Patent ID: 9422824
Filing Date: 2016-08-23
CPC Classification: F01D,F02C

Claim Text:
1. A thermal control method for a gas turbine casing of a gas turbine including an inner casing arranged around a central axis, the inner casing defining an opening therethrough in communication with an interior of the gas turbine, and an outer casing arranged around the inner casing, the method including: supplying thermal control gas from a compressor to a space defined between the outer casing and the inner casing; and transferring the thermal control gas from the space into a cavity and from the cavity through the opening in the inner casing, wherein the cavity is defined between a plate and an outer surface of the inner casing, the plate being attached to an area of the inner casing and having a first surface opposing the outer surface of the inner casing and a second surface opposite the first surface, wherein the plate further comprises a flange that extends radially inwardly from the first surface towards the inner casing and entirely about a perimeter of the plate, wherein a plurality of holes are defined through the plate from the first surface to the second surface, wherein the plurality of holes is arranged with a predetermined non-uniform distribution in the plate corresponding to a desired preferential impingement pattern for providing non-uniform heat transfer from the area during operation of the gas turbine so as to control a temperature of the inner casing across the area, wherein the flange is disposed within a slot defined within the outer surface of the inner casing forming a seal between the outer surface of the inner casing and the flange.