Limited-channel compressor
AssigneeGarrett Transportation I Inc.
InventorsMalay C. Maniar, Shyamaprasad K
Life of this patent
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Abstract
A compressor wheel having a hub and a plurality of impellers that define flow channels. At a restriction point downstream from an inducer-end and upstream from a point at which the flow channel turns from an axial flow to a radial flow, the impellers are thick-walled, and at that point a sum of the flow-channel restriction-point tangential dimensions is not greater than 50% of the circumference at the restriction point. The thick-walled impellers are formed with hollow cavities between pressure-side and suction-side walls. From the restriction point to an exducer, the sum of the flow-channels' tangential dimensions increases at least proportionately to the square of the radius from the axis-of-rotation.
Claims20
A compressor wheel for compressing a fluid, comprising:
- a hub defining an axis-of-rotation, the hub forming a flow surface extending from an axial-inlet edge to a radial-outlet edge;
- and
- a plurality of impellers extending from the flow surface, the plurality of impellers being consecutively positioned around the axis-of-rotation, each impeller of the plurality of impellers having a leading edge, and a trailing edge;
- wherein the plurality of impellers defines a plurality of flow channels, each flow channel of the plurality of flow channels being defined by a pair of consecutively positioned impellers, each flow channel of the plurality of flow channels extending from an inducer-end at the respective leading edges, to an exducer-end at the respective trailing edges, and each flow channel of the plurality of flow channels having an axial-flow portion leading axially from the inducer-end to an inclination point, and a radial-flow portion leading radially from the inclination point to the exducer-end;
- wherein each flow channel of the plurality of flow channels defines a respective inducer zone extending axially from its respective inducer-end to a respective flow-channel restriction point downstream from the respective inducer-end and upstream from the respective inclination point;
- wherein a sum of the flow-channel restriction-point tangential dimensions for the plurality of flow channels is not functionally greater than 80% of the circumference at the flow-channel restriction points.
A compressor wheel for compressing a fluid, comprising:
- a hub defining an axis-of-rotation, the hub forming a flow surface extending from an axial-inlet edge to a radial-outlet edge;
- and
- a plurality of impellers extending from the flow surface, the plurality of impellers being consecutively positioned around the axis-of-rotation, each impeller of the plurality of impellers having a leading edge, and a trailing edge;
- wherein the plurality of impellers defines a plurality of flow channels, each flow channel of the plurality of flow channels being defined by a pair of consecutively positioned impellers from their respective leading edges to their respective trailing edges, each flow channel of the plurality of flow channels having an axial-flow portion leading axially from an inducer-end to an inclination point, and a radial-flow portion leading radially from the inclination point to an exducer-end;
- wherein the plurality of flow channels defines an inducer zone extending axially from the respective inducer-ends to respective flow-channel restriction points axially downstream from the respective leading edges and upstream from the respective inclination points;
- and
- wherein the plurality of impellers includes a plurality of multi-wall impellers, each multi-wall impeller forming a respective pressure-side wall and a respective suction-side wall, the pressure-side wall and the suction-side wall forming a cavity therebetween at the restriction point.
Dependencies are inferred from the claim text.