Turbomachines having rogue vanes
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Mar 24, 1995
filing date -
Mar 24, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A turbomachine has a set of vanes in the airfoil cascade of its diffuser system. A first portion of the vanes are 'rogue' vanes. A second portion of the vanes are 'remaining' vanes. For a given flow through the vane set, the angle of incidence of the rogue vanes differs from the angle of incidence of the remaining normal vanes. The remaining vanes may be free-floating or positionable. The rogue vanes can be fixed or scheduled to dominate flow through the diffuser system, thereby improving efficiency of operation. Optionally, additional 'intermediate' vanes can be disposed between the 'rogue' vanes and the 'remaining' vanes. In a centrifugal pump or compressor, the 'rogue' vanes are positioned such that a preponderance of the flow will proceed through the impeller, subsequently through the rogue vanes, and then smoothly into the volute so that flow will pass smoothly through the system with minimum frictional effects and maximum pressure recovery. For centrifugal or axial turbomachines, the use of one or more sets of rogue vanes creates a 'channelizing' effect of the flow throughout the entire turbomachine.
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