Trailing edge serrations

Effect of their flap angle on flow and acoustics

Conference paper (2017)

Authors

C.A. Arce Leon LM Wind Power R&D
R. Merino Martinez Aircraft Noise and Climate Effects - Aerospace Engineering
D. Ragni Wind Energy - Aerospace Engineering
S. Pröbsting Wind Energy - Aerospace Engineering
F. Avallone Wind Energy - Aerospace Engineering
Amanpreet Singh LM Wind Power
Jesper Madsen LM Wind Power
Research Group
Aircraft Noise and Climate Effects (Aerospace Engineering) (TU Delft)
Copyright: © 2017 C.A. Arce Leon, R. Merino Martinez, D. Ragni, S. Pröbsting, F. Avallone, A. Singh, Jesper Madsen
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Published Date

2017

Language

English

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Faculty

Aerospace Engineering

Department

Control & Operations

Research Group

Aircraft Noise and Climate Effects

Abstract

Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed