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US 8,075,247 B2Granted
Centrifugal impeller with internal heating
AssigneePratt & Whitney Canada Corp.
InventorsGiuseppe Romani, Xiaoliu Liu, Paul Stone, Bruce Fielding
Life of this patent
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Abstract
An internal heating arrangement for a centrifugal impeller for a gas turbine engine is provided having at least one heating passage extending through into the rotor for directing air bled from the rotor exit along the backface and forwardly through the impeller.
Claims12
An impeller assembly for a gas turbine engine, the impeller assembly comprising:
- an impeller rotor having a central bore, a back face, an impeller rotor exit and a radially outer face having a plurality of blades extending therefrom;
- a bleed apparatus for bleeding compressed air from the impeller rotor exit and delivering said bleed air to the bore along the impeller back face;
- and
- a heating passage extending through at least a portion of the impeller rotor bore, the heating passage having an inlet in fluid communication with bleed air provided to the impeller back face.
1 more element
A centrifugal impeller arrangement comprising:
- an impeller having a central bore;
- and
- means for heating a radially inner portion of the impeller with bleed air, wherein said means feeds the bleed air from a back face of the impeller forwardly through the impeller bore.
A method for reducing thermal stresses in a centrifugal impeller of a gas turbine engine, the method comprising the steps of:
- a) directing bleed air from the impeller along a back face of the impeller and to a bore of the impeller;
- and
- b) directing said bleed air forwardly through the bore to reduce a temperature gradient within the impeller.
Dependencies are inferred from the claim text.