METHOD AND APPARATUS FOR USE IN CONTROLLING AND COMPENSATING CLEARANCE IN GAS TURBINE ENGINE

摘要

PROBLEM TO BE SOLVED: To specify the engine operating condition and a thermal condition determined by the condition without determining a steady state temperature by giving a signal showing a difference between the instant clearance under the thermal condition and the steady state clearance in the engine operating condition in response to a signal showing the engine operating condition. SOLUTION: A gas turbine engine 20 includes a fan area stored in an outer engine case 32 along a longitudinal axis 30, a compression area 24, a combustion area 26 and a turbine area 28. The gas turbine engine 20 has a passage 34 where working medium gas flows. The gas passage 34 is extended through the respective stream areas. The compression area 24 has a rotor assembly 40 provided in a case 44 and a stator assembly 42. A blade 54 is arranged in the circumferential direction round a rim 58 and fitted to the rim 58. The blade 54 and the case 44 are provided at a space to define a clearance.