Active clearance control

Details Active clearance control Active clearance control

1986-12-24

1989-06-27

Tanner, Harry B.

Rotary kinetic fluid motors or pumps

With inspection, signaling, indicating or measuring means

415 14, 324 585R, F03B 1500, F01B 2516

Patent

active

048424773

ABSTRACT:
The invention relates to a type of proximity sensor. In one form, two sinusoidal signals travel along two transmission lines near an object. When the distance between one or both of the lines and the object changes, the speed of travel of one or both of the signals changes. There is a correlation between the speed change and the distance, thus allowing one to infer distance from speed change. One way to measure the speed change is to measure the phase relationship between the two signals. The invention can be used to measure clearances between turbine blades and turbine shrouds in gas turbine aircraft engines. Based on the measured clearance, other apparatus can direct hot or cold air upon the shroud to expand or shrink the shroud, thereby changing the clearance.

REFERENCES:
patent: 3757330 (1973-09-01), Hotston
patent: 4384819 (1983-05-01), Baker
patent: 4520308 (1985-05-01), Rohde et al.
patent: 4538124 (1985-08-01), Morrison

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