Far field wall-mounted microphone device for the S1MA anechoic closed-section wind tunnel applied to Open Rotor

Méry, Fabien; Rey, Maxime; Davy, Renaud; Fernando, Rasika

doi:10.2514/6.2012-2228

Cited by 6 publications

(8 citation statements)

References 2 publications

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“…This very little reflection induced a huge variation on the results. In F.Mery et al 1 , a similar phenomena is observed. A simple reflection model can easily give us a pretty good correction.…”

Section: B Calibration Of the Device In An Anechoic Chambersupporting

confidence: 69%

“…A simple reflection model can easily give us a pretty good correction. This model is mainly developed in [1]. Eq.…”

Section: B Calibration Of the Device In An Anechoic Chambermentioning

confidence: 99%

“…This instrumentation is used for the far field acoustic directivity of Open Rotors. This instrumentation has been already presented in [1] In parallel, GMT wants to achieve high speed acoustic measurements without acoustic liner and ensures quality acoustic measurements thanks to dereverberation and denoising methods. This paper presents new measurement devices developped for the high speed measurements.…”

Section: Introductionmentioning

confidence: 99%

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S1MA High Speed Acoustic Measurement Devices for Open Rotor Mock Up

Méry¹

2013

19th AIAA/CEAS Aeroacoustics Conference

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The present paper aims at introducing the new far field and near field acoustic device for high speed acoustic measurement in a closed test section of S1MA for Open Rotor noise measurements. These new devices are based on previous research where metallic cloths (wiremesh) and recessed microphones prevent spurious hydrodynamic fluctuations without disturbing the acoustic measurement. This instrumentation is used for the far field and the near field acoustic directivity of an Open Rotor. In order to assess the acoustic quality of S1MA, qualification in anechoic chamber and acoustic inflow qualification with a reference acoustic source is performed. The methodology for them validation is presented in this paper. NomenclatureM = Mach number ∆M = Mach number deviation X = Abscissa coordinate in the test section D = Acoustic Beam diameter e = Airfoil profile thickness θ m = Measuring angle θ' = Specific emission Angle SPL = Sound pressure level (dB) a = Sound Celerity

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Section: B Calibration Of the Device In An Anechoic Chambersupporting

confidence: 69%

“…A simple reflection model can easily give us a pretty good correction. This model is mainly developed in [1]. Eq.…”

Section: B Calibration Of the Device In An Anechoic Chambermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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S1MA High Speed Acoustic Measurement Devices for Open Rotor Mock Up

Méry¹

2013

19th AIAA/CEAS Aeroacoustics Conference

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“…Furthermore, fan rigs usually support in-duct microphone arrays for unsteady wall-pressure measurements and modal decomposition [11,21]. Additionally, wind tunnel facilities with large test sections have also been used for aeroengine noise tests, which might be useful to assess fan noise from wind-cross, and angle-of-attack configurations, and innovative aeroengine architectures, such as Counter-Rotating Open Rotors (CROR) [4,14,20].…”

Section: Introductionmentioning

confidence: 99%

New modular fan rig for advanced aeroacoustic tests - Acoustic characterization of the facility

Salze

Pereira

Souchotte

et al. 2019

25th AIAA/CEAS Aeroacoustics Conference

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This paper presents the acoustic qualification of the new ECL-B3 test-rig at École Centrale de Lyon in France. This new experimental facility is part of the PHARE project, which is supported by the French National Research Agency through the EquipEx program. The testrig was designed and manufactured together by Safran Aircraft Engines and École Centrale de Lyon for aeroacoustic tests of a reduced-scale fan stage, and can support a wide range of R&D studies using state-of-the-art equipment and instrumentation, such as turbulence control screen, pole rakes, hot-wires, particle image velocimetry, pressure transducers, and internal and external microphone arrays, among others. These will allow for a better understanding of aeroacoustic phenomena in future fan stages, such as the influence of inflow distortion, aerodynamic instabilities due to rotating stall and surge, and noise generation and propagation. Furthermore, the high-speed acquisition system that has been set up in the test facility is suitable for highly instrumented aeroacoustic measurements. For instance, up to 192 microphones can be installed simultaneously. Commissioning tests have been performed using a 20" fan stage designed and manufactured by Safran Aircraft Engines. Preliminary results indicate that this facility can provide state-of-the-art aeroacoustic measurements (low inlet distorsion, low background noise levels, ...), and can be useful for advanced aeroacoustic tests of modular fan stages. Thus, the ECL-B3 facility is suitable for the maturation of noise reduction technologies up to technology readiness level of the order of 3 to 4.

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“…In addition to flow quality, this goal is also pursued due to time and cost motivations. To make progress towards this objective, some effort has been made those last years in order to improve S1MA acoustic capabilities [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

S1MAWind Tunnel New Aeroacoustic Capability: a Traversing Microphone Array

Nicolas¹,

Rey²

2018

2018 AIAA/CEAS Aeroacoustics Conference

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This paper aims at describing the new measurement device installed in S1MA wind tunnel for aeroacoustics tests. We present here the in-situ qualification of a traversing microphone array which equipped the acoustic closed test section of the wind tunnel. First, we show that it allows us to capture very complex directivity patterns thanks to a very good spatial resolution. Secondly, we demonstrate the ability of continuous scans measurements to perform as well as stabilized acquisitions, leading to a major improvement in wind tunnel productivity. Finally, we also take advantage of the microphone array to denoise acquisition data using beamforming processing.

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Far field wall-mounted microphone device for the S1MA anechoic closed-section wind tunnel applied to Open Rotor

Cited by 6 publications

References 2 publications

S1MA High Speed Acoustic Measurement Devices for Open Rotor Mock Up

S1MA High Speed Acoustic Measurement Devices for Open Rotor Mock Up

New modular fan rig for advanced aeroacoustic tests - Acoustic characterization of the facility

S1MAWind Tunnel New Aeroacoustic Capability: a Traversing Microphone Array

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