Patent ID: 6155038
Filing Date: 2000-12-05
Classification: F01D,F02C

Abstract:
An apparatus for use with a gas turbine engine having a rotor assembly and a case, the rotor assembly having a rotor and a plurality of blades circumferentially spaced about and attached to the rotor, the blades being spaced apart from the case by a clearance, the gas turbine engine having an engine operating condition and a signal is provided indicative thereof, the apparatus comprising:first processing means, responsive to the signal indicative of the engine operating condition, for generating at least one signal representative of at least one thermal condition of the rotor assembly and at least one signal representative of at least one thermal condition of the case;second processing means responsive to the signal indicative of the engine operating condition, the at least one signal representative of the at least one thermal condition of the rotor assembly and the at least one signal representative of the at least one thermal condition of the case, for generating a signal indicative of a difference between an instantaneous clearance for the at least one thermal condition of the rotor assembly and the at least one thermal condition of the case and a clearance at steady state thermal conditions for the rotor assembly and the case for the engine operating condition.