Abstract
Simultaneous time-resolved measurements of the near-field hydrodynamic pressure field, 2-component streamwise velocity field, and far-field acoustics are taken for an un-heated, axisymmetric Mach 0.6 jet in co-flow. Synthetic jet actuators placed around the periphery of the nozzle lip provide localized perturbations to the shear layer. The goal of this study was to develop an understanding of how the acoustic nature of the jet responds to unsteady shear layer excitation, and subsequently how this can be used to reduce the far-field noise. Review of the cross-correlations between the most energetic low-order spatial Fourier modes of the pressure and the far-field region reveals that mode 0 has a strong correlation and mode 1 has a weak correlation with the far-field. These modes are emulated with the synthetic jet array and used as drivers of the developing shear layer. In open loop forcing configurations, there is energy transfer among spatial scales, enhanced mixing, a reconfiguration of the low-dimensional spatial structure, and an increase in the overall sound pressure level (OASPL). In the closed loop configuration, changes to these quantities are more subtle but there is a reduction in the overall fluctuating sound pressure level OASPLf by 1.35 dB. It is argued that this reduction is correlated with the closed loop control feeding back the dynamical low-order information measured in the largest noise producing region.
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Acknowledgments
The authors would like to acknowledge: AFOSR grant in conjunction with Clarkson University (FA9550-09-1-0051), John Schmisseur, program manager; Syracuse University STEM fellowship and the CNY-AGEP program; undergraduate Matthew Berry for his help with running the experiments; Christopher Ruscher, who helped with data analysis by means of an advanced custom processing code; and Spectral Energies, LLC. Phase 1 SBIR, with AFRL, Dr. Barry V. Kiel as project monitor.
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This article is part of the collection Topics in Flow Control. Guest Editors J. P. Bonnet and L. Cattafesta.
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Low, K.R., Berger, Z.P., Kostka, S. et al. A low-dimensional approach to closed-loop control of a Mach 0.6 jet. Exp Fluids 54, 1484 (2013). https://doi.org/10.1007/s00348-013-1484-8
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DOI: https://doi.org/10.1007/s00348-013-1484-8