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Embodiments of a turbomachine, having a longitudinal axis and a flowpath are provided. The turbomachine includes an impeller circumferentially disposed around the longitudinal axis, and an impeller shroud that surrounds a portion of the impeller. At least one opening formed through the impeller shro

Embodiments of a turbomachine, having a longitudinal axis and a flowpath are provided. The turbomachine includes an impeller circumferentially disposed around the longitudinal axis, and an impeller shroud that surrounds a portion of the impeller. At least one opening formed through the impeller shroud surface provides fluid communication between the flowpath and a dead-headed plenum.

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1. A turbomachine having a longitudinal axis and a flowpath, comprising: an impeller circumferentially disposed around the longitudinal axis;an impeller shroud comprising a surface having an inlet edge and an outlet edge, the impeller shroud coupled to and extending around a portion of the impeller;

1. A turbomachine having a longitudinal axis and a flowpath, comprising: an impeller circumferentially disposed around the longitudinal axis;an impeller shroud comprising a surface having an inlet edge and an outlet edge, the impeller shroud coupled to and extending around a portion of the impeller;a plurality of openings formed through the impeller shroud, wherein at least one of the openings comprises a centerline that is not perpendicular to the longitudinal axis; anda dead-headed plenum, wherein each of the plurality of openings provides fluid communication between the flowpath and the dead-headed plenum, and wherein there are no other openings in the dead-headed plenum. 2. The turbomachine of claim 1, wherein the first opening is circular with a diameter of from about 0.010 inches to about 0.300 inches. 3. The turbomachine of claim 1, wherein the impeller shroud surface defines a knee and the plurality of openings are disposed through the surface between the knee and the inlet edge of the impeller shroud. 4. The turbomachine of claim 3, wherein the plurality of openings are substantially circumferentially aligned between the inlet edge of the impeller shroud and the outlet edge of the impeller shroud. 5. The turbomachine of claim 3, wherein the distance between adjacent pairs of openings is substantially equal. 6. The turbomachine of claim 3, wherein the distance between adjacent pairs of openings is different. 7. The turbomachine of claim 1 wherein the impeller shroud has a thickness of about 0.075 inches thick to about 0.400 inches thick. 8. The turbomachine of claim 3, wherein one or more of the plurality of openings is slot-shaped, with a first dimension of about 0.1 inches and a second dimension of about 0.6 inches. 9. A turbomachine having a longitudinal axis and a flowpath, comprising: an impeller circumferentially disposed around the longitudinal axis;an impeller shroud comprising a surface having an inlet edge and an outlet edge, the impeller shroud coupled to and extending around a portion of the impeller, the impeller shroud surface defining a knee;a plurality of openings formed through the impeller shroud, disposed (i) through the surface between the knee and the inlet edge, or (ii) through the surface and between the inlet edge of the impeller shroud and the outlet edge of the impeller shroud;a dead-headed plenum, wherein the plurality of openings provides fluid communication between the flowpath and the dead-headed plenum, wherein at least one of the openings comprises a centerline that is not perpendicular to the longitudinal axis, and wherein there are no other openings in the dead-headed plenum. 10. The turbomachine of claim 9, wherein each of the plurality of openings are located at a predetermined first radial distance from the longitudinal axis. 11. The turbomachine of claim 9, wherein each of the plurality of openings are located at different radial distances from the longitudinal axis. 12. The turbomachine of claim 9, wherein, for the plurality of openings, the distance between adjacent pairs of openings is substantially equal. 13. The turbomachine of claim 9, wherein, for the plurality of openings, the distance between adjacent pairs of openings is different. 14. The turbomachine of claim 9, wherein each of the plurality of openings are circular with a diameter of from about 0.010 inches to about 0.400 inches. 15. The turbomachine of claim 9, wherein one or more of the plurality of openings is slot-shaped, with a first dimension of about 0.1 inches and a second dimension of about 0.6 inches.