Aeroengine fan assembly
A fan assembly of a gas turbine engine, the fan assembly includes an array of radially extending blades defining gaps therebetween and an annulus filler located within at least one gap. The annulus filler includes at least two individual bodies arranged circumferentially adjacent one another with at least one adjacent a blade, one of the bodies includes a flexible wall arranged to centrifuge outwardly against the other body thereby urging both bodies against the blades and securing them during engine operation.
1. A fan assembly of a gas turbine engine, the fan assembly comprising:
a fan disc;
an array of radially extending blades fitted into the fan disc and defining gaps therebetween; and
an annulus filler located within at least one gap, wherein said annulus filler includes at least two individual bodies arranged circumferentially adjacent one another with at least one of said bodies contacting a blade, and wherein at least one of said bodies includes a flexible wall arranged to centrifuge outwardly against an adjacent one of said bodies during engine operation, thereby urging at least the adjacent body against a blade adjacent thereto, and securing the bodies and the blade.
2. A fan assembly as claimed in claim 1 wherein there are three individual bodies arranged circumferentially adjacent one another, only two bodies are located against adjacent blades.
3. A fan assembly as claimed in claim 2 wherein the middle one of the three individual bodies includes two flexible walls each arranged to centrifuge outwardly against an adjacent body.
4. A fan assembly as claimed in claim 1 wherein the flexible wall is angled from a radial line.
5. A fan assembly as claimed in claim 1 wherein the flexible wall is arcuate with its centre of gravity circumferentially offset from a radial line and arranged to centrifuge outwardly against the other body.
6. A fan assembly as claimed in claim 1 wherein the flexible wall is bellowed or a concertina.
7. A fan assembly as claimed in claim 1 wherein the flexible wall is arranged to provide a bias against the other body thereby urging both bodies against the blades and securing them particularly when the engine is not operational.
8. A fan assembly as claimed in claim 1 wherein one of the bodies comprises a radially inner wall arranged to provide a bias against the other body thereby urging both bodies against the blades and securing them particularly when the engine in not operational.
9. A fan assembly as claimed in claim 8 wherein the radially inner wall is formed of two fingers.
10. A fan assembly as claimed in claim 1 wherein a fillet is provided radially outwardly of the body and between the body and the blade.
11. A fan assembly as claimed in claim 10 wherein the fillet is integral to the blade or body.
12. A fan assembly as claimed in claim 10 wherein the fillet defines a recess and the shape of the body compliments the recess defining sloping surfaces and respectively, thereby providing a force to urge the body against the blade.
13. A fan assembly as claimed in claim 1 wherein at least one body comprises a circumferentially extending arm at a radially outer part and which overlaps another body.
14. A fan assembly as claimed in claim 13 wherein at least one body comprises a circumferentially extending groove into which the arm engages.