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A rotor assembly, for a gas turbine, has a plurality of rotor discs interconnected by an axially extending rim. The outside of the rim has a circumferential array of dovetail slots and the underside of the rim has a circumferential channel which extends radially part way into the slots, the respecti

A rotor assembly, for a gas turbine, has a plurality of rotor discs interconnected by an axially extending rim. The outside of the rim has a circumferential array of dovetail slots and the underside of the rim has a circumferential channel which extends radially part way into the slots, the respective discs thus being interconnected axially across the channel by an array of circumferentially spaced connecting portions. There is an array of blades, each blade having a blade root secured in a respective one of the dovetail slots.

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1. A rotor assembly comprising: i) a plurality of rotor discs interconnected by an axially extending rim, the outside of the rim having a circumferential array of dovetail slots and the underside of the rim having a circumferential channel which extends radially part way into the slots the respectiv

1. A rotor assembly comprising: i) a plurality of rotor discs interconnected by an axially extending rim, the outside of the rim having a circumferential array of dovetail slots and the underside of the rim having a circumferential channel which extends radially part way into the slots the respective discs thus being interconnected axially across the channel by an array of circumferentially spaced connecting portions;ii) an array of blades, each blade having a blade root secured in a respective one of the dovetail slots; andiii) an annulus filler assembly, having: an annulus filler supported on the outside of rim, between adjacent blades, so as to form part of the inner wall of a respective flow annulus, the annulus filler additionally being anchored on the underside of the rim by an anchor element which is connected to the annulus filler through a clearance hole in a respective one of the connecting portions,wherein the annulus filler is supported on the outside of the rim by a radially-extending spacer element forming part of the annulus filler assembly, the relative circumferential width of the spacer element and the annulus filler being such that the spacer element allows for rolling movement of the annulus filler under a circumferential load,wherein the spacer element is a separate component from the annulus filler, the spacer element being fixed to the anchor element through the clearance hole in the connecting portion, and the annulus filler being fastened to the spacer element through one or more bores in the annulus filler,wherein the spacer element is a pillar seated end-on over the clearance hole, the base of the pillar being screwed to the anchor element through the clearance hole thereby to clamp the pillar onto the outside of the connecting portion, and the opposite end of the pillar being provided with either a threaded hole or bolt which engages respectively with a corresponding bolt or nut through a bore in the annulus filler thereby to secure the annulus filler to the pillar. 2. A rotor assembly according to claim 1 additionally provided with a blade-chocking assembly, comprising: a blade chocking member extending circumferentially along the channel underneath at least one of the blade roots and engaging the underside of the blade root thereby to chock the blade radially outwardly against the flanks of the respective dovetail slot, the chocking member being held in said chocking engagement with the underside of the blade root by a support element seated on the outside of the rim and connected to the chocking member through a clearance hole in a respective one of the connecting portions of the rim; wherein a part of the annulus filler assembly on the outside of the rim acts as said support element in the blade-chocking assembly, and a part of the blade chocking assembly on the underside of the rim acts as said anchor element in the annulus filler assembly. 3. A rotor assembly according to claim 2, wherein the parts are clamped respectively against the outside and underside of the rim by a tension-bearing connector element secured between the parts through the clearance hole in the connecting portion. 4. A rotor assembly according to claim 2, wherein the annulus filler or spacer element acts as the support element in the blade-chocking assembly, and the chocking member acts as the anchor element in the annulus filler assembly. 5. A rotor assembly according to claim 4, wherein the chocking member is in the form of a segmented ring extending around the circumferential channel, the chocking member being connected to a respective annulus filler or spacer element in each of a plurality of said annulus filler assemblies through a corresponding plurality of said clearance holes. 6. A rotor assembly according to claim 5, wherein the chocking member is connected to each annulus filler or spacer element by tension-bearing connector elements in the form of studs. 7. A rotor assembly according to claim 6, wherein the chocking member comprises a plurality of holes for alignment with the clearance holes in the connecting portions, the studs being formed separately from the chocking member for insertion through the aligned holes. 8. A rotor assembly according to claim 1, wherein the annulus filler is fastened directly or indirectly to the anchor element through one or more bores in the annulus filler. 9. A rotor assembly according to claim 8, wherein the annulus filler is fastened by a threaded bolt which engages a corresponding nut through said bore(s) in the annulus filler. 10. A rotor assembly according to claim 1, wherein the annulus filler is formed from a frangible material. 11. A rotor assembly for a gas turbine, comprising: i) a plurality of rotor discs interconnected by an axially extending rim, the outside of the rim having a circumferential array of dovetail slots and the underside of the rim having a circumferential channel which extends radially part way into the slots, the respective discs thus being interconnected axially across the channel by an array of circumferentially spaced connecting portions;ii) an array of blades, each blade having a blade root secured in a respective one of the dovetail slots;iii) an annulus filler assembly, having: an annulus filler supported on the outside of rim, between adjacent blades, so as to form part of the inner wall of a respective flow annulus, the annulus filler additionally being anchored on the underside of the rim by an anchor element which is connected to the annulus filler through a clearance hole in a respective one of the connecting portions; and(iv) a blade-chocking assembly, having: a blade chocking member extending circumferentially along the channel underneath at least one of the blade roots and engaging the underside of the blade root thereby to chock the blade radially outwardly against the flanks of the respective dovetail slot, the chocking member being held in said chocking engagement with the underside of the blade root by a support element seated on the outside of the rim and connected to the chocking member through a clearance hole in a respective one of the connecting portions of the rim. 12. A rotor assembly according to claim 11, wherein the chocking member projects radially into a circumferentially-extending groove on the underside of the blade root thereby axially to retain the blade root in the slot.