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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Effect of Bubble Seal on Slat Noise

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Autor(es):
do Amaral, Filipe Ramos [1] ; Tadashi Himeno, Fernando Henrique [1] ; Souza, Daniel Sampaio [2, 3] ; Pagani Junior, Carlos do Carmo [2] ; Faraco de Medeiros, Marcello Augusto [4]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Mech Engn, BR-13566590 Sao Carlos, SP - Brazil
[2] Sao Paulo State Univ, Campus Sao Joao Da Boa Vista, BR-13876750 Sao Joao Da Boa Vista - Brazil
[3] Univ Fed Sao Joao del Rei, Dept Thermal & Fluid Sci, BR-36307352 Sao Joao Del Rei, MG - Brazil
[4] Univ Sao Paulo, Dept Aeronaut Engn, BR-13566590 Sao Carlos, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: AIAA JOURNAL; v. 57, n. 4, p. 1608-1623, APR 2019.
Citações Web of Science: 1
Resumo

This paper reports a study of the sound emitted by a slat of a two-dimensional three-element MD30P30N airfoil, on which a two-dimensional excrescence was installed to represent a sealing device. Experiments were conducted in a closed-test-section wind-tunnel, and a conventional beamforming technique combined with DAMAS deconvolution method was employed for the evaluation of the radiated noise. Nine seal positions along the slat cove wall and six different seal cross sections were tested for 3-9 deg angles of attack and 34 m/s freestream speed. Mean static pressure measurements on the airfoil surface indicated that the seals did not impact the airfoil lift but significantly affected the slat noise signature, particularly the low-frequency narrowband peaks. At some positions, the narrowband peaks were increased up to 18 dB/Hz, whereas for other positions, they were virtually suppressed. At the noisiest position, even a seal whose height was 1.33% of the slat chord strongly affected the slat noise signature. Lattice Boltzmann numerical simulations in combination with the Ffowc Williams-Hawkings analogy were conducted for experimental cases selected and revealed the strong effect of the seal on the mean flow and the turbulence recirculation in the slat cove. (AU)

Processo FAPESP: 16/02970-5 - Estudo computacional do efeito Aeroacústico de um selo localizado na cova do Eslate e análise através de técnica POD
Beneficiário:Fernando Henrique Tadashi Himeno
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 06/52568-7 - Aeronave silenciosa: uma investigação em aeronáutica
Beneficiário:Julio Romano Meneghini
Linha de fomento: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE