Suzuki, Takao and Colonius, Tim and MacMartin, Douglas G. (2004) Closed-Loop Control of Vortex Shedding in a Separated Diffuser Using an Inverse Method. In: 42nd AIAA Aerospace Sciences Meeting and Exhibit, 5-8 January 2004, Reno, NV. https://resolver.caltech.edu/CaltechAUTHORS:20190718-165127197
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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.
| Item Type: | Conference or Workshop Item (Paper) | |||||||||
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| 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. | |||||||||
| Subject Keywords: | Aerospace Systems, Operations and Life Cycle | |||||||||
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| DOI: | 10.2514/6.2004-577 | |||||||||
| Record Number: | CaltechAUTHORS:20190718-165127197 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20190718-165127197 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 97270 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Melissa Ray | |||||||||
| Deposited On: | 24 Jul 2019 23:12 | |||||||||
| Last Modified: | 16 Nov 2021 17:30 |
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