A low-dimensional approach to closed-loop control of a Mach 0.6 jet Topics in Flow Control. Guest editors J.P. Bonnet and L. Cattafesta

Kerwin R. Low, Zachary P. Berger, Stanislav Kostka, Basman Elhadidi, Sivaram Gogineni, Mark N. Glauser

Research output: Contribution to journalReview article

22 Citations (Scopus)

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 OASPL f 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.

Original languageEnglish (US)
Article number1484
JournalExperiments in Fluids
Volume54
Issue number4
DOIs
StatePublished - Apr 1 2013

Fingerprint

Flow control
Mach number
far fields
shear layers
sound pressure
Acoustic waves
acoustics
configurations
pressure distribution
cross correlation
nozzles
Acoustic fields
near fields
Time measurement
velocity distribution
actuators
Energy transfer
energy transfer
hydrodynamics
time measurement

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

Cite this

Low, Kerwin R. ; Berger, Zachary P. ; Kostka, Stanislav ; Elhadidi, Basman ; Gogineni, Sivaram ; Glauser, Mark N. / A low-dimensional approach to closed-loop control of a Mach 0.6 jet Topics in Flow Control. Guest editors J.P. Bonnet and L. Cattafesta. In: Experiments in Fluids. 2013 ; Vol. 54, No. 4.
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A low-dimensional approach to closed-loop control of a Mach 0.6 jet Topics in Flow Control. Guest editors J.P. Bonnet and L. Cattafesta. / Low, Kerwin R.; Berger, Zachary P.; Kostka, Stanislav; Elhadidi, Basman; Gogineni, Sivaram; Glauser, Mark N.

In: Experiments in Fluids, Vol. 54, No. 4, 1484, 01.04.2013.

Research output: Contribution to journalReview article

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