Patent ID: 7828513

Claim:
An air seal arrangement for a disc wheel in a gas turbine engine, the disc wheel comprising a sleeve portion having an outer surface, the arrangement comprising a static knife edge seal in registry with the outer surface without contacting the outer surface, the static knife edge seal having a free end adjacent to the outer surface, the free end of the static knife edge seal and the outer surface of the sleeve portion of the disc wheel being spaced apart to regulate an air flow by allowing air to flow in a gap between the free end and the outer surface of the sleeve portion, the sleeve portion of the disc wheel comprising a recess defining a first chamber with a shaft on which the disc wheel is secured in rotational engagement, the sleeve portion having at least one passage between the first chamber and a second chamber defined between the outer surface of the sleeve portion and an interior side of the static knife edge seal, the first chamber and the second chamber separated by the sleeve portion.