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Jet-noise control by fluidic injection from a rotating plug: linear and nonlinear sound-source mechanisms

Published online by Cambridge University Press:  05 January 2016

Maxime Kœnig ,
Kenzo Sasaki ,
André V. G. Cavalieri ,
Peter Jordan  and
Yves Gervais
Maxime Kœnig*
Affiliation:
Acoustics Department, Safran Snecma, 77550 Moissy-Cramayel, France
Kenzo Sasaki
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos 12228900, Brazil
André V. G. Cavalieri
Affiliation:
Instituto Tecnológico de Aeronáutica, São José dos Campos 12228900, Brazil
Peter Jordan
Affiliation:
Departement Fluides, Thermique, Combustion, Institut Pprime, 86036 Poitiers, France
Yves Gervais
Affiliation:
Departement Fluides, Thermique, Combustion, Institut Pprime, 86036 Poitiers, France
*
†Email address for correspondence: maxime.koenig@snecma.fr
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Abstract

We present a study of the turbulent and acoustic fields of subsonic jets, controlled by means of a novel actuator that introduces perturbations via steady-fluidic actuation from a rotating centrebody. The actuation can produce louder or quieter jets, and these are analysed using time-resolved stereoscopic particle image velocimetry and a hot-wire anemometer. We place the analysis in the framework of wavepackets and linear stability theory, whence we show, using solutions of the linear parabolised stability equations, that the quieter flows can be understood to result from a mean-flow deformation that modifies wavepacket dynamics, and in particular their phase velocities, which are significantly reduced. The mean-flow deformation is shown, by a triple decomposition, to be due to the generation of Reynolds stresses associated with incoherent turbulence (rather than coherent structures) which arises when the actuation energises the flow with a frequency–azimuthal wavenumber (${\it\omega}$–$m$) combination to which the mean flow is stable. When the actuation excites the flow with an ${\it\omega}$–$m$ combination to which the mean flow is unstable, the response is dominated by coherent structures, whose rapid growth takes them beyond the linear limit, where they undergo quadratic wave interactions and lead, consequently, to a louder flow.

JFM classification

Acoustics: Aeroacoustics Acoustics: Jet noise Acoustics: Noise control
Type
Papers
Information
Journal of Fluid Mechanics , Volume 788 , 10 February 2016 , pp. 358 - 380
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Copyright
© 2016 Cambridge University Press 

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