CUED Publications database

A theoretical approach to the passive control of spiral vortex breakdown

Qadri, UA and Juniper, MP (2012) A theoretical approach to the passive control of spiral vortex breakdown. Proceedings of the 2012 UKACC International Conference on Control, CONTROL 2012. pp. 656-661.

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Previous numerical simulations have shown that vortex breakdown starts with the formation of a steady axisymmetric bubble and that an unsteady spiralling mode then develops on top of this.We study how this spiral mode of vortex breakdown might be suppressed or promoted. We use a Lagrangian approach to identify regions of the flow which are sensitive to small open-loop steady and unsteady (harmonic) forces. We find these regions to be upstream of the vortex breakdown bubble. We investigate passive control using a small axisymmetric control ring. In this case, the steady and unsteady control forces are caused by the drag force on the control ring. We find a narrow region upstream of the bubble where the control ring will stabilise the flow and we verify this using numerical simulations. © 2012 IEEE.

Item Type: Article
Uncontrolled Keywords: adjoint flow control passive control sensitivity analysis vortex breakdown
Divisions: Div A > Energy
Depositing User: Cron job
Date Deposited: 16 Jul 2015 14:09
Last Modified: 26 Nov 2015 12:02
DOI: 10.1109/CONTROL.2012.6334707