Title

Reduction Of Vortex-Driven Oscillations In A Choked Duct Through Active Control

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.

Publication Date

12-1-2005

Publication Title

American Society of Mechanical Engineers, Dynamic Systems and Control Division (Publication) DSC

Volume

74 DSC

Issue

1 PART A

Number of Pages

805-813

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/IMECE2005-81378

Socpus ID

33645668699 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33645668699

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