Patent ID: 7025557

Claim:
A system for controlling secondary fluid flow within a flow channel, the flow channel having an inducer or impeller residing at least partially therein, the inducer or impeller having rotatable blades for drawing the flow into, or being driven by the flow in, the flow channel, the inducer or impeller rotatable about an axis, the flow channel defined by interior sidewalls of a housing, the housing at least partially surrounded by an inlet plenum, the housing including an exit, said system comprising: one or more diffuser slots having first and second ends, each of said first ends configured to be in fluid communication with the flow channel; one or more diffuser passages each including first and second ends, each of said first ends in fluid communication with one of said second ends of said one or more diffuser slots; a plurality of re-entry passages, each including first and second ends, each of said first ends in fluid communication with said second end of said one or more diffuser passages and each of said second ends configured to be in fluid communication with at least one of the inlet plenum, the housing exit, an area downstream of the housing exit, and the flow channel; and one or more bypass passages each having first and second ends, each of said first ends in fluid communication with said one or more diffuser slots and each of said second ends in fluid communication with at least one of the inlet plenum, the housing exit, an area downstream of the housing exit, and the flow channel.