exhaust port and the clean air outlet are provided on a mast which projects outwardly of the nacelle. 8. A gas turbine engine as claimed in claim 1, in which, in normal operation of the engine, the flow rate of air from the clean air outlet is greater than the flow rate of air from the exhaust port. 9. A gas turbine engine as claimed in claim 1, in which the clean air is supplied to the clean air outlet from a bypass duct of the engine. 10. A gas turbine engine as claimed in claim 5, in which the clean air is supplied from the bypass duct through a fire zone of the engine.