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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Souza, Daniel S. [1, 2, 3] ; Rodriguez, Daniel [1, 4, 5, 6] ; Himeno, Fernando H. T. [1] ; Medeiros, Marcello A. F. [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Dept Aeronaut Engn, Av Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Fed Sao Joao del Rei, Dept Thermal & Fluid Sci, Praca Frei Orlando, Praca Frei Orlando 170, Sao Joao Del Rei - Brazil
[3] UNESP Sao Paulo State Univ, Campus Sao Joao Boa Vista, BR-13876750 Sao Joao Da Boa Vista, SP - Brazil
[4] UPM, Sch Aeronaut, ETSIAE, Plaza Cardenal Cisneros 3, E-28040 Madrid - Spain
[5] Univ Fed Fluminense, Mech Engn Dept, BR-24210240 Niteroi, RJ - Brazil
[6] UPM, ETSIAE, Madrid - Spain
Total Affiliations: 6
Document type: Journal article
Source: JOURNAL OF FLUID MECHANICS; v. 875, p. 1004-1034, SEP 25 2019.
Web of Science Citations: 0
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. (AU)

FAPESP's process: 16/02970-5 - Computational study of aeroacoustic effect of a seal located on slat cove and analysis by POD technique
Grantee:Fernando Henrique Tadashi Himeno
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 18/02542-9 - Numerical study of wave packets over a flat plate with roughness
Grantee:Fernando Henrique Tadashi Himeno
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 06/52568-7 - Silent aircraft: a research on aeronautics
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Partnership for Technological Innovation - PITE