抄録
A new damage-diagnosis system for gas turbines has been developed. One of the features of the system is a method of evaluating damage to the hot-gas-path components of gas turbines. The relationship between sensor signals installed in the gas turbine and the thermal boundary conditions of the hot-gas-path components was established. The local stress, strain and temperature of the components under operational conditions was calculated using finite element analyses within the framework of the experimental design. Damage induced by creep/thermal fatigue of the hot-gas-path components was accurately evaluated in real-time using sensor signals, and taking the variations that occur in real operating conditions into account. The use of our system to evaluate damage to a first-stage blade is described. The results of damage-diagnosis of the blade calculated using the system are compared with field data collected during in-service inspections.
