Patent ID: 9017031
Filing Date: 2015-04-28
Classification: F01D,F05D

Abstract:
1. An annulus filler for mounting to a rotor disc of a gas turbine engine and for bridging a gap between two adjacent blades attached to the rotor disc, the annulus filler comprising: a body portion including a lid and a support structure which supports an underside of the lid, the lid having a leading edge, a trailing edge, and opposing side edges which connect respective ends of the leading edge and the trailing edge, the lid defining an airflow surface for air being drawn through the engine, the support structure having side webs and a base plate having one or more attachment formations which, in use, connect the body portion to the rotor disc; wherein the lid comprises material properties that vary from the leading edge of the lid to the trailing edge of the lid, the material properties being configured to provide greater stiffness of the lid under compressive loading exerted on the opposing side edges by sideways blade movement at the leading edge than at the trailing edge, and the lid comprises material properties that vary between the opposing side edges of the lid toward the trailing edge to enable the side webs towards the trailing edge to move inwards towards one another to induce buckling of the trailing edge of the lid between the opposing side webs.