Gas turbine casing thermal control device

A gas turbine casing assembly comprising:

• an inner casing arranged around a central axis, the inner casing defining an opening therethrough in communication with an interior of the gas turbine;
• an outer casing arranged around the inner casing;
• and
• at least one plate attached to an outer surface of the inner casing, the plate having a first surface opposing the inner casing and having a second surface opposite the first surface, the plate defining a plurality of holes through the plate from the first surface to the second surface, the holes 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 temperature of the inner casing across the area, the plate and inner casing defining a thermal control gas flow path from radially outside of the plate through the holes in the plate and then through the inner casing into the interior of the gas turbine.

A gas turbine comprising:

• a compressor section;
• a combustion section downstream from the compressor section;
• and
• a turbine section downstream from the combustion section, wherein the turbine section includes:
• an inner casing arranged around a central axis, the inner casing defining an opening therethrough in communication with an interior of the turbine section;
• an outer casing arranged around the inner casing;
• and
• at least one plate attached to an outer surface of the inner casing, the plate having a first surface opposing the inner casing and having a second surface opposite the first surface, the plate defining a plurality of holes through the plate from the first surface to the second surface, the holes 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 temperature of the inner casing across the area, the plate and inner casing defining a thermal control gas flow path from radially outside of the plate through the holes in the plate and then through the inner casing into the interior of the turbine section.