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Reduction of Vortex-Driven Oscillations in a Choked Duct Through Active Control

[+] Author Affiliations
Jami W. Ward, Alexander Leonessa, Eric L. Petersen

University of Central Florida

Paper No. IMECE2005-81378, pp. 805-813; 9 pages
doi:10.1115/IMECE2005-81378
From:
  • ASME 2005 International Mechanical Engineering Congress and Exposition
  • Dynamic Systems and Control, Parts A and B
  • Orlando, Florida, USA, November 5 – 11, 2005
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 0-7918-4216-9 | eISBN: 0-7918-3769-6
  • Copyright © 2005 by ASME

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 duct’s 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.

Copyright © 2005 by ASME

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