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A composite annulus filler adapted to bridge the gap between two adjacent rotor blades attached to a rim of a rotor disc of a gas turbine engine. The annulus filler includes a unitary body portion having a platform which extends between the adjacent rotor blades and defines an airflow surface for ai

A composite annulus filler adapted to bridge the gap between two adjacent rotor blades attached to a rim of a rotor disc of a gas turbine engine. The annulus filler includes a unitary body portion having a platform which extends between the adjacent rotor blades and defines an airflow surface for air being drawn through the engine and a support body extending beneath the platform and terminating in a root which, in use, extends along a groove provided in the rim of the rotor disc.

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1. A composite annulus filler for bridging the gap between two adjacent rotor blades attached to a rim of a rotor disc of a gas turbine engine, the composite annulus filler comprising a platform which extends between the adjacent blades and defines an airflow surface for air being drawn through the

1. A composite annulus filler for bridging the gap between two adjacent rotor blades attached to a rim of a rotor disc of a gas turbine engine, the composite annulus filler comprising a platform which extends between the adjacent blades and defines an airflow surface for air being drawn through the engine, and a support body extending beneath the platform and terminating in a root which, in use, extends along a groove provided in the rim of the rotor disc, the groove having a neck which prevents withdrawal of the filler root through the neck in a radially outward direction of the disc, andthe platform, support body and root are unitarily formed as a three dimensional braided structure that comprises the platform, the support body and the root, andwherein the three dimensional braided structure is infused with a matrix to form the composite annulus filler, wherein the support body includes first and second side walls that extend from the platform to the root, wherein a cavity is formed between the first and second side walls, and wherein the three dimensional braided structure forms an axially extending tube arranged around the cavity without axially extending seams. 2. The composite annulus filler of claim 1, wherein the braid structure is formed from silicon-carbide threads. 3. The composite annulus filler of claim 2, wherein the matrix is a silicon-carbide ceramic composite. 4. The composite annulus filler of claim 1, wherein the platform includes a top side and first and second spaced apart longitudinal edges. 5. The composite annulus filler of claim 4, wherein one of the longitudinal edges of the platform include a machined feature. 6. The composite annulus filler of claim 5, wherein the machined feature is a hemispherical recess formed in the longitudinal edge of the platform. 7. A composite annulus filler comprising a platform,a support body extending beneath the platform, andand a root extending beneath the support body,wherein the platform, support body and root are unitary and formed as a three dimensional woven structure, and wherein the three dimensional woven structure forms a tube without axially extending seams and is infused with a ceramic-containing matrix to form a ceramic matrix composite. 8. The composite annulus filler of claim 7, wherein the woven structure is formed from silicon-carbide threads. 9. The composite annulus filler of claim 7, wherein the platform of the unitary body includes a top side and first and second spaced apart longitudinal edges. 10. The composite annulus filler of claim 9, wherein one of the longitudinal edges of the platform include a machined feature. 11. The composite annulus filler of claim 10, wherein the machined feature is a hemispherical recess formed in the longitudinal edge of the platform portion. 12. The composite annulus filler of claim 7, wherein the support body includes first and second side walls that extend from the platform to the filler root. 13. The composite annulus filler of claim 12, wherein a cavity is defined by the platform, the first side wall, and the second side wall and wherein the cavity at least partially defines the tube. 14. A method for forming a composite annulus filler, the method comprising three dimensionally braiding a unitary annulus filler preform having a platform, a support body extending beneath the platform, and a root extending beneath the support body, the platform having first and second longitudinal edges, wherein the support body includes first and second side walls that extend from the platform portion to the root to form a cavity, the three dimensional braided structure forms an axially extending tube arranged around the cavity, and the tube does not include axially extending seams,placing the unitary annulus filler preform into a transfer mold,applying a composite matrix material to the unitary annulus filler preform to form the composite annulus filler, andmachining features into one of the first or second longitudinal edges of the platform of the composite annulus filler. 15. The method of claim 14, wherein the unitary annulus filler preform is braided from silicon-carbide fibers and the composite matrix material contains silicon-carbide and ceramic.