Variable bleed slot in centrifugal impeller
AssigneeUnited Technologies Corporation
InventorBenjamin E. Fishler
Life of this patent
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Abstract
The present disclosure relates to shroud bleed in centrifugal compressors. An air-limiting component 130 may be located adjacent to a shroud 120. The shroud 120 may have a primary bleed slot 210, and the air-limiting component 130 may have a secondary bleed slot 310. The primary bleed slot 210 and the secondary bleed slot 310 may overlap at an effective bleed slot location. The air-limiting component 130 may rotate relative to the shroud 120, which may change a streamwise location of the effective bleed slot.
Claims9
A centrifugal compressor comprising:
- a shroud located adjacent to an impeller, the shroud comprising a plurality of primary bleed slots;
- an air-limiting component located adjacent to the shroud, the air-limiting component comprising a plurality of secondary bleed slots overlapping the plurality of primary bleed slots, wherein the plurality of secondary bleed slots are offset by an angle from the plurality of primary bleed slots;
- a plurality of bearings located between the shroud and the air-limiting component;
- and
- an actuator configured to rotate the air-limiting component, wherein, in response to the actuator rotating the air-limiting component, an overlapping position of the plurality of primary bleed slots and the plurality of secondary bleed slots varies.
A method comprising:
- determining a shroud bleed location in a centrifugal compressor, wherein the determining comprises iteratively measuring an efficiency of the centrifugal compressor;
- and
- rotating an air-limiting component relative to a shroud, such that a bleed slot in the air-limiting component overlaps a bleed slot in the shroud at the shroud bleed location.
A centrifugal compressor comprising:
- a shroud located adjacent to an impeller, the shroud comprising a plurality of primary bleed slots;
- an air-limiting component located adjacent to the shroud, the air-limiting component comprising a plurality of secondary bleed slots overlapping the plurality of primary bleed slots, wherein at least one of the plurality of primary bleed slots and the plurality of secondary bleed slots vary in width;
- a plurality of bearings located between the shroud and the air-limiting component;
- and
- an actuator configured to rotate the air-limiting component, wherein, in response to the actuator rotating the air-limiting component, an overlapping position of the plurality of primary bleed slots and the plurality of secondary bleed slots varies.
A method comprising:
- determining a shroud bleed location in a centrifugal compressor;
- and
- rotating an air-limiting component relative to a shroud, such that a bleed slot in the air-limiting component overlaps a bleed slot in the shroud at the shroud bleed location, wherein the rotating changes a streamwise location of where the bleed slots overlap.
Dependencies are inferred from the claim text.