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Reactive experimental control of turbulent jets

Published online by Cambridge University Press:  18 September 2024

Diego B.S. Audiffred Open the ORCID record for Diego B.S. Audiffred [Opens in a new window] ,
André V.G. Cavalieri Open the ORCID record for André V.G. Cavalieri [Opens in a new window] ,
Igor A. Maia Open the ORCID record for Igor A. Maia [Opens in a new window] ,
Eduardo Martini Open the ORCID record for Eduardo Martini [Opens in a new window]  and
Peter Jordan Open the ORCID record for Peter Jordan [Opens in a new window]
Diego B.S. Audiffred*
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos, 12228-900, Brazil
André V.G. Cavalieri
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos, 12228-900, Brazil
Igor A. Maia
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos, 12228-900, Brazil
Eduardo Martini
Affiliation:
Département Fluides, Thermique & Combustion, Institut Pprime, CNRS – Université de Poitiers – ISAE-ENSMA, 86360 Chasseneuil-du-Poitou, France
Peter Jordan
Affiliation:
Département Fluides, Thermique & Combustion, Institut Pprime, CNRS – Université de Poitiers – ISAE-ENSMA, 86360 Chasseneuil-du-Poitou, France
*
†Email address for correspondence: [email protected]
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Abstract

We present an experimental study of reactive control of turbulent jets, in which we target axisymmetric coherent structures, known to play a key role in the generation of sound. We first consider a forced jet, in which coherent structures are amplified above background levels, facilitating their detection, estimation and control. We then consider the more challenging case of an unforced jet. The linear control targets coherent structures in the region just downstream of the nozzle exit plane, where linear models are known to be appropriate for description of the lowest-order azimuthal modes of the turbulence. The control law is constructed in frequency space, based on empirically determined transfer functions. And the Wiener–Hopf formalism is used to enforce causality and to provide an optimal controller, as opposed to the sub-optimal control laws provided by simpler wave-cancellation methods. Significant improvements are demonstrated in the control of both forced and unforced jets. In the former case, order-of-magnitude reductions are achieved; and in the latter, turbulence levels are reduced by up to 60 %. The results open new perspectives for the control of turbulent flow at high Reynolds number.

JFM classification

Flow Control: Instability control Turbulent Flows: Turbulence control Wakes/Jets: Jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 994 , 10 September 2024 , A15
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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