Clearance control arrangement

A clearance control arrangement for a rotor, the arrangement comprising:

• a rotor;
• a casing radially outside the rotor;
• a segment assembly spaced radially inwards from the casing and defining a radial clearance between the rotor and the segment assembly;
• a front carrier and a rear carrier, the segment assembly supported by the carriers;
• a heat transfer cavity formed between the carriers, the segment assembly and the casing;
• a segment cooling cavity adjacent to the rotor, wherein the heat transfer cavity and the segment cooling cavity are radially separated by a plate;
• and
• a settling chamber formed adjacent to the casing and upstream of the heat transfer cavity, wherein the clearance control arrangement is configured to receive air into the settling chamber and thence to deliver the air to the heat transfer cavity;
• wherein
• the settling chamber has an axial length (lsc) to reduce turbulence in the air passing through the settling chamber to below a threshold level,
• the segment assembly further includes a front hook and a rear hook, the front hook being configured to support the front carrier and the rear hook being configured to support the rear carrier,
• the front hook has gaps through which the air is axially delivered from the settling chamber to the heat transfer cavity, and
• the plate is disposed entirely radially inward of the front hook.