Dynamics of the Large-Scale Structures and Associated Noise Emission in Airfoil Slats

Souza, Daniel S. and Rodríguez Álvarez, Daniel and Himeno, Fernando H. T. and Medeiros, Marcello A. F. (2019). Dynamics of the Large-Scale Structures and Associated Noise Emission in Airfoil Slats. "Journal of Fluid Mechanics", v. 875 ; pp. 1004-1034. ISSN 0022-1120 | 1469-7645. https://doi.org/10.1017/jfm.2019.496.

Description

Title: Dynamics of the Large-Scale Structures and Associated Noise Emission in Airfoil Slats
Author/s:
  • Souza, Daniel S.
  • Rodríguez Álvarez, Daniel
  • Himeno, Fernando H. T.
  • Medeiros, Marcello A. F.
Item Type: Article
Título de Revista/Publicación: Journal of Fluid Mechanics
Date: 25 September 2019
ISSN: 0022-1120 | 1469-7645
Volume: 875
Subjects:
Freetext Keywords: Aeroacoustics; Hydrodynamic Noise; Low-Dimensional Models
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Matemática Aplicada a la Ingeniería Aeroespacial
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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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.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7247651ICOMASEFUNIVERSIDAD POLITECNICA DE MADRIDInstability and Control of Massively Separated Flows

More information

Item ID: 68119
DC Identifier: https://oa.upm.es/68119/
OAI Identifier: oai:oa.upm.es:68119
DOI: 10.1017/jfm.2019.496
Official URL: https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/dynamics-of-the-largescale-structures-and-associated-noise-emission-in-airfoil-slats/1196960A34DF738FAFDA31433E181705
Deposited by: Memoria Investigacion
Deposited on: 02 Aug 2021 08:32
Last Modified: 05 Oct 2021 15:00
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