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JET NOISE REDUCTION USING PULSED FLUIDIC ACTUATION

Remy Maury
Institut Pprime-Branche fluide Université de Poitiers 43 route de l'aérodrome,86000 Poitiers, France

Andre V. G. Cavalieri
Institut Pprime CNRS - Universite de Poitiers - ENSMA 43, Route de I'Aerodrome 86036 POITIERS CEDEX, France; Laboratorio de Engenharia Aeronautica Instituto Tecnologico de Aeronautica Sao Jose dos Campos, SP, BRAZIL

Peter Jordan
Department of Fluid, Thermal and Combustion Sciences Pprime Institute, CNRS-Universite de Poitiers, ISAE-ENSMA 43 rue de I'Aerodrome, F-86036 Poitiers CEDEX, France

Joel Delville
Department of Fluid Flow, Heat Transfer and Combustion Institute Pprime - UPR 3346 - CNRS - Universite de Poitiers - ENSMA CEAT - F86036 Poitiers cedex, France

Jean-Paul Bonnet
Institut Pprime-Branche fluide Université de Poitiers 43 route de l'aérodrome,86000 Poitiers, France

Аннотация

Steady and unsteady fluidic actuators, in the form of secondary control jets injecting from the nozzle lip, aimed at jet noise reduction, are investigated. Three different geometric configurations are tested: non-converging control jets, 'open' triangle convergence and 'closed' triangle convergence. By means of a triple decomposition of hot-wire data and a scale-separation argument, the low-frequency perturbation (near-nozzle dynamics) and response (global, downstream dynamics) of the flow are studied. Comparison of the phase-averaged component of the decomposition with predictions of linear stability theory (LST) suggest that two qualitatively different responses are active: at the main forcing frequency the jet response looks to be non-linear; at two secondary, higher frequencies, LST gives reasonable predictions for the local growth rates and convection velocities.