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Closed-Loop Control of Vortex Shedding in a Separated Diffuser Using an Inverse Method

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.

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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)
Related URLs:
URLURL TypeDescription Paper Paper
Colonius, Tim0000-0003-0326-3909
MacMartin, Douglas G.0000-0003-1987-9417
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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Other Numbering System NameOther Numbering System ID
AIAA Paper2004-577
Record Number:CaltechAUTHORS:20190718-165127197
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97270
Deposited By: Melissa Ray
Deposited On:24 Jul 2019 23:12
Last Modified:16 Nov 2021 17:30

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