Prediction of Foward Fan Noise Propagation and Radiation from Intakes

Achunche, Iansteel; Astley, Jeremy; Sugimoto, Rie; Kempton, A. J.

doi:10.2514/6.2009-3239

Cited by 18 publications

(18 citation statements)

References 10 publications

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“…As no informations about radial modes are available from the measurements, each Fourier-Bessel mode amplitude is estimated by using radial mode shape functions at casing position, and assuming an equal energy distribution per mode. 6,13 This point will be detailed in the Sec. III.…”

Section: Engine Test Rig and Acoustic Measurementsmentioning

confidence: 97%

“…Analytical and numerical predictions often suppose uncorrelated modes. 5,6,13 This hypothesis allows to get rid of interference effects that usually disappear during experimental test due to ensemble average realized over a long period of time. Slight variations in test conditions (rotor speed for example) induce change in the phase of the acoustic sources resulting in a decorrelation.…”

Section: Iiic Mode Coherence Cancelingmentioning

confidence: 99%

“…Input data can be obtained from CFD as in 2,3 or from measurements. 4,5 Achunche et al 6 study the radiation from a test rig using FEM (Finite Element Method) considering several modes summed independently. The spinning modes amplitude is determined from experiment.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

Reboul

Polacsek

Billonnet

et al. 2014

20th AIAA/CEAS Aeroacoustics Conference

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The goal of this study was to realize predictions of tonal noise generated by a SNECMA turbofan mock up with a heterogeneous stator and radiated from the inlet using as input a modal decomposition made in the inlet duct wall. A numerical approach based on the CAA (Computational AeroAcoustics) code sAbrinA.V0 with an equivalent source term recently implemented is used as well as an analytical methodology using a Wiener-Hopf technique and an uniform flow assumption. Even if directivities from raw experimental data exhibit significant variations of noise level in the azimuthal direction proving that correlation effect between modes seems to be not negligible for tonal noise, the hypothesis of incoherent modes inducing axisymmetric directivities allow to compare reasonably well with measured data averaged azimuthally. Comparisons between theoretical and numerical predictions confirm the practical interest of using simplified analytical methods even if clear improvement are provided by more complex and time consuming methods like CAA. Especially, for polar angles between 20 • and 70 • , a very good agreement is obtained with a maximum discrepancy of 0.7 dB on overall sound pressure level for the three first tones.

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Section: Engine Test Rig and Acoustic Measurementsmentioning

confidence: 97%

Section: Iiic Mode Coherence Cancelingmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

Reboul

Polacsek

Billonnet

et al. 2014

20th AIAA/CEAS Aeroacoustics Conference

View full text Add to dashboard Cite

show abstract

“…The critical question is whether they can adequately predict far field attenuation for realistic fan sources. This was the subject of a recent study [53] in which predicted and measured far field data were compared for a 1/3 scale fan rig. The FE/IE code ACTRAN/TM [54] running within a Rolls-Royce proprietary shell code Anprorad was used for the predictions.…”

Section: Selecting a Validated Caa Model For Intake Liner Optimisationmentioning

confidence: 99%

A review of CAA for fan duct propagation and radiation, with application to liner optimisation

Astley

Sugimoto

Achunche

et al. 2010

Procedia Engineering

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This article reviews the application of Computational Aero-Acoustics (CAA) to the prediction of acoustic propagation in turbofan ducts. The challenge of resolving the radiated sound field for realistic nacelle geometries is discussed and evidence is presented to indicate that current CAA is able to represent the effect of in-duct liners on far-field measured rig and engine data. Two approaches are presented for incorporating CAA predictions within liner optimisation schemes for a turbofan intake.

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“…Achunche et al, [23] presented a prediction method for fan tone noise propagation and radiation in intake. The results from the predictions are validated against rig measurements.…”

Section: Noise Propagationmentioning

confidence: 99%

Aero-Engines Intake: A Review and Case Study

El-Sayed¹

2016

J Robot Mech Eng Resr

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This paper presents an aerodynamic review for intakes of aero-engines. Classification of different types is introduced for both subsonic and supersonic aircrafts. Important parameters influencing intake performance like pressure recovery and spillage drag are discussed. In addition, crucial performance issues such as the angle of attack, ground vortex, swirl flow, noise propagation and icing are presented. These are critical issues which are carefully considered by airframe rather than engine manufacturers. Intake icing may be extremely dangerous and leads to drastic decrease in air mass flow and consequently aircraft propulsion.Calculation of intake performance is explained. The effect of intake performance on the whole engine performance is highlighted. Numerical analyses for present and previous researches are explained and critical parameters are identified.Finally, a case study resembling the intake of a high bypass ratio turbofan engine (in close similarity to that of GE CF-6 Turbofan Engine) is numerically analysed using the commercial code "ESI-CFD 2010" is thoroughly described and analysed. This paper is the first of a series of research work that will cover several R & D activities in HBPR and future EBPR turbofan intakes.

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Prediction of Foward Fan Noise Propagation and Radiation from Intakes

Cited by 18 publications

References 10 publications

Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

Prediction of BPF tones emitted by the inlet of an aero-engine model using in-duct angular mode spectrum measurements

A review of CAA for fan duct propagation and radiation, with application to liner optimisation

Aero-Engines Intake: A Review and Case Study

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