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Embodiments of an apparatus for transferring energy between a rotating element and a fluid are provided herein. In some embodiments, a plenum of an apparatus for transferring energy between a rotating element and a fluid may include a through hole disposed through the plenum; and a plurality of inle

Embodiments of an apparatus for transferring energy between a rotating element and a fluid are provided herein. In some embodiments, a plenum of an apparatus for transferring energy between a rotating element and a fluid may include a through hole disposed through the plenum; and a plurality of inlet guide vanes disposed proximate a peripheral edge of the through hole, the plurality of inlet guide vanes comprising a first group of inlet guide vanes having a cambered profile and a second group of inlet guide vanes disposed radially inward of the first group of inlet guide vanes, wherein the first group of inlet guide vanes are in a fixed position with respect to the plenum and the second group of inlet guide vanes are movable with respect to the plenum.

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1. A plenum of an apparatus for transferring energy between a rotating element and a fluid, the plenum comprising: a through hole disposed through the plenum; anda plurality of inlet guide vanes disposed radially proximate a peripheral edge of the through hole, the plurality of inlet guide vanes com

1. A plenum of an apparatus for transferring energy between a rotating element and a fluid, the plenum comprising: a through hole disposed through the plenum; anda plurality of inlet guide vanes disposed radially proximate a peripheral edge of the through hole, the plurality of inlet guide vanes comprising: a first group of inlet guide vanes, each inlet guide vane of the first group of inlet guide vanes is in a fixed position with respect to the plenum, has a cambered profile, is independently sized and configured, and has a length defined between a leading edge and a trailing edge that is greater than a maximum width defined between a top surface and a bottom surface;a second group of inlet guide vanes disposed radially inward of the first group of inlet guide vanes, wherein each inlet guide vane of the second group of inlet guide vanes is movable with respect to the plenum and has a length defined between a leading edge and a trailing edge;a third group of inlet guide vanes, wherein each inlet guide vane of the third group of inlet guide vanes has a symmetrical profile and is disposed proximate one of a top or a bottom of the through hole; anda ring disposed at least partially within the through hole, wherein the plurality of inlet guide vanes are coupled to the ring and wherein the first group of inlet guide vanes extend radially outward beyond an outer edge of the ring,wherein each of the inlet guide vanes of the first group is spaced apart from a respective inlet guide vane of the second group, thereby forming a gap between each trailing edge of the inlet guide vanes of the first group and the leading edge of the respective inlet guide vane of the second group, and wherein the gap is defined at a mid-length of a combined overall length of each of the inlet guide vanes of the first group and the respective inlet guide vane of the second group. 2. The plenum of claim 1, wherein a size and a shape of the gap is determined by a size and a shape of each of the leading edge of a respective inlet guide vane of the second group and the trailing edge of the respective inlet guide vane of the first group. 3. The plenum of claim 1, wherein the third group of inlet guide vanes are rotatable about a rotation axis. 4. The plenum of claim 1, wherein the second group of inlet guide vanes have a symmetrical profile. 5. The plenum of claim 1, wherein at least one of the first, group, of inlet guide vanes comprises a length that is different from another of the first group of inlet guide vanes. 6. The plenum of claim 1, wherein the second group of inlet guide vanes are movably coupled to the first group of inlet guide vanes. 7. The plenum of claim 1, wherein the plurality of inlet guide vanes are disposed symmetrically about the peripheral edge of the through hole. 8. The plenum of claim 1, wherein the apparatus is a centrifugal compressor. 9. An apparatus for transferring energy between a rotating element and a fluid, comprising: a housing having an inlet to allow a flow of fluid into the housing;a plenum defining a flow path fluidly coupled to the inlet, the plenum having a through hole disposed through the plenum; anda plurality of inlet guide vanes disposed radially proximate a peripheral edge of the through hole, the plurality of inlet guide vanes comprising: a first group of inlet guide vanes, each inlet guide vane of the first group of inlet guide vanes is in a fixed position with respect to the plenum, has a cambered profile, is independently sized and configured, and has a length defined between a leading edge and a trailing edge that is greater than a maximum width defined between a top surface and a bottom surface;a second group of inlet guide vanes disposed radially inward of the first group of inlet guide vanes, wherein each inlet guide vane of the second group of inlet guide vanes is movable with respect to the plenum and has a length defined between a leading edge and a trailing edge;a third group of inlet guide vanes, wherein each inlet guide vane of the third group of inlet guide vanes has a symmetrical profile and is disposed proximate one of a top or a bottom of the through hole; anda ring disposed at least partially within the through hole, wherein the plurality of inlet guide vanes are coupled to the ring and wherein the first group of inlet guide vanes extend radially outward beyond an outer edge of the ring,wherein each of the inlet guide vanes of the first group is spaced apart from a respective inlet guide vane of the second group, thereby forming a gap between each trailing edge of the inlet guide vanes of the first group and the leading edge of the respective inlet guide vane of the second group, and wherein the gap is defined at a mid length of a combined overall length of each of the inlet guide vanes of the first group and the respective inlet guide vane of the second group. 10. The apparatus of claim 9, wherein a size and a shape of the gap is determined by a size and a shape of each of the leading edge of a respective inlet guide vane of the second group and the trailing edge of the respective inlet guide vane of the first group. 11. The apparatus of claim 9, wherein the third group of inlet guide vanes are rotatable about a rotation axis. 12. The apparatus of claim 9, wherein the second group of inlet guide vanes have a symmetrical profile. 13. The apparatus of claim 9, wherein at least one of the first group of inlet guide vanes comprises a length that is different from another of the first group of inlet guide vanes. 14. The apparatus of claim 9, wherein the second group of inlet guide vanes are movably coupled to the first group of inlet guide vanes. 15. The apparatus of claim 9, wherein the plurality of inlet guide vanes are disposed symmetrically about the peripheral edge of the through hole. 16. The apparatus of claim 9, wherein the apparatus is a centrifugal compressor.