Visualization of Flows in Curved Channels with a Moderate or High Rotation Speed
Flows in channels with streamwise curvature and spanwise rotation are visualized in terms of end-view near the exit of the test sections through injecting smoke into the flows. Two test sections are used, i.e. the rectangular channels with the aspect ratio of and 10, respectively. The work focuses o...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
1997-01-01
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| Series: | International Journal of Rotating Machinery |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1155/S1023621X97000201 |
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| Summary: | Flows in channels with streamwise curvature and spanwise rotation are visualized in terms
of end-view near the exit of the test sections through injecting smoke into the flows. Two test
sections are used, i.e. the rectangular channels with the aspect ratio of and 10, respectively.
The work focuses on visualization of Dean and Coriolis vortices under the effects of secondary
instabilities and flows in the region with a relatively high rotation speed. The results
show that the secondary instabilities cause the Dean and Coriolis vortices oscillating in
various forms and the flows at high rotation speeds are controlled by the secondary instabilities
rather than the primary instability. In particular, the secondary instabilities lead the
flows to be unsteady and turbulent somewhat like the bursting flow in the turbulent boundary
layers. |
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| ISSN: | 1023-621X |