Aeroacoustic analysis using natural Helmholtz–Hodge decomposition release_astqxyle6fhq3gxtnjf4pi3yz4

by Daniel Haufe, Johannes Gürtler, Anita Schulz, Friedrich Bake, Lars Enghardt, Jürgen Czarske

Published in Journal of Sensors and Sensor Systems by Copernicus GmbH.

2018   p113-122

Abstract

<strong>Abstract.</strong> The analysis of aeroacoustic phenomena is crucial for a deeper understanding of the damping mechanisms of a sound-absorbing bias flow liner (BFL). For this purpose, simultaneous measurements of the sound field and the flow field in a BFL are required. The fluid velocity can serve as the measurand, where both the acoustic particle velocity and the aerodynamic flow velocity contribute and, thus, can be acquired simultaneously. However, there is a need to separate these two quantities to distinguish between them. This is challenging because they generally coincide with each other in the time domain. Due to the interaction of sound and flow in a BFL, both velocities also overlap in the temporal frequency domain, having a coherent oscillation at the acoustic frequency. For this reason, the recently developed natural Helmholtz–Hodge decomposition (NHHD) is applied to separate both quantities from the measured oscillation velocity field in the spatial domain. The evaluation of synthetic vector field data shows that the quality of the decomposition is enhanced when a smaller grid size is chosen. The velocity field in a generic BFL, necessarily recorded within a three-dimensional region of interest at more than 4000 measurement locations, is evaluated using NHHD. As a result, the measured oscillation velocity in the BFL is dominated by the flow that is related to vortices and also by irrotational aerodynamic flow. Moreover, indications for an aeroacoustic source near the facing sheet of the liner are revealed.
In application/xml+jats format

Archived Files and Locations

application/pdf  4.8 MB
file_2xrfe756z5dnnfbkeibvsgq4sa
elib.dlr.de (repository)
web.archive.org (webarchive)
application/pdf  4.8 MB
file_oyt5y6rvt5b4dfnyhgmrtufvhy
web.archive.org (webarchive)
www.j-sens-sens-syst.net (web)
Read Archived PDF
Preserved and Accessible
Type  article-journal
Stage   published
Date   2018-03-01
Language   en ?
Journal Metadata
Open Access Publication
In DOAJ
In ISSN ROAD
In Keepers Registry
ISSN-L:  2194-8771
Work Entity
access all versions, variants, and formats of this works (eg, pre-prints)
Catalog Record
Revision: 5f582fe2-ccf5-465c-a1a4-365523d352f6
API URL: JSON