Analysis of Secondary Flows in Centrifugal Impellers
Secondary flows are undesirable in centrifugal compressors as they are a direct cause for flow (head) losses, create nonuniform meridional flow profiles, potentially induce flow separation/stall, and contribute to impeller flow slip; that is, secondary flows negatively affect the compressor performa...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2005-01-01
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| Series: | International Journal of Rotating Machinery |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/IJRM.2005.45 |
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| Summary: | Secondary flows are undesirable in centrifugal
compressors as they are a direct cause for flow (head) losses,
create nonuniform meridional flow profiles, potentially induce
flow separation/stall, and contribute to impeller flow slip; that
is, secondary flows negatively affect the compressor performance.
A model based on the vorticity equation for a rotating system was
developed to determine the streamwise vorticity from the normal
and binormal vorticity components (which are known from the
meridional flow profile). Using the streamwise vorticity results
and the small shear-large disturbance flow method, the onset,
direction, and magnitude of circulatory secondary flows in a
shrouded centrifugal impeller can be predicted. This model is also
used to estimate head losses due to secondary flows in a
centrifugal flow impeller. The described method can be employed
early in the design process to develop impeller flow shapes that
intrinsically reduce secondary flows rather than using disruptive
elements such as splitter vanes to accomplish this task. |
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| ISSN: | 1023-621X 1542-3034 |