Lößle, Felix und Schmid, Rainer und Kostek, Anna und Ernst, Daniel und Schwarz, Clemens und Braukmann, Johannes N. und Wolf, Christian (2024) Experimental Investigation of the Aeroacoustics of Small Rotors in Hover and Forward Flight. In: ODAS 2024. ODAS 2024, 2024-06-12 - 2024-06-14, Braunschweig, Deutschland.
Dieses Archiv kann nicht den Volltext zur Verfügung stellen.
Offizielle URL: https://odas2024.sciencesconf.org/
Kurzfassung
The mechanisms of sound generation of broadband noise of small rotors are investigated for different flight conditions in an experimental study. A novel microphone array with 512 MEMS microphones is used to investigate the sound emission. Beamforming algorithms are applied to localize the sound generation areas of the broadband noise on the rotor blades. Additionally, the optical flow measurement techniques particle image velocimetry and background-oriented schlieren are used to investigate the aerodynamic mechanisms on which the noise is based. The experiments are supplemented by simulations using a panel method. The experiments show that trailing edge noise at 80% of the rotor radius is the dominant sound source mechanism for broadband noise in the frequency range 1 − 8 kHz in hover. In forward flight, the noise emission depends strongly on the flight condition. When the rotor is tilted against the incoming flow (decelerating maneuver), a C-shaped sound source area occurs in the front of the rotor disk, which can be attributed to interactions of blade tip vortices in the rotor wake with the subsequent rotor blades. In addition, two areas of sound generation on the advancing and retreating rotor side are detected when the rotor is tilted backwards by up to 10◦. These are caused by the interaction with the super vortices that form on both sides of the rotor during forward flight.
elib-URL des Eintrags: | https://elib.dlr.de/204910/ | ||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||||||||||||||||||||||
Titel: | Experimental Investigation of the Aeroacoustics of Small Rotors in Hover and Forward Flight | ||||||||||||||||||||||||||||||||
Autoren: |
| ||||||||||||||||||||||||||||||||
Datum: | 13 Juni 2024 | ||||||||||||||||||||||||||||||||
Erschienen in: | ODAS 2024 | ||||||||||||||||||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||
Open Access: | Nein | ||||||||||||||||||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||
In SCOPUS: | Nein | ||||||||||||||||||||||||||||||||
In ISI Web of Science: | Nein | ||||||||||||||||||||||||||||||||
Herausgeber: |
| ||||||||||||||||||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||||||||||||||||||
Stichwörter: | Kleinrotor, small rotor, Breitbandlärm, broadband noise, Mikrofonarray, microphone array, PIV, BOS, UPM | ||||||||||||||||||||||||||||||||
Veranstaltungstitel: | ODAS 2024 | ||||||||||||||||||||||||||||||||
Veranstaltungsort: | Braunschweig, Deutschland | ||||||||||||||||||||||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||||||||||||||||||||||
Veranstaltungsbeginn: | 12 Juni 2024 | ||||||||||||||||||||||||||||||||
Veranstaltungsende: | 14 Juni 2024 | ||||||||||||||||||||||||||||||||
Veranstalter : | ONERA/DLR | ||||||||||||||||||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||||||||||||||||||
HGF - Programmthema: | Luftverkehr und Auswirkungen | ||||||||||||||||||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||||||||||||||||||
DLR - Forschungsgebiet: | L AI - Luftverkehr und Auswirkungen | ||||||||||||||||||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Lufttransportbetrieb und Folgenabschätzung | ||||||||||||||||||||||||||||||||
Standort: | Göttingen | ||||||||||||||||||||||||||||||||
Institute & Einrichtungen: | Institut für Aerodynamik und Strömungstechnik > Hubschrauber, GO Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren, GO | ||||||||||||||||||||||||||||||||
Hinterlegt von: | Koch, Bianca | ||||||||||||||||||||||||||||||||
Hinterlegt am: | 03 Jul 2024 12:13 | ||||||||||||||||||||||||||||||||
Letzte Änderung: | 24 Jul 2024 16:52 |
Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags