Haufe, Daniel und Gürtler, Johannes und Schulz, Anita und Bake, Friedrich und Enghardt, Lars und Czarske, Jürgen (2018) Aeroacoustic analysis using natural Helmholtz–Hodge decomposition. Journal of Sensors and Sensor Systems, 7, Seiten 113-122. Copernicus Publications. doi: 10.5194/jsss-7-113-2018. ISSN 2194-8771.
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Offizielle URL: https://doi.org/10.5194/jsss-7-113-2018
Kurzfassung
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.
elib-URL des Eintrags: | https://elib.dlr.de/120866/ | ||||||||||||||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||
Titel: | Aeroacoustic analysis using natural Helmholtz–Hodge decomposition | ||||||||||||||||||||||||||||
Autoren: |
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Datum: | März 2018 | ||||||||||||||||||||||||||||
Erschienen in: | Journal of Sensors and Sensor Systems | ||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||
Open Access: | Ja | ||||||||||||||||||||||||||||
Gold Open Access: | Ja | ||||||||||||||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||
Band: | 7 | ||||||||||||||||||||||||||||
DOI: | 10.5194/jsss-7-113-2018 | ||||||||||||||||||||||||||||
Seitenbereich: | Seiten 113-122 | ||||||||||||||||||||||||||||
Verlag: | Copernicus Publications | ||||||||||||||||||||||||||||
ISSN: | 2194-8771 | ||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||
Stichwörter: | Separation acoustic and aerodynamic field | ||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||||||
HGF - Programmthema: | Antriebssysteme | ||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | L ER - Engine Research | ||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Turbinentechnologien (alt) | ||||||||||||||||||||||||||||
Standort: | Berlin-Charlottenburg | ||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Antriebstechnik > Triebwerksakustik | ||||||||||||||||||||||||||||
Hinterlegt von: | Bake, Dr.-Ing. Friedrich | ||||||||||||||||||||||||||||
Hinterlegt am: | 09 Jul 2018 10:32 | ||||||||||||||||||||||||||||
Letzte Änderung: | 14 Dez 2019 04:22 |
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