Hirschberg, Lionel und Hulshoff, Steven J. und Bake, Friedrich (2020) Sound Production due to Swirl-Nozzle Interaction: Model-Based Analysis of Experiments. In: AIAA Aviation 2020 Forum. 26th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2020 FORUM, 2020-06-15 - 2020-06-19, Virtual Event. doi: 10.2514/6.2020-2532. ISBN 978-162410598-2.
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Offizielle URL: https://doi.org/10.2514/6.2020-2532
Kurzfassung
Indirect noise due to the interaction of flow inhomogeneities with a choked nozzle is as an important cause of combustion instability in solid rocket motors and is believed to be important in aircraft engines. A previously published experiment demonstrated that interaction of the nozzle with time-dependent axial swirl can also be a source of sound. This axial swirl was generated by intermittent circumferential mass injection upstream from a choked nozzle in a so-called Vortex Wave Generator. The present work discusses the impact of swirl-nozzle interaction in this experiment on the acoustic waves detected downstream of the nozzle. The main source of sound appears to be the reduction in mass flux through the choked nozzle, which depends quadratically on the swirl number. This effect is quantitatively predicted by a quasi-steady and quasi-cylindrical analytical model. The model, combined with empirical data for the decay of axial swirl in pipe flows, predicts the observed influence of the distance between the Vortex Wave Generator and the nozzle. The findings presented here contradict the hypothesis found in the literature, which presumes that sound production in the abovementioned experiment is due to the acceleration of vorticity waves through the nozzle.
elib-URL des Eintrags: | https://elib.dlr.de/136537/ | ||||||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||
Titel: | Sound Production due to Swirl-Nozzle Interaction: Model-Based Analysis of Experiments | ||||||||||||||||
Autoren: |
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Datum: | Juni 2020 | ||||||||||||||||
Erschienen in: | AIAA Aviation 2020 Forum | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Ja | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||
DOI: | 10.2514/6.2020-2532 | ||||||||||||||||
ISBN: | 978-162410598-2 | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | Core Noise, Combustion Noise, Vortex Noise, Swirl-Nozzle-Interaction | ||||||||||||||||
Veranstaltungstitel: | 26th AIAA/CEAS Aeroacoustics Conference / AIAA AVIATION 2020 FORUM | ||||||||||||||||
Veranstaltungsort: | Virtual Event | ||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||
Veranstaltungsbeginn: | 15 Juni 2020 | ||||||||||||||||
Veranstaltungsende: | 19 Juni 2020 | ||||||||||||||||
Veranstalter : | AIAA / CEAS | ||||||||||||||||
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: | 12 Okt 2020 13:16 | ||||||||||||||||
Letzte Änderung: | 24 Apr 2024 20:38 |
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