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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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Abstract

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.

Document Type:Conference or Workshop Item (Speech)
Title:Flow Field Measurements to Characterize Flap Side-Edge Noise Generation
Authors:
AuthorsInstitution or Email of Authors
Rossignol, Karl-StephaneAS-TA
Date:May 2013
Refereed publication:No
Status:Published
Keywords:Airframe noise, experimental aeroacoustics, flap noise, flap side edge noise, empirical modeling
Event Title:19th AIAA/CEAS Aeroacoustics Conference
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:27.-29. Mai 2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Karl-Stephane Rossignol
Deposited On:09 Sep 2013 15:51
Last Modified:08 May 2014 23:29

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