Tonal Noise Prediction Of Serrated Trailing-Edge Airfoils

Authors

  • Yehia Salama Carleton University
  • Basim Al Tlua
  • Joana Rocha

Keywords:

embedded large eddy simulation, trailing-edge noise, trailing edge serration, airfoil, wind tunnel

Abstract

In this work, Embedded Large Eddy Simulations are employed in tandem with the Ffowcs Williams-Hawkings model to predict the tonal peaks of NACA0012 airfoils having different noise-suppressing trailing-edge configurations. Different non-flat plate sawtooth serration con-figurations are investigated and experimental wind tunnel testing is performed. Results are validated then compared with experimental measurements, and qualitative agreement is obtained in terms of flow statistics and the far-field noise spectra. TE sawtooth serrations are shown to significantly modify the aerodynamics of the wake and improve mixing across the airfoil. Experimental results confirm that sawtooth serrations reduce the broadband noise radiated by the airfoil at the expense of generating a tonal peak, caused by vortex shedding associated with the bluntness of the serration roots. Longer serrations, and higher values of root bluntness are responsible for the strength of the shed vortices and the intensity of the radiated tonal noise. The frequency at which the tonal peaks occur can be controlled for the same serration amplitude and root bluntness by modifying the wavelength. Larger wavelength values for the same serration amplitude and root bluntness lead to higher tonal peak frequencies, and larger values of root bluntness for the same serration amplitude and wavelength lead to lower tonal peak frequencies accompanied by higher peak amplitudes.

Additional Files

Published

2023-07-10

How to Cite

1.
Salama Y, Al Tlua B, Rocha J. Tonal Noise Prediction Of Serrated Trailing-Edge Airfoils. Canadian Acoustics [Internet]. 2023 Jul. 10 [cited 2024 Apr. 28];51(1). Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3449

Issue

Vol. 51 No. 1 (2023)

Section

Article - Aeroacoustics

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