Disc Cavity Thermocouple Upgrade

摘要

An arrangement to prevent thermocouple chafing with a guide tube within a rotor disc cavity during gas turbine operation is provided. The arrangement includes an interstage seal housing, a guide tube, and a thermocouple including a tip portion, an elongated portion, a head portion, and an antichafing strip. The guide tube is disposed in a radially extending bore of the interstage seal housing. The tip portion extends radially inward into the rotor disc cavity, the elongated portion is disposed at least partially within the guide tube, and the head portion is disposed radially outward of the casing. The tip portion includes a temperature sensing element which measures the temperature of the rotor disc cavity. The antichafing strip is disposed along the length of the elongated portion so that it is at least partially disposed within the guide tube. A method to prevent premature gas turbine shutdown due to thermocouople failure is also provided.

主权项

1. An arrangement to prevent thermocouple chafing with a guide tube within a rotor disc cavity during gas turbine engine operation, comprising:
an interstage seal housing; a guide tube; a thermocouple including a tip portion, an elongated portion, a head portion, and an antichafing strip, wherein the guide tube is disposed in a radially extending bore of the interstage seal housing, wherein the tip portion extends radially inward into the rotor disc cavity, the elongated portion is disposed at least partially within the guide tube, and the head portion is disposed radially outward of a turbine outer casing, wherein the tip portion includes a temperature sensing element which measures the temperature of the rotor disc cavity, wherein the antichafing strip is disposed in a position along the length of the elongated portion such that the antichafing strip is at least partially disposed within the guide tube.