Non-axisymmetric impeller hub flowpath
AssigneeROLLS-ROYCE plc
InventorSteven Mazur
Life of this patent
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Abstract
A centrifugal impeller is disclosed having a non-axisymmetric flowpath surface. The centrifugal compressor may comprise a hub and a plurality of circumferentially spaced vanes. The hub has a flowpath surface and an axis of rotation. The plurality of circumferentially spaced vanes extend from the flowpath surface, with each of the vanes having a pressure-side fillet and a suction-side fillet extending from a leading edge to a trailing edge of the vane. The pressure-side fillet and suction-side fillet intersect the flowpath surface at a runout. The runout of the pressure-side fillet of a first vane is asymmetric to the runout of the suction-side fillet of the first vane.
Claims15
A centrifugal impeller comprising:
- a hub having a flowpath surface and an axis of rotation;
- and
- a plurality of circumferentially spaced vanes extending from said flowpath surface, each of the plurality of circumferentially spaced vanes having a pressure-side fillet and a suction-side fillet extending from a leading edge to a trailing edge of the vane, each of the pressure-side fillet and suction-side fillet intersecting the flowpath surface at a runout,
- wherein the runout of the pressure-side fillet of each vane is asymmetric to the runout of the suction-side fillet of each vane such that the runout of the pressure-side fillet is spaced further from the axis of rotation than an axisymmetric flowpath line and the runout of the suction-side fillet is spaced closer to the axis of rotation than the axisymmetric flowpath line, and
- wherein the plurality of circumferentially spaced vanes includes a first vane and an adjacent second vane spaced apart circumferentially from the first vane such that the flowpath surface extends between the first vane and the adjacent second vane at an angle relative to an axisymmetric flowpath line between a suction side of the first vane and a pressure side of the adjacent second vane.
A centrifugal impeller comprising:
- a hub having a flowpath surface and an axis of rotation;
- and
- a plurality of circumferentially spaced vanes extending away from the flowpath surface and extending along the flowpath surface from an inlet of the impeller to a discharge of the impeller along a axisymmetric flowpath line that is parabolic, each of the plurality of circumferentially spaced vanes having a pressure-side fillet and a suction-side fillet extending from a leading edge to a trailing edge of the vane,
- wherein a line at an intersection of the flowpath surface and the pressure-side fillet extending between the inlet of the impeller and the discharge of the impeller is non-parabolic and a line at an intersection of the flowpath surface and the suction-side fillet extending between the inlet of the impeller and the discharge of the impeller is non-parabolic, and
- wherein the line at the intersection of the flowpath surface and the pressure-side fillet is spaced further from the axis of rotation than the axisymmetric flowpath line and the line at the intersection of the flowpath surface and the suction-side fillet is spaced closer to the axis of rotation than the axisymmetric flowpath line.
Dependencies are inferred from the claim text.