Development and assessment of an inflow control device and a bell-mouth for a low-speed aeroacoustic fan rig

Caldas, Luciano; Oertwig, Sebastian; Rudolphi, Angelo; Meyer, Robert K.; Enghardt, Lars; Tapken, Ulf

doi:10.2514/6.2019-2713

Cited by 3 publications

(8 citation statements)

References 10 publications

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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

View full text Add to dashboard Cite

show abstract

“…In this regard, a new ICD was designed to reduce non-representative noise excitation in future experiments. 26,44 2. A step-like pattern is found in the mode analysis of the tones around two BPF that results from deviations between individual rotor blade wakes.…”

Section: Discussionmentioning

confidence: 99%

“…In this regard, a new ICD was designed to reduce non-representative noise excitation in future experiments. 26,44…”

Section: Discussionmentioning

confidence: 99%

“…Measurements were carried out in the same test rig, however with a different fan. A detailed report of this measurement was published by Oertwig 14 and selected results also by Caldas et al 26 As the inlet Mach numbers measured in that work (approx. 16.5 m/s) are roughly the same as in the current work (18 m/s), average numbers for turbulence quantities shall be used from that measurement campaign.…”

Section: Introductionmentioning

confidence: 97%

“…This may be an indicator for remaining inflow distortions in the flow profile near the outer duct boundary which were not sufficiently equalized by the ICD. 26 Also visible are multiple pure tones above the second and fourth BPF. The third BPF is excited rather weakly.…”

Section: Introductionmentioning

confidence: 99%

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Advanced analysis of fan noise measurements supported by theoretical source models

Klähn

Moreau

Caldas

et al. 2022

International Journal of Aeroacoustics

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With the objective to improve the understanding of the dominant fan noise source mechanisms, a comprehensive experimental study was conducted at a low speed fan test rig. The aerodynamic fan map as well as the acoustic characteristics of the fan was measured for a new blade integrated disk (Blisk) rotor with systematic variation of the shaft speed and throttling. The interpretation of the results is supported by simulations of the experiment with a physics-based analytical in-house tool for fan noise prediction. For the acoustic measurements, an array of wall-flushed microphones was used in the inlet section. By means of radial mode analysis techniques, the broadband and tonal sound powers are calculated for each operating point. In the obtained comprehensive database, systematic variations of the tonal and broadband sound power with the flow rate are found. These patterns can only partly be correlated to the varying incidence angle of the rotor blades. Comparing the mode distributions of the measured noise and the analytical models then allows conclusions on the predominant noise sources of rotor–stator interaction and inflow-rotor interaction.

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Construction and Assessment of an Inflow-Control-Device for a Low-Speed Aeroacoustic Fan Rig

et al. 2022

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Development and assessment of an inflow control device and a bell-mouth for a low-speed aeroacoustic fan rig

Cited by 3 publications

References 10 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

Advanced analysis of fan noise measurements supported by theoretical source models

Construction and Assessment of an Inflow-Control-Device for a Low-Speed Aeroacoustic Fan Rig

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