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Adjoint-based acoustic wave sensitivity of a double-stream jet

Airiau, Christophe and Ansaldi, Tobias and Puigt, Guillaume and Pérez Arroyo, Carlos Adjoint-based acoustic wave sensitivity of a double-stream jet. (2016) In: Euromech Colloquium 571 : Jet noise modelling and control, 28 September 2016 - 30 September 2016 (Palaiseau, France). (Unpublished)

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Abstract

Understand the underlying physics in a perturbed or controled environment of a jet flow is one of the key to reduce noise emission in an aircraft turbofan engine. A sensitivity analysis of the pressure instability wave has been performed in a single and double-stream supersonic jet flow. The mean flow is obtained from accurate LES simulation performed at CERFACS (Toulouse) and contains some shock cells and two shear layers which are producing large noise emission. As it has been previously demonstrated, the noise source originates from some instabilities which are amplified through inviscid and viscous mechanisms. The instability are studied in this work using the linear nonlocal stability equations (PSE) under an inviscid formulation. To investigate sensitivity, their adjoint counterpart called ’APSE’ have been developed following the previous Airiau’s works on the laminar boundary layer control(2003). Sensitivities of the energy or acoustic energy of the perturbation are solved with any local forcing (mass, momentum, energy). The maximun of sensitivities are found in a very narrow band of the flow, close to the shear layers, and are related to two Kelvin-Helmholtz modes. Sensitivities of the acoustic wave will be emphasized and regions of high sensitivities will be analyzed through several criteria, as for instance, the location of the critical layer, the inflexion point line, the potential cone limit and others. Conclusions will be drawn to give some possible paths toward noise control of a double-stream jet.

Item Type:Conference or Workshop Item (Other)
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:Other partners > Airbus (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > EDF (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Other partners > Total (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Météo France (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
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Deposited By: Christophe AIRIAU
Deposited On:28 Sep 2017 09:54

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