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Dynamics of the large-scale structures and associated noise emission in airfoil slats

Published online by Cambridge University Press:  26 July 2019

Daniel S. Souza Open the ORCID record for Daniel S. Souza [Opens in a new window] ,
Daniel Rodríguez Open the ORCID record for Daniel Rodríguez [Opens in a new window] ,
Fernando H. T. Himeno  and
Marcello A. F. Medeiros Open the ORCID record for Marcello A. F. Medeiros [Opens in a new window]
Daniel S. Souza*
Affiliation:
Department of Thermal and Fluid Sciences, Federal University of São João del Rei, Praça Frei Orlando, 170, São João del Rei, Brazil Department of Aeronautical Engineering, University of São Paulo, Av. Trabalhador São Carlense, 400, São Carlos, SP 13566-590, Brazil UNESP – São Paulo State University, Campus São João da Boa Vista, São João da Boa Vista, SP 13876-750, Brazil
Daniel Rodríguez
Affiliation:
ETSIAE-UPM (School of Aeronautics), Universidad Politécnica de Madrid, Plaza del Cardenal Cisneros 3, 28040 Madrid, Spain Department of Aeronautical Engineering, University of São Paulo, Av. Trabalhador São Carlense, 400, São Carlos, SP 13566-590, Brazil Mechanical Engineering Department, Universidade Federal Fluminense (UFF), Niteroi, RJ 24210-240, Brazil
Fernando H. T. Himeno
Affiliation:
Department of Aeronautical Engineering, University of São Paulo, Av. Trabalhador São Carlense, 400, São Carlos, SP 13566-590, Brazil
Marcello A. F. Medeiros
Affiliation:
Department of Aeronautical Engineering, University of São Paulo, Av. Trabalhador São Carlense, 400, São Carlos, SP 13566-590, Brazil
*
†Email address for correspondence: daniel.s.souza@unesp.br
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Abstract

We investigate the slat narrowband peak noise generating mechanism. Unsteady flow data were generated by a lattice-Boltzmann-based commercial code for four configurations, accounting for variations of the airfoil angle of attack and slat overlap. Comparison with experimental results indicates that the aspects of the flow field relevant for the generation of the narrowband peaks were accurately captured. Frequency-domain proper orthogonal decomposition (POD) is applied to identify dominant large-scale structures in the frequency range dominated by the peaks. The combined use of the two POD metrics, namely, the turbulent kinetic energy in the turbulent flow region and the acoustic pressure in the far field, demonstrated that the structures most correlated with the noise resemble spanwise coherent Kelvin–Helmholtz vortices which dominate the slat cove only at the frequency of the narrowband peaks. Time evolution of the structures educed using the acoustic pressure correlation provides detailed evidence of the hydrodynamic and acoustic steps of a Rossiter-like feedback mechanism between the slat cusp and trailing edge. The combined analysis of results for the different slat configurations provides an explanation for the effect of the slat configuration on the amplitude of the narrowband peaks observed in previous studies, particularly the influence of the main-element suction peak.

JFM classification

Acoustics: Aeroacoustics Acoustics: Hydrodynamic noise Nonlinear Dynamical Systems: Low-dimensional models
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 875 , 25 September 2019 , pp. 1004 - 1034
Copyright
© 2019 Cambridge University Press 

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Footnotes

‡

Present address: ETSIAE-UPM, Universidad Politécnica de Madrid, Spain

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