Acoustic test facility for aero engine fans

Khaletskiy, Yuri; Mileshin, Victor; Shipov, R. A.

doi:10.1121/1.2933521

Cited by 5 publications

(4 citation statements)

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“…This allows to simulate in-flight noise radiation on static test beds which is much less cost intensive than acoustic characterization in fly-over tests. Since these early studies the use of TCS to simulate in-flight noise radiation under static test conditions was accepted and many test facilities for acoustic investigations of fans or aircraft engines are equipped with such structures ( [17,18,19,20,21,22,23,24]). However, in most of the mentioned studies the influence of the TCS is analyzed only from an acoustic point of view.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Turbulence Control Screen on the Aerodynamic and Aeroelastic Behavior of a UHBR Fan

Schneider

Paoletti

Ottavy

et al. 2022

Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engine

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A composite fan stage representative of a modern Ultra High Bypass Ratio (UHBR) architecture has been investigated experimentally on a novel test facility at Ecole Centrale de Lyon. For these experiments, a turbulence control screen (TCS), a hemisphere, consisting of honeycomb and wiremesh panels, was installed in front of the rig in order to ensure homogeneous, disturbance-free inflow conditions. This kind of screen was developed in the early 1970 years to investigate flight-noise on static test beds. Today, they are commonly used in aero-engine and fan tests, because they improve the accuracy of acoustic measurements and provide more reproducible performance tests. However, the influence of such screens has been investigated only from an acoustic point of view in the past. This study presents a back-to-back comparison of measurements with and without the TCS, which allows a characterization of the effects on aerodynamic and aeroelastic behavior of the fan stage. The investigation was carried out for multiple stable operating points on two different speed lines to obtain a global image of the influence at part and design speed. The utilization of steady and unsteady instrumentation in different axial and circumferential duct positions allows a detailed analysis of similarities and differences of the configuration without and with the TCS and provides insight into underlying physical mechanisms.

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Section: Introductionmentioning

confidence: 99%

Influence of a Turbulence Control Screen on the Aerodynamic and Aeroelastic Behavior of a UHBR Fan

Schneider

Paoletti

Ottavy

et al. 2022

Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engine

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“…In the rotating machinery, this method is often used for vibration and noise spectrum analysis. 37,38 Dong et al 23 successfully identifies the Cavitation Fault of the centrifugal pump by using the octave spectrum analysis method. Therefore, it is feasible to use this method to analyze the vibration and noise spectrum of the marine pump under shaft combined misalignment conditions.…”

Section: Fðωþmentioning

confidence: 99%

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

Wang

Liu

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

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Shaft combined misalignment is the main form of shaft misalignment fault in a marine centrifugal pump. To investigate the influence of shaft misalignment on the vibration and noise of marine centrifugal pumps, a marine pump is experimentally measured under normal condition and shaft combined misalignment condition. In this paper, the frequency domain characteristics of vibration and noise are analyzed by Fast Fourier transform technique. The characteristics of axis orbit, the spectral characteristics of vibration and noise, and the One-Third octave spectral distribution characteristics are also comprehensively compared. Results show that after shaft combined misalignment occurs, the maximum amplitudes of 1APF (axial passing frequency) in the X and Y directions at M1 increase by 35.06% and 24.04%, the maximum amplitudes of 2APF in the X and Y directions at M1 increase by 2.61 times and 2.61 times, and the axis orbit shows a clockwise variation of the “8” shape. As the flow rate decreases, the shape of an “8” of the rotor axis orbit becomes progressively flatter. The maximum Overall vibration velocity level (OAVL) of M2 and M5 decreases by 12.03% and 1.79%, and the maximum OAVL of M3 and M4 increases by 6.52% and 2.27%. The frequency domain amplitude of M6 increases significantly in 1APF and 2APF, and the maximum increases are 12.41% and 2.24% at different flow rates. The overall sound pressure level of M6 increases by 0.42% at 0.6 Qd. These findings indicate the vibration energy of M1-M5 and noise energy of M6 are related to the running condition. The axis orbit of M1 shows the shape of 8, which can significantly judge the misalignment of the shafting. Then, combined with the amplitude variation of 1APF and 2APF of the M2-M6 spectrum, the comprehensive misalignment of shafting can be further judged. The above discoveries provide reference to the diagnosis of shaft combined misalignment fault that occurred for the marine pump.

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“…Finally, the flow exhausts from a row of silencers, which minimize external noise emissions. A comparison of available data from various fan rigs and facilities is shown in Table 1, including the ECL-B3 facility at École Central de Lyon, the C-3A facility at the Central Institute of Aviation Motors (CIAM) [13,18], and the fan rig of AneCom AeroTest (ACAT) [15].…”

Section: A Overview Of the Test-rigmentioning

confidence: 99%

“…Engine manufacturers rely on high-fidelity experimental measurements performed in dedicated facilities for engine testing. To this end, a number of aeroengine fan rigs for aeroacoustic measurements in static test conditions are operated around the world [8,13,15,22]. Most of them present some common characteristics.…”

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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Acoustic test facility for aero engine fans

Cited by 5 publications

References 0 publications

Influence of a Turbulence Control Screen on the Aerodynamic and Aeroelastic Behavior of a UHBR Fan

Influence of a Turbulence Control Screen on the Aerodynamic and Aeroelastic Behavior of a UHBR Fan

Influence of shaft combined misalignment on vibration and noise characteristics in a marine centrifugal pump

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

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