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US 2012/0269635 A1Published application
Hub features for turbocharger wheel
AssigneeHoneywell International Inc.
InventorCheng Xu
Life of this patent
Estimating the term…
Abstract
A turbocharger including a wheel having suction surfaces and hub surfaces contoured to reduce secondary flow. The suction surfaces are radially contoured with a sinusoidal component, and further have a chamfered edge at the shroud edge. The hub end-walls are contoured both streamwise and cross-stream with sinusoidal components.
Claims34
A turbocharger wheel, comprising:
- a hub of a radial or mixed flow configuration, being characterized by an axis of rotation;
- and
- a plurality of blades, each blade having a hub edge adjoining the hub, a shroud edge opposite the hub edge, a leading edge, and a trailing edge;
- wherein the wheel is configured to rotate around the axis of rotation in a given direction with respect to its leading edge during turbocharger operation such that the leading edge is upstream of the trailing edge, and such that each blade is characterized by a pressurized surface and a suction surface;
- wherein between the hub edges of each successive pair of blades, the hub forms a hub end-wall extending between the pressurized surface of a first blade of the successive pair of blades and the suction surface of a second blade of the successive pair of blades;
- wherein the cross-sectional shape of each hub end-wall, when taken perpendicular to the flow direction at a streamwise location, is characterized by a cross-stream intermediate portion, a first portion that is closer to the first blade than the cross-stream intermediate portion, and a second portion that is closer to the second blade than the cross-stream intermediate portion;
- and
- wherein the cross-stream intermediate portion is characterized by a curvature that is both less concave than the first portion, and less concave than the second portion.
5 more elements
A turbocharger wheel, comprising:
- a hub of a radial or mixed flow configuration, being characterized by an axis of rotation;
- and
- a plurality of blades, each blade having a hub edge adjoining the hub, a shroud edge opposite the hub edge, a leading edge, and a trailing edge;
- wherein the wheel is configured to rotate around the axis of rotation in a given direction with respect to its leading edge during turbocharger operation such that the leading edge is upstream of the trailing edge, and such that each blade is characterized by a pressurized surface and a suction surface;
- wherein the blade leading edges in rotation around the axis of rotation define an inlet surface and the blade trailing edges in rotation around the axis of rotation define an outlet surface;
- wherein between the hub edges of each successive pair of blades, the hub forms a hub end-wall extending between the inlet surface and the outlet surface;
- wherein the cross-sectional shape of each hub end-wall, when taken parallel to the flow direction at a cross-stream location and represented meridionally, is characterized by a streamwise intermediate portion having a given curvature, a concave upstream portion that is closer to the inlet surface than the streamwise intermediate portion, and a concave downstream portion that is closer to the outlet surface than the streamwise intermediate portion;
- and
- wherein the streamwise intermediate portion is characterized by a curvature that is both less concave than the upstream portion, and less concave than the downstream portion.
6 more elements
A turbocharger wheel, comprising:
- a hub of a radial or mixed flow configuration, being characterized by an axis of rotation;
- and
- a plurality of blades, each blade having a hub edge opposite a shroud edge;
- wherein the height of each blade from the hub edge to the shroud edge, when taken perpendicular to the local flow direction, is characterized by a shape defined by a smoothly varying curve with no inflection points added to a cyclical component having at least two inflection points.
1 more element
Dependencies are inferred from the claim text.