Turbine passive thermal valve for improved tip clearance control

Details Turbine passive thermal valve for improved tip clearance control Turbine passive thermal valve for improved tip clearance control

1997-12-11

2000-09-12

Lopez, F. Daniel

Rotary kinetic fluid motors or pumps

With passage in blade, vane, shaft or rotary distributor...

415116, 415138, 4151733, 415176, F01D 902

Patent

active

061168521

ABSTRACT:
A gas turbine engine blade tip clearance control system and method is described. An annular housing is formed about an engine casing to which an annular shroud segment assembly is secured and closely spaced about blade tips of a stage of blades. The annular housing forms an air passage means communicating with the casing for directing a cooling air stream to the casing. A thermally operable passive ring valve is formed by two overlapped metal ring segments having a dissimilar coefficient of thermal expansion selected whereby to produce a radial gap between the ring segments when the valve temperature reaches a predetermined value. The radial gap admits a cooling air flow into the housing for cooling the casing and its associated shroud segment assembly to control radial growth and thereby prevent blade tip pinching.

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