Structures and methods for forcing coupling of flow fields of adjacent bladed elements of turbomachines, and turbomachines incorporating the same

摘要

Turbomachines having close-coupling flow guides (CCFGs) that are designed and configured to closely-couple flow fields of adjacent bladed elements. In some embodiments, the CCFGs may be located in regions extending between the adjacent bladed elements, described herein as coupling avoidance zones, where conventional turbomachine design would suggest no structure should be added. In yet other embodiments, CCFGs are located upstream and/or downstream of rows of blades coupled to the bladed elements, including overlapping one of more of the rows of blades, to improve flow coupling and machine performance. Methods of designing turbomachines to incorporate CCFGs are also provided.

主权项

1. A turbomachine, comprising:
an impeller rotatably disposed adjacent a shroud having a shroud surface, said impeller having a plurality of impeller blades, each of said impeller blades having:
a shroud edge adjacent said shroud surface; anda trailing edge; and a diffuser located downstream of said impeller, said diffuser forming at least one diffuser passageway; wherein said shroud surface includes a plurality of elongate recesses located in said shroud surface and extending downstream along said shroud surface and into said diffuser, said recesses configured to guide a portion of a working fluid in said turbomachine.