Open-loop control of fully nonlinear self-excited oscillations

M. P. Hallberg; P. J. Strykowski

doi:10.1063/1.2908008

Open-loop control of fully nonlinear self-excited oscillations

M. P. Hallberg, P. J. Strykowski

Administration (CSENG)

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20 Scopus citations

Abstract

Experiments conducted using a low-density axisymmetric jet reveal that the self-excited nature can be altered by modulating the external pressure field using an acoustic driver. A region exists in the forcing frequency-amplitude space where the self-sustaining frequency is entirely absent and solely replaced by the forcing frequency and harmonics thereof. Inside this region, the centerline streamwise velocity disturbance level can be significantly increased or decreased. Visual evidence suggests these alterations coincide with dramatic changes in jet spreading and demonstrates that forcing can provide an effective means of controlling mixing in self-excited jets. Results support theoretical predictions made by Pier [B. Pier, Proc. R. Soc. London, Ser. A 459, 1105 (2003)].

Original language	English (US)
Article number	041703
Journal	Physics of Fluids
Volume	20
Issue number	4
DOIs	https://doi.org/10.1063/1.2908008
State	Published - Apr 2008
Event	Symposium of the International Union of Theoretical and Applied Mechanics on Recent Advances in Multiphase Flows: Numerical and Experimental, IUTAM - Istanbul, Turkey Duration: Jun 11 2007 → Jun 14 2007

Bibliographical note

Funding Information:
The authors would like to acknowledge support from the National Science Foundation under Grant No. CTS-0317429 as well as University of Minnesota support provided through a doctoral dissertation fellowship.

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AB - Experiments conducted using a low-density axisymmetric jet reveal that the self-excited nature can be altered by modulating the external pressure field using an acoustic driver. A region exists in the forcing frequency-amplitude space where the self-sustaining frequency is entirely absent and solely replaced by the forcing frequency and harmonics thereof. Inside this region, the centerline streamwise velocity disturbance level can be significantly increased or decreased. Visual evidence suggests these alterations coincide with dramatic changes in jet spreading and demonstrates that forcing can provide an effective means of controlling mixing in self-excited jets. Results support theoretical predictions made by Pier [B. Pier, Proc. R. Soc. London, Ser. A 459, 1105 (2003)].

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Open-loop control of fully nonlinear self-excited oscillations

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