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Experiments in Fluids

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01-04-2021 | Research Article

Surface temperature measurement of acoustic liners in the presence of grazing flow and thermal gradient

Authors: Victor Lafont, Fabien Méry, Philippe Reulet, Frank Simon

Published in: Experiments in Fluids | Issue 4/2021

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Abstract

The development of turbofans with larger fan diameters, shorter inlets, and thinner walls forces the acoustic liners to be placed closer to the hot parts of engines. This experimental study investigates the combined effects of large thermal gradients, grazing flow and acoustic level on the impedance of liners. Previous studies have shown that a coupling between these three effects can exist. The objective is thus to understand the underlying coupled phenomena, in order to extract the driving parameters for a more accurate impedance modeling. In the ONERA B2A grazing flow acoustic liner facility, the flow temperature can be accurately regulated and several types of acoustic excitation can be provided. For the purposes of this study, a test section with a heating device is used to obtain a thermal gradient between the backplate and the perforated plate of the liner sample. Infrared (IR) thermography is used to measure the temperature distribution on the perforated plate. The measurement is conducted for several configurations, to determine in which conditions the coupling between thermal and acoustic dissipation effects exists. In particular, a possible control of surface temperature by high sound pressure level is highlighted.

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Title: Surface temperature measurement of acoustic liners in the presence of grazing flow and thermal gradient
Authors: Victor Lafont
Fabien Méry
Philippe Reulet
Frank Simon
Publication date: 01-04-2021
Publisher: Springer Berlin Heidelberg
Published in: Experiments in Fluids / Issue 4/2021
Print ISSN: 0723-4864
Electronic ISSN: 1432-1114
DOI: https://doi.org/10.1007/s00348-021-03184-w

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