Cooling airflow modulation

Details Cooling airflow modulation Cooling airflow modulation

2009-01-02

2011-12-06

Zarneke, David (Department: 2891)

Fluid reaction surfaces (i.e., impellers)

Method of operation

C416S095000, C416S09600A, C416S09600A, C416S09700R, C416S09700R, C415S115000

Reexamination Certificate

active

08070436

ABSTRACT:
A gas turbine engine airfoil (22) has a wall (42) provided with a cooling effusion hole (40) therein to facilitate film cooling of the external surface (52) of the wall (42). A member (46) attached to the internal surface (48) of the airfoil wall (42) is provided with an aperture (44) which at least partially overlaps the cooling effusion hole (40). The airfoil wall (42) and member (46) are formed from materials having different coefficients of thermal expansion and are mounted such that over a temperature range, the aperture (44) and cooling effusion hole (40) interact to a greater or lesser extent to modulate the flow of cooling air therethrough.

REFERENCES:
patent: 4805398 (1989-02-01), Jourdain et al.
patent: 1 491 112 (1977-11-01), None
patent: 2 236 147 (1991-03-01), None
patent: 2 390 663 (2004-01-01), None
patent: A-02-021173 (1990-01-01), None
patent: WO 99/30010 (1999-06-01), None

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