Tip clearance control

Details Tip clearance control Tip clearance control

1997-04-28

1999-02-16

Kwon, John T.

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Between blade edge and static part

4151732, F04D 2918

Patent

active

058713336

ABSTRACT:
A tip clearance control system operated by differential air pressure has a movable shroud liner segment assembly which forms the inner circumference of an annular pressure chamber encircling the blades of a rotary stage. High pressure air is bled into the chamber from a source of HP compressor delivery air through small holes. The chamber may be vented rapidly through an electrically controlled valve into the engine bypass duct. When the valve is opened pressure in the chamber is dropped quickly below gas path pressure to move the shroud liner segments radially outwards thereby increasing blade tip clearance.

REFERENCES:
patent: 3452542 (1969-07-01), Saferstein et al.
patent: 3936217 (1976-02-01), Travaglini et al.
patent: 3975901 (1976-08-01), Hallinger et al.
patent: 4214851 (1980-07-01), Tuley et al.
patent: 4330234 (1982-05-01), Colley
patent: 4334822 (1982-06-01), Rossmann
patent: 5601402 (1997-02-01), Wakeman et al.
patent: 5685693 (1997-11-01), Sexton et al.

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