An annulus filler is provided for mounting to a rotor disc of a gas turbine engine and bridging the gap between two adjacent blades attached to the rotor disc. The annulus filler is substantially entirely formed from a polymer matrix composite material. It has an outer lid which defines an airflow s
An annulus filler is provided for mounting to a rotor disc of a gas turbine engine and bridging the gap between two adjacent blades attached to the rotor disc. The annulus filler is substantially entirely formed from a polymer matrix composite material. It has an outer lid which defines an airflow surface for air being drawn through the engine in an axial airflow direction, and a support structure which is connectable to the rotor disc to support the lid on the rotor disc. The support structure has two support walls extending from opposing lateral sides of the lid to an attachment strap for receiving a hook on the rotor disc, the attachment strap bridging the support walls. In use, under centrifugal loads, the opposing support walls resiliently deform to allow outward radial movement of the lid. Each support wall is thickened in a region neighboring the attachment strap.
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1. An annulus filler for mounting to a rotor disc of a gas turbine engine and bridging the gap between two adjacent blades attached to the rotor disc, the annulus filler being substantially entirely formed from a polymer matrix composite material, the annulus filler comprising: an outer lid which de
1. An annulus filler for mounting to a rotor disc of a gas turbine engine and bridging the gap between two adjacent blades attached to the rotor disc, the annulus filler being substantially entirely formed from a polymer matrix composite material, the annulus filler comprising: an outer lid which defines an airflow surface for air being drawn through the engine in an axial airflow direction; anda support structure which is connectable to the rotor disc to support the outer lid on the rotor disc, the support structure having two support walls extending from opposing lateral sides of the outer lid to an attachment strap for receiving a hook on the rotor disc, the attachment strap bridging the support walls, and, in use under centrifugal loads, the support walls resiliently deforming to allow outward radial movement of the outer lid, wherein: each support wall is thickened in a region neighbouring the attachment strap; andthe hook has laterally spaced side faces and each support wall is arranged to pass around a respective side face such that, when the support structure is connected to the rotor disc, the attachment strap is substantially prevented from sliding tangentially relative to the hook. 2. The annulus filler of claim 1, wherein the thickened region ends at a radial distance from the attachment strap which is no more than 40% of a total radial distance from the attachment strap to the outer lid. 3. The annulus filler of claim 1, wherein the thickened region ends at a radial distance from the attachment strap which is at least 5% of a total radial distance from the attachment strap to the outer lid. 4. The annulus filler of claim 1, wherein each support wall is at least 20% thicker in the thickened region than in regions of the support wall radially outside the thickened region. 5. The annulus filler of claim 1, wherein each support wall is at most 100% thicker in the thickened region than in regions of the support wall radially outside the thickened region. 6. The annulus filler of claim 1, wherein at least in regions neighbouring the support walls, the attachment strap is at least as thick as the thickened regions of the support walls. 7. The annulus filler of claim 1, wherein the attachment strap has a composite material first part which is integrally formed with the composite material of the support walls, and further has a second part in the form of a pad which is carried by the first part and is engageable with the hook of the rotor disc, the pad being formed from a different material to the composite material first part. 8. The annulus filler of claim 7, wherein the pad is a galvanic corrosion barrier to prevent or reduce galvanic corrosion between the composite material of the support structure the rotor disc. 9. The annulus filler of claim 7, wherein the pad has wings which extend along the support walls to provide some or all of the thickening in the thickened regions of the support walls. 10. The annulus filler of claim 7, wherein the composite material first part bridges the support walls. 11. The annulus filler of claim 7, wherein the composite material first part is formed by two composite material side portions, each integrally formed with the composite material of a respective one of the support walls, the pad bridging a gap between the side portions. 12. The annulus filler of claim 1, wherein the support walls of the support structure resiliently deform by flexing inwards towards each other to allow outward radial movement of the outer lid. 13. The annulus filler of claim 1, wherein the polymer matrix composite material is a carbon fibre composite material. 14. The annulus filler of claim 1, for mounting to a fan disc and bridging the gap between two adjacent fan blades attached to the fan disc. 15. The annulus filler of claim 1, having two of the support structures, one supporting a front of the outer lid and another supporting a rear of the outer lid. 16. The annulus filler of claim 1, wherein the support structure supports a rear of the outer lid, and each support wall has a concave rear edge which extends rearwardly and radially outwardly from a rear of the attachment strap towards a trailing edge of the outer lid, each rear edge having a first curved section proximal the attachment strap, a second curved section proximal the trailing edge and a substantially straight section therebetween. 17. A stage for a gas turbine engine comprising: a rotor disc;a circumferential row of spaced apart blades attached to the rotor disc; anda plurality of annulus fillers according to claim 1 bridging gaps between adjacent blades. 18. A gas turbine engine having the stage of claim 17. 19. An annulus filler for mounting to a rotor disc of a gas turbine engine and bridging the gap between two adjacent blades attached to the rotor disc, the annulus filler being substantially entirely formed from a polymer matrix composite material, the annulus filler having: an outer lid which defines an airflow surface for air being drawn through the engine in an axial airflow direction, anda support structure which is connectable to the rotor disc to support the lid on the rotor disc, the support structure having two support walls extending from opposing lateral sides of the lid to an attachment strap for receiving a hook on the rotor disc, the attachment strap bridging the support walls;wherein the hook has laterally spaced side faces and each support wall is arranged to pass around a respective side face such that, when the support structure is connected to the rotor disc, the attachment strap is substantially prevented from sliding tangentially relative to the hook. 20. The annulus filler of claim 19, wherein the attachment strap has a composite material first part which is integrally formed with the composite material of the support walls, and further has a second part in the form of a pad which is carried by the first part and is engageable with the hook of the rotor disc, the pad being formed from a different material to the composite material first part. 21. The annulus filler of claim 20, wherein the pad is a galvanic corrosion barrier to prevent or reduce galvanic corrosion between the composite material of the support structure the rotor disc. 22. The annulus filler of claim 20, wherein the pad has wings which extend along the support walls to provide some or all of the thickening in the thickened regions of the support walls. 23. The annulus filler of claim 20, wherein the composite material first part bridges the support walls. 24. The annulus filler of claim 20, wherein the composite material first part is formed by two composite material side portions, each integrally formed with the composite material of a respective one of the support walls, the pad bridging a gap between the side portions. 25. The annulus filler of claim 19, wherein the support walls of the support structure resiliently deform by flexing inwards towards each other to allow outward radial movement of the outer lid.
Lamboy, Jorge Orlando; Gann, Matthew Glen; Kray, Nicholas Joseph; Pauley, Gerald Alexander; Wilkin, II, Daniel Allen; Xie, Ming, Non-integral fan blade platform.
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