Reduction of vortex-driven oscillations in a choked duct through active control Conference Paper uri icon

abstract

  • The effectiveness of active control schemes for the reduction of vortex-driven instabilities is demonstrated using an experimental setup consisting of a non-reacting primary flow of air, where both the duct exit and inlet are choked. Two plates produce the vortex-shedding phenomenon at the ducts first longitudinal mode. The potentially damaging low-frequency instabilities that arise when vortex-shedding frequencies couple with the natural acoustic modes of a choked duct are controlled using a secondary injection method, consisting of pulsing compressed air. A dynamic pressure transducer placed near the chamber exit allows to feed back the information needed to implement a closed-loop control scheme which effectively modifies the phasing of the secondary flow. The proposed approach was proven to be an effective means of reducing the problematic instabilities providing a 66% reduction in the FFT RMS amplitude when utilizing a Proportional-Derivative controller.

name of conference

  • Dynamic Systems and Control, Parts A and B

published proceedings

  • PROCEEDINGS OF THE ASME DYNAMIC SYSTEMS AND CONTROL DIVISION 2005, PTS A AND B

author list (cited authors)

  • Ward, J. W., Leonessa, A., & Petersen, E. L.

citation count

  • 0

complete list of authors

  • Ward, Jami W||Leonessa, Alexander||Petersen, Eric L

publication date

  • January 2005