Closed-Loop Control of Vortex Shedding in a Separated Diffuser Using an Inverse Method
Abstract
We propose a closed-loop control algorithm for vortex shedding in a separated diffuser. We introduce pulses of zero-net-mass injection (consecutive blowing and suction) together with an inverse vortex imaging method. This method estimates the circulation of a vortex in the separated region based on pressure at a limited number of observer points at the wall. The closed-loop algorithm determines when to start the pulse so that the vortex is pinched off with a size which minimizes the stagnation pressure loss. We examine the proposed method in a simplified flow by performing direct numerical simulations of two-dimensional diffusers. In order to investigate the robustness of the closed-loop control algorithm, we impose high frequency acoustic disturbance upstream of the separation point. The disturbances significantly reduce the effectiveness of open-loop control compared to the case where no external disturbances are added. By using closed-loop control, however, performance is once again substantially recovered in the presence of disturbances.
Additional Information
© 2004 by Takao Suzuki, Tim Colonius, and Douglas G. MacMartin. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 21 Jun 2012. We would like to thank Prof. Hassan M. Nagib for many fruitful discussions on separation control.Attached Files
Submitted - SuzukiColoniusMacMartin2004.pdf
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Additional details
- Eprint ID
- 97270
- Resolver ID
- CaltechAUTHORS:20190718-165127197
- Created
-
2019-07-24Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field
- Other Numbering System Name
- AIAA Paper
- Other Numbering System Identifier
- 2004-577