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Flow Field Measurements to Characterize Flap Side-Edge Noise Generation

Rossignol, Karl-Stephane (2013) Flow Field Measurements to Characterize Flap Side-Edge Noise Generation. 19th AIAA/CEAS Aeroacoustics Conference, 27.-29. Mai 2013, Berlin, Germany.

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Kurzfassung

n this paper, the relation between noise generated at flap side-edges (FSE) and mean flow characteristics in the vicinity of the FSE solid surface is investigated. Of interest is (1) the identification of mean flow features near the flap tip which are important to FSE noise generation, (2) the extraction of quantitative parameters relating flap settings to the emitted noise levels and, finally, (3) the formulation of a prediction scheme based on these observations. The results of the investigation demonstrate that FSE noise can be properly represented by the summed contributions of two independent source mechanisms. Moreover, this new formulation necessitates only a limited knowledge of the mean flow parameters in the vicinity of the FSE to model the noise emission. It is assumed that unsteady vorticity fluctuations, originating from the unstable pressure side shear layer, sweeping over the forward half of the upper tip edge, lead to midto- high frequency noise production. Flow unsteadiness in the proximity of the suction side surface near the FSE aft half, are assumed to be the main contributor in the low-to-mid frequency range. A prediction scheme is formulated and validated for a wide range of experimental measurements at small scale wing configurations. This new formulation only necessitates knowledge of the flap chord length and lift coefficient to provide accurate estimates of the far field noise radiation.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Flow Field Measurements to Characterize Flap Side-Edge Noise Generation
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Rossignol, Karl-StephaneAS-TA
Datum:Mai 2013
Referierte Publikation:Nein
Status:veröffentlicht
Stichwörter:Airframe noise, experimental aeroacoustics, flap noise, flap side edge noise, empirical modeling
Veranstaltungstitel:19th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Berlin, Germany
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:27.-29. Mai 2013
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Technische Akustik
Hinterlegt von: Karl-Stephane Rossignol
Hinterlegt am:09 Sep 2013 15:51
Letzte Änderung:08 Mai 2014 23:29

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