Baseline Acoustic Levels of the EESC-USP Fan Rig

Martinez, Bernardo D.; Greco, Paulo; Caldas, Luciano; Baccalá, Luiz Antonio; Cuenca, Rafael G.; Queiroz, Rudner

doi:10.2514/6.2017-3384

Cited by 1 publication

(2 citation statements)

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“…13 It is composed of modular sections which allow parametric studies in order to better investigate isolated fan noise sources. 12 The fan stage is a scaled-down replica of the Advanced Noise Control Fan (ANCF) located at the University of Notre Dame, Turbomachinery Laboratory. (The ANCF was originally developed by NASA Glenn Research Center and it was located at the Aeroacoustic Propulsion Laboratory until 2016.)…”

Section: Eesc-usp Fan Noise Test Rigmentioning

confidence: 99%

“…It contains a scaled-down replica of a representative fan-OGV section to investigate fan noise generation in parametric studies. 12 The liner is designed to target the first BPF and upstream acoustic propagation, which corresponds to the inlet section of a turbofan engine. To achieve this goal, the dominant modes are first determined by the Tyler-Sofrin rule, and the corresponding optimal impedance is obtained by Cremer's method.…”

Section: Introductionmentioning

confidence: 99%

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Design of a single degree of freedom acoustic liner for a fan noise test rig

Spillere

Braga

Seki

et al. 2021

International Journal of Aeroacoustics

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Acoustic liners are an essential part of noise reduction technologies commonly applied in aircraft turbofan engines. Fan noise suppression can be achieved by selecting an appropriate liner design with optimal acoustic impedance at the blade passing frequency. Great efforts have been made not only to improve experimental characterization and numerical methods for acoustic liners, but also to understand noise generation mechanisms, which ultimately impacts on the liner design itself. To gain confidence in the liner design process, a liner barrel was developed and fabricated for the Fan Noise Test Rig located at the University of São Paulo. To this end, analytical methods were used to determine the optimal acoustic impedance for the Fan Noise Test Rig, and a flat test sample was fabricated for experimental characterization with flow using both in-situ and impedance eduction techniques at the Federal University of Santa Catarina. A liner barrel of same nominal geometry was fabricated and placed at the Fan Noise Test Rig, and a modal decomposition indicated that the Tyler-Sofrin mode has been successfully suppressed at the first blade passing frequency. Numerical predictions of liner transmission loss considering the flat sample impedance showed good agreement with experimental results.

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Section: Eesc-usp Fan Noise Test Rigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%