Turbomachine

Details Turbomachine Turbomachine

1997-01-27

1998-06-30

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

057724008

ABSTRACT:
A gas turbine engine turbomachine (10) comprises a turbine section (18) in which cooling air is supplied from a compressor section (14) via a pipe (68) to a chamber (60). The chamber (60) supplies the cooling air through passages (58) in the nozzle guide vanes (30) to impinge upon a stator disc (32). A valve (70) in the pipe (68) is used to switch the flow of cooling air on and off. The valve (70) is opened to allow the cooling air to cool the stator disc (32) to shrink the stator disc (32) to minimise clearance between a shroud (34) supported by the nozzle guide vanes (30) and the turbine blades (28) during one mode of operation. The valve (70)is closed to allow the stator disc (32) to expand to increase the clearance between the shroud (34) and the turbine blades (28).

REFERENCES:
patent: 3535873 (1970-10-01), Szydlowski
patent: 3975901 (1976-08-01), Hallinger et al.
patent: 4117669 (1978-10-01), Heller
patent: 5044881 (1991-09-01), Dodd et al.
patent: 5169287 (1992-12-01), Proctor et al.
patent: 5525032 (1996-06-01), Kreis et al.

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