Boots – shoes – and leggings
Patent
1988-03-31
1991-04-30
Gruber, Felix D.
Boots, shoes, and leggings
60 3975, 415 1, 415118, 415175, F02C 712, F02C 718, F01D 2508
Patent
active
050124200
ABSTRACT:
The invention concerns an active clearance control for controlling clearance between a turbine and a casing in a gas turbine aircraft engine.
The invention calculates the instantaneous clearance between a turbine casing and a turbine rotor, based on temperature. Two temperatures are involved. First, a steady state temperature (SSTemp) is computed for the rotor and the casing. SSTemp is a predicted, future temperature, which will be attained when the engine reaches steady state operation. Each SSTemp is computed based on presently occurring engine operating conditions, such as selected temperatures, pressures, and rotational speeds.
Changes which occur in the SSTemp's indicate the second temperatures, which are the instantaneous temperatures of the casing and rotor. These changes in SSTemp are caused by changes in the present operating conditions, which occur during engine acceleration and deceleration. The instantaneous temperatures indicate the diameters of the casing and the rotor, and thus the instantaneous clearance between them.
In another form of the invention, the computed instantaneous clearance is used to control air which is bled from the fan and ducted onto the casing, in order to attain a desired clearance.
REFERENCES:
patent: 4023919 (1977-05-01), Patterson
patent: 4332133 (1982-06-01), Schwarz et al.
patent: 4338061 (1982-07-01), Beitler et al.
patent: 4621335 (1986-11-01), Bluish et al.
patent: 4709546 (1987-12-01), Weiler
patent: 4804310 (1989-02-01), Fuller et al.
patent: 4805398 (1989-02-01), Jourdain et al.
patent: 4815928 (1989-03-01), Pineo et al.
patent: 4849895 (1989-07-01), Kervistin
Joyce David L.
Kastrup David A.
Reese Scott P.
Walker Roger C.
General Electric Company
Gruber Felix D.
Squillaro Jerome C.
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