Piston-ring seal leakage tolerant hpc tie-shaft

A high-spool tie-shaft with a thermal barrier coating system proximate a gas turbine engine high pressure compressor bore cavity comprising:

• the high-spool tie-shaft including an inside diameter and an outside diameter opposite the inside diameter, an exterior surface proximate the outside diameter;
• a piston-ring seal in operative communication with the high-spool tie-shaft proximate the outside diameter, the piston-ring seal located between a front bore cavity portion and a rear bore cavity portion of the high pressure compressor bore cavity;
• and
• the thermal barrier coating system disposed on the exterior surface of the high-spool tie-shaft proximate the piston-ring seal.

A process for preventing high-spool tie-shaft distortion created by piston-seal ring leakage thermal energy within a gas turbine engine high pressure compressor bore cavity comprising:

• a high-spool tie-shaft including an inside diameter and an outside diameter opposite the inside diameter, an exterior surface proximate the outside diameter;
• a piston-ring seal in operative communication with the high-spool tie-shaft proximate the outside diameter, the piston-ring seal located between a front bore cavity portion and a rear bore cavity portion of the high pressure compressor bore cavity;
• disposing a thermal barrier coating system on the exterior surface of the high-spool tie-shaft proximate the piston-ring seal and
• preventing non-uniform thermal regions in the high-spool tie-shaft downstream of the piston-ring seal from leakage induced non-uniform localized hot streaks around the high-spool tie-shaft.